Merge #5724

5724: Rename ra_prof -> profile
 r=matklad a=matklad

bors r+
🤖

Co-authored-by: Aleksey Kladov <[email protected]>

77 files changed, 162 insertions, 196 deletions

diff --git a/crates/ra_arena/Cargo.toml b/crates/arena/Cargo.toml
index 66c3738f4..f2bb5cc45 100644
--- a/crates/ra_arena/Cargo.toml
+++ b/crates/arena/Cargo.toml
@@ -1,9 +1,9 @@
 [package]
-edition = "2018"
-name = "ra_arena"
-version = "0.1.0"
-authors = ["rust-analyzer developers"]
+name = "arena"
+version = "0.0.0"
 license = "MIT OR Apache-2.0"
+authors = ["rust-analyzer developers"]
+edition = "2018"
 
 [lib]
 doctest = false
diff --git a/crates/ra_arena/src/lib.rs b/crates/arena/src/lib.rs
index 3169aa5b8..3169aa5b8 100644
--- a/crates/ra_arena/src/lib.rs
+++ b/crates/arena/src/lib.rs
diff --git a/crates/ra_arena/src/map.rs b/crates/arena/src/map.rs
index 0f33907c0..0f33907c0 100644
--- a/crates/ra_arena/src/map.rs
+++ b/crates/arena/src/map.rs
diff --git a/crates/ra_prof/Cargo.toml b/crates/profile/Cargo.toml
index c82b9f76d..e271e3a56 100644
--- a/crates/ra_prof/Cargo.toml
+++ b/crates/profile/Cargo.toml
@@ -1,20 +1,20 @@
 [package]
-edition = "2018"
-name = "ra_prof"
-version = "0.1.0"
-authors = ["rust-analyzer developers"]
-publish = false
+name = "profile"
+version = "0.0.0"
 license = "MIT OR Apache-2.0"
+authors = ["rust-analyzer developers"]
+edition = "2018"
 
 [lib]
 doctest = false
 
 [dependencies]
-ra_arena = { path = "../ra_arena" }
 once_cell = "1.3.1"
-backtrace = { version = "0.3.44", optional = true }
 cfg-if = "0.1.10"
 libc = "0.2.73"
+backtrace = { version = "0.3.44", optional = true }
+
+arena = { path = "../arena" }
 
 [target.'cfg(target_os = "linux")'.dependencies]
 perf-event = "0.4"
diff --git a/crates/ra_prof/src/google_cpu_profiler.rs b/crates/profile/src/google_cpu_profiler.rs
index db865c65b..db865c65b 100644
--- a/crates/ra_prof/src/google_cpu_profiler.rs
+++ b/crates/profile/src/google_cpu_profiler.rs
diff --git a/crates/ra_prof/src/hprof.rs b/crates/profile/src/hprof.rs
index a3f5321fb..934cc8e37 100644
--- a/crates/ra_prof/src/hprof.rs
+++ b/crates/profile/src/hprof.rs
@@ -37,19 +37,16 @@ pub type Label = &'static str;
 ///
 /// # Example
 /// ```
-/// use ra_prof::{profile, set_filter, Filter};
-///
-/// let f = Filter::from_spec("profile1|profile2@2");
-/// set_filter(f);
+/// profile::init_from("profile1|profile2@2");
 /// profiling_function1();
 ///
 /// fn profiling_function1() {
-///     let _p = profile("profile1");
+///     let _p = profile::span("profile1");
 ///     profiling_function2();
 /// }
 ///
 /// fn profiling_function2() {
-///     let _p = profile("profile2");
+///     let _p = profile::span("profile2");
 /// }
 /// ```
 /// This will print in the stderr the following:
@@ -57,27 +54,27 @@ pub type Label = &'static str;
 ///  0ms - profile
 ///      0ms - profile2
 /// ```
-pub fn profile(label: Label) -> Profiler {
+pub fn span(label: Label) -> ProfileSpan {
     assert!(!label.is_empty());
 
     if PROFILING_ENABLED.load(Ordering::Relaxed)
         && PROFILE_STACK.with(|stack| stack.borrow_mut().push(label))
     {
-        Profiler(Some(ProfilerImpl { label, detail: None }))
+        ProfileSpan(Some(ProfilerImpl { label, detail: None }))
     } else {
-        Profiler(None)
+        ProfileSpan(None)
     }
 }
 
-pub struct Profiler(Option<ProfilerImpl>);
+pub struct ProfileSpan(Option<ProfilerImpl>);
 
 struct ProfilerImpl {
     label: Label,
     detail: Option<String>,
 }
 
-impl Profiler {
-    pub fn detail(mut self, detail: impl FnOnce() -> String) -> Profiler {
+impl ProfileSpan {
+    pub fn detail(mut self, detail: impl FnOnce() -> String) -> ProfileSpan {
         if let Some(profiler) = &mut self.0 {
             profiler.detail = Some(detail())
         }
diff --git a/crates/ra_prof/src/lib.rs b/crates/profile/src/lib.rs
index eb50965ae..ab19271c7 100644
--- a/crates/ra_prof/src/lib.rs
+++ b/crates/profile/src/lib.rs
@@ -10,7 +10,7 @@ mod tree;
 use std::cell::RefCell;
 
 pub use crate::{
-    hprof::{init, init_from, profile},
+    hprof::{init, init_from, span},
     memory_usage::{Bytes, MemoryUsage},
     stop_watch::{StopWatch, StopWatchSpan},
 };
@@ -25,7 +25,7 @@ pub fn print_backtrace() {
 pub fn print_backtrace() {
     eprintln!(
         r#"enable the backtrace feature:
-    ra_prof = {{ path = "../ra_prof", features = [ "backtrace"] }}
+    profile = {{ path = "../profile", features = [ "backtrace"] }}
 "#
     );
 }
@@ -76,12 +76,12 @@ impl Drop for Scope {
 ///
 /// https://github.com/rust-analyzer/rust-analyzer/pull/5306
 #[derive(Debug)]
-pub struct CpuProfiler {
+pub struct CpuSpan {
     _private: (),
 }
 
 #[must_use]
-pub fn cpu_profiler() -> CpuProfiler {
+pub fn cpu_span() -> CpuSpan {
     #[cfg(feature = "cpu_profiler")]
     {
         google_cpu_profiler::start("./out.profile".as_ref())
@@ -92,10 +92,10 @@ pub fn cpu_profiler() -> CpuProfiler {
         eprintln!("cpu_profiler feature is disabled")
     }
 
-    CpuProfiler { _private: () }
+    CpuSpan { _private: () }
 }
 
-impl Drop for CpuProfiler {
+impl Drop for CpuSpan {
     fn drop(&mut self) {
         #[cfg(feature = "cpu_profiler")]
         {
diff --git a/crates/ra_prof/src/memory_usage.rs b/crates/profile/src/memory_usage.rs
index 83390212a..83390212a 100644
--- a/crates/ra_prof/src/memory_usage.rs
+++ b/crates/profile/src/memory_usage.rs
diff --git a/crates/ra_prof/src/stop_watch.rs b/crates/profile/src/stop_watch.rs
index 5e276190e..5e276190e 100644
--- a/crates/ra_prof/src/stop_watch.rs
+++ b/crates/profile/src/stop_watch.rs
diff --git a/crates/ra_prof/src/tree.rs b/crates/profile/src/tree.rs
index 9ea5b5db8..096f58511 100644
--- a/crates/ra_prof/src/tree.rs
+++ b/crates/profile/src/tree.rs
@@ -1,7 +1,7 @@
 //! A simple tree implementation which tries to not allocate all over the place.
 use std::ops;
 
-use ra_arena::Arena;
+use arena::Arena;
 
 #[derive(Default)]
 pub struct Tree<T> {
@@ -9,7 +9,7 @@ pub struct Tree<T> {
     current_path: Vec<(Idx<T>, Option<Idx<T>>)>,
 }
 
-pub type Idx<T> = ra_arena::Idx<Node<T>>;
+pub type Idx<T> = arena::Idx<Node<T>>;
 
 impl<T> Tree<T> {
     pub fn start(&mut self)
diff --git a/crates/ra_assists/Cargo.toml b/crates/ra_assists/Cargo.toml
index bd2905f08..6f5ace941 100644
--- a/crates/ra_assists/Cargo.toml
+++ b/crates/ra_assists/Cargo.toml
@@ -18,7 +18,7 @@ stdx = { path = "../stdx" }
 ra_syntax = { path = "../ra_syntax" }
 ra_text_edit = { path = "../ra_text_edit" }
 ra_fmt = { path = "../ra_fmt" }
-ra_prof = { path = "../ra_prof" }
+profile = { path = "../profile" }
 ra_db = { path = "../ra_db" }
 ra_ide_db = { path = "../ra_ide_db" }
 hir = { path = "../ra_hir", package = "ra_hir" }
diff --git a/crates/ra_assists/src/handlers/add_missing_impl_members.rs b/crates/ra_assists/src/handlers/add_missing_impl_members.rs
index 95a750aee..dd1406228 100644
--- a/crates/ra_assists/src/handlers/add_missing_impl_members.rs
+++ b/crates/ra_assists/src/handlers/add_missing_impl_members.rs
@@ -110,7 +110,7 @@ fn add_missing_impl_members_inner(
     assist_id: &'static str,
     label: &'static str,
 ) -> Option<()> {
-    let _p = ra_prof::profile("add_missing_impl_members_inner");
+    let _p = profile::span("add_missing_impl_members_inner");
     let impl_def = ctx.find_node_at_offset::<ast::Impl>()?;
     let impl_item_list = impl_def.assoc_item_list()?;
 
diff --git a/crates/ra_assists/src/handlers/auto_import.rs b/crates/ra_assists/src/handlers/auto_import.rs
index 01e7b7a44..6ec59ec4d 100644
--- a/crates/ra_assists/src/handlers/auto_import.rs
+++ b/crates/ra_assists/src/handlers/auto_import.rs
@@ -6,7 +6,6 @@ use hir::{
     Type,
 };
 use ra_ide_db::{imports_locator, RootDatabase};
-use ra_prof::profile;
 use ra_syntax::{
     ast::{self, AstNode},
     SyntaxNode,
@@ -130,7 +129,7 @@ impl AutoImportAssets {
     }
 
     fn search_for_imports(&self, ctx: &AssistContext) -> BTreeSet<ModPath> {
-        let _p = profile("auto_import::search_for_imports");
+        let _p = profile::span("auto_import::search_for_imports");
         let db = ctx.db();
         let current_crate = self.module_with_name_to_import.krate();
         imports_locator::find_imports(&ctx.sema, current_crate, &self.get_search_query())
diff --git a/crates/ra_db/Cargo.toml b/crates/ra_db/Cargo.toml
index fe73dc015..9cb9ba11c 100644
--- a/crates/ra_db/Cargo.toml
+++ b/crates/ra_db/Cargo.toml
@@ -14,7 +14,7 @@ rustc-hash = "1.1.0"
 
 ra_syntax = { path = "../ra_syntax" }
 ra_cfg = { path = "../ra_cfg" }
-ra_prof = { path = "../ra_prof" }
+profile = { path = "../profile" }
 ra_tt = { path = "../ra_tt" }
 test_utils = { path = "../test_utils" }
 vfs = { path = "../vfs" }
diff --git a/crates/ra_db/src/lib.rs b/crates/ra_db/src/lib.rs
index f25be24fe..795d7d2b6 100644
--- a/crates/ra_db/src/lib.rs
+++ b/crates/ra_db/src/lib.rs
@@ -5,7 +5,6 @@ pub mod fixture;
 
 use std::{panic, sync::Arc};
 
-use ra_prof::profile;
 use ra_syntax::{ast, Parse, SourceFile, TextRange, TextSize};
 use rustc_hash::FxHashSet;
 
@@ -113,7 +112,7 @@ pub trait SourceDatabase: CheckCanceled + FileLoader + std::fmt::Debug {
 }
 
 fn parse_query(db: &dyn SourceDatabase, file_id: FileId) -> Parse<ast::SourceFile> {
-    let _p = profile("parse_query").detail(|| format!("{:?}", file_id));
+    let _p = profile::span("parse_query").detail(|| format!("{:?}", file_id));
     let text = db.file_text(file_id);
     SourceFile::parse(&*text)
 }
diff --git a/crates/ra_hir/Cargo.toml b/crates/ra_hir/Cargo.toml
index c260bb193..903406e84 100644
--- a/crates/ra_hir/Cargo.toml
+++ b/crates/ra_hir/Cargo.toml
@@ -19,7 +19,7 @@ itertools = "0.9.0"
 stdx = { path = "../stdx" }
 ra_syntax = { path = "../ra_syntax" }
 ra_db = { path = "../ra_db" }
-ra_prof = { path = "../ra_prof" }
+profile = { path = "../profile" }
 hir_expand = { path = "../ra_hir_expand", package = "ra_hir_expand" }
 hir_def = { path = "../ra_hir_def", package = "ra_hir_def" }
 hir_ty = { path = "../ra_hir_ty", package = "ra_hir_ty" }
diff --git a/crates/ra_hir/src/code_model.rs b/crates/ra_hir/src/code_model.rs
index 0007d7fa8..5c0c6184a 100644
--- a/crates/ra_hir/src/code_model.rs
+++ b/crates/ra_hir/src/code_model.rs
@@ -31,7 +31,6 @@ use hir_ty::{
     InEnvironment, Substs, TraitEnvironment, Ty, TyDefId, TypeCtor,
 };
 use ra_db::{CrateId, Edition, FileId};
-use ra_prof::profile;
 use ra_syntax::{
     ast::{self, AttrsOwner, NameOwner},
     AstNode,
@@ -304,7 +303,7 @@ impl Module {
     }
 
     pub fn diagnostics(self, db: &dyn HirDatabase, sink: &mut DiagnosticSink) {
-        let _p = profile("Module::diagnostics");
+        let _p = profile::span("Module::diagnostics");
         let crate_def_map = db.crate_def_map(self.id.krate);
         crate_def_map.add_diagnostics(db.upcast(), self.id.local_id, sink);
         for decl in self.declarations(db) {
diff --git a/crates/ra_hir/src/semantics.rs b/crates/ra_hir/src/semantics.rs
index 36b688ccb..7e3ec6315 100644
--- a/crates/ra_hir/src/semantics.rs
+++ b/crates/ra_hir/src/semantics.rs
@@ -12,7 +12,6 @@ use hir_expand::{hygiene::Hygiene, name::AsName, ExpansionInfo};
 use hir_ty::associated_type_shorthand_candidates;
 use itertools::Itertools;
 use ra_db::{FileId, FileRange};
-use ra_prof::profile;
 use ra_syntax::{
     algo::{find_node_at_offset, skip_trivia_token},
     ast, AstNode, Direction, SyntaxNode, SyntaxToken, TextRange, TextSize,
@@ -334,7 +333,7 @@ impl<'db> SemanticsImpl<'db> {
     }
 
     fn descend_into_macros(&self, token: SyntaxToken) -> SyntaxToken {
-        let _p = profile("descend_into_macros");
+        let _p = profile::span("descend_into_macros");
         let parent = token.parent();
         let parent = self.find_file(parent);
         let sa = self.analyze2(parent.as_ref(), None);
@@ -523,7 +522,7 @@ impl<'db> SemanticsImpl<'db> {
     }
 
     fn analyze2(&self, src: InFile<&SyntaxNode>, offset: Option<TextSize>) -> SourceAnalyzer {
-        let _p = profile("Semantics::analyze2");
+        let _p = profile::span("Semantics::analyze2");
 
         let container = match self.with_ctx(|ctx| ctx.find_container(src)) {
             Some(it) => it,
diff --git a/crates/ra_hir/src/semantics/source_to_def.rs b/crates/ra_hir/src/semantics/source_to_def.rs
index 863e8e5ff..a6ff8b0bf 100644
--- a/crates/ra_hir/src/semantics/source_to_def.rs
+++ b/crates/ra_hir/src/semantics/source_to_def.rs
@@ -10,7 +10,6 @@ use hir_def::{
 };
 use hir_expand::{name::AsName, AstId, MacroDefKind};
 use ra_db::FileId;
-use ra_prof::profile;
 use ra_syntax::{
     ast::{self, NameOwner},
     match_ast, AstNode, SyntaxNode,
@@ -29,7 +28,7 @@ pub(super) struct SourceToDefCtx<'a, 'b> {
 
 impl SourceToDefCtx<'_, '_> {
     pub(super) fn file_to_def(&mut self, file: FileId) -> Option<ModuleId> {
-        let _p = profile("SourceBinder::to_module_def");
+        let _p = profile::span("SourceBinder::to_module_def");
         let (krate, local_id) = self.db.relevant_crates(file).iter().find_map(|&crate_id| {
             let crate_def_map = self.db.crate_def_map(crate_id);
             let local_id = crate_def_map.modules_for_file(file).next()?;
@@ -39,7 +38,7 @@ impl SourceToDefCtx<'_, '_> {
     }
 
     pub(super) fn module_to_def(&mut self, src: InFile<ast::Module>) -> Option<ModuleId> {
-        let _p = profile("module_to_def");
+        let _p = profile::span("module_to_def");
         let parent_declaration = src
             .as_ref()
             .map(|it| it.syntax())
diff --git a/crates/ra_hir_def/Cargo.toml b/crates/ra_hir_def/Cargo.toml
index d96a86b80..adfd8c7b7 100644
--- a/crates/ra_hir_def/Cargo.toml
+++ b/crates/ra_hir_def/Cargo.toml
@@ -22,10 +22,10 @@ smallvec = "1.4.0"
 
 stdx = { path = "../stdx" }
 
-ra_arena = { path = "../ra_arena" }
+arena = { path = "../arena" }
 ra_db = { path = "../ra_db" }
 ra_syntax = { path = "../ra_syntax" }
-ra_prof = { path = "../ra_prof" }
+profile = { path = "../profile" }
 hir_expand = { path = "../ra_hir_expand", package = "ra_hir_expand" }
 test_utils = { path = "../test_utils" }
 mbe = { path = "../ra_mbe", package = "ra_mbe" }
diff --git a/crates/ra_hir_def/src/adt.rs b/crates/ra_hir_def/src/adt.rs
index 35c3a9140..896a69ca8 100644
--- a/crates/ra_hir_def/src/adt.rs
+++ b/crates/ra_hir_def/src/adt.rs
@@ -2,12 +2,12 @@
 
 use std::sync::Arc;
 
+use arena::{map::ArenaMap, Arena};
 use either::Either;
 use hir_expand::{
     name::{AsName, Name},
     InFile,
 };
-use ra_arena::{map::ArenaMap, Arena};
 use ra_syntax::ast::{self, NameOwner, VisibilityOwner};
 use tt::{Delimiter, DelimiterKind, Leaf, Subtree, TokenTree};
 
diff --git a/crates/ra_hir_def/src/body.rs b/crates/ra_hir_def/src/body.rs
index d5f18b920..1deb1a837 100644
--- a/crates/ra_hir_def/src/body.rs
+++ b/crates/ra_hir_def/src/body.rs
@@ -5,13 +5,12 @@ pub mod scope;
 
 use std::{mem, ops::Index, sync::Arc};
 
+use arena::{map::ArenaMap, Arena};
 use drop_bomb::DropBomb;
 use either::Either;
 use hir_expand::{ast_id_map::AstIdMap, hygiene::Hygiene, AstId, HirFileId, InFile, MacroDefId};
-use ra_arena::{map::ArenaMap, Arena};
 use ra_cfg::CfgOptions;
 use ra_db::CrateId;
-use ra_prof::profile;
 use ra_syntax::{ast, AstNode, AstPtr};
 use rustc_hash::FxHashMap;
 use test_utils::mark;
@@ -228,7 +227,7 @@ impl Body {
         db: &dyn DefDatabase,
         def: DefWithBodyId,
     ) -> (Arc<Body>, Arc<BodySourceMap>) {
-        let _p = profile("body_with_source_map_query");
+        let _p = profile::span("body_with_source_map_query");
         let mut params = None;
 
         let (file_id, module, body) = match def {
diff --git a/crates/ra_hir_def/src/body/lower.rs b/crates/ra_hir_def/src/body/lower.rs
index f5c37edb3..482393006 100644
--- a/crates/ra_hir_def/src/body/lower.rs
+++ b/crates/ra_hir_def/src/body/lower.rs
@@ -3,13 +3,13 @@
 
 use std::{any::type_name, sync::Arc};
 
+use arena::Arena;
 use either::Either;
 use hir_expand::{
     hygiene::Hygiene,
     name::{name, AsName, Name},
     HirFileId, MacroDefId, MacroDefKind,
 };
-use ra_arena::Arena;
 use ra_syntax::{
     ast::{
         self, ArgListOwner, ArrayExprKind, AstChildren, LiteralKind, LoopBodyOwner, NameOwner,
diff --git a/crates/ra_hir_def/src/body/scope.rs b/crates/ra_hir_def/src/body/scope.rs
index 99e876683..f783e18b5 100644
--- a/crates/ra_hir_def/src/body/scope.rs
+++ b/crates/ra_hir_def/src/body/scope.rs
@@ -1,8 +1,8 @@
 //! Name resolution for expressions.
 use std::sync::Arc;
 
+use arena::{Arena, Idx};
 use hir_expand::name::Name;
-use ra_arena::{Arena, Idx};
 use rustc_hash::FxHashMap;
 
 use crate::{
diff --git a/crates/ra_hir_def/src/data.rs b/crates/ra_hir_def/src/data.rs
index 88a8ef9bf..758c12f33 100644
--- a/crates/ra_hir_def/src/data.rs
+++ b/crates/ra_hir_def/src/data.rs
@@ -3,7 +3,6 @@
 use std::sync::Arc;
 
 use hir_expand::{name::Name, InFile};
-use ra_prof::profile;
 use ra_syntax::ast;
 
 use crate::{
@@ -133,7 +132,7 @@ pub struct ImplData {
 
 impl ImplData {
     pub(crate) fn impl_data_query(db: &dyn DefDatabase, id: ImplId) -> Arc<ImplData> {
-        let _p = profile("impl_data_query");
+        let _p = profile::span("impl_data_query");
         let impl_loc = id.lookup(db);
 
         let item_tree = db.item_tree(impl_loc.id.file_id);
diff --git a/crates/ra_hir_def/src/db.rs b/crates/ra_hir_def/src/db.rs
index 9c3ede2d7..1dd4197f8 100644
--- a/crates/ra_hir_def/src/db.rs
+++ b/crates/ra_hir_def/src/db.rs
@@ -3,7 +3,6 @@ use std::sync::Arc;
 
 use hir_expand::{db::AstDatabase, HirFileId};
 use ra_db::{salsa, CrateId, SourceDatabase, Upcast};
-use ra_prof::profile;
 use ra_syntax::SmolStr;
 
 use crate::{
@@ -116,6 +115,6 @@ pub trait DefDatabase: InternDatabase + AstDatabase + Upcast<dyn AstDatabase> {
 }
 
 fn crate_def_map_wait(db: &impl DefDatabase, krate: CrateId) -> Arc<CrateDefMap> {
-    let _p = profile("crate_def_map:wait");
+    let _p = profile::span("crate_def_map:wait");
     db.crate_def_map_query(krate)
 }
diff --git a/crates/ra_hir_def/src/expr.rs b/crates/ra_hir_def/src/expr.rs
index e41cfc16b..befe41c2a 100644
--- a/crates/ra_hir_def/src/expr.rs
+++ b/crates/ra_hir_def/src/expr.rs
@@ -12,8 +12,8 @@
 //!
 //! See also a neighboring `body` module.
 
+use arena::{Idx, RawId};
 use hir_expand::name::Name;
-use ra_arena::{Idx, RawId};
 use ra_syntax::ast::RangeOp;
 
 use crate::{
diff --git a/crates/ra_hir_def/src/find_path.rs b/crates/ra_hir_def/src/find_path.rs
index 06701a830..46e70eb48 100644
--- a/crates/ra_hir_def/src/find_path.rs
+++ b/crates/ra_hir_def/src/find_path.rs
@@ -1,7 +1,6 @@
 //! An algorithm to find a path to refer to a certain item.
 
 use hir_expand::name::{known, AsName, Name};
-use ra_prof::profile;
 use rustc_hash::FxHashSet;
 use test_utils::mark;
 
@@ -18,7 +17,7 @@ use crate::{
 /// Find a path that can be used to refer to a certain item. This can depend on
 /// *from where* you're referring to the item, hence the `from` parameter.
 pub fn find_path(db: &dyn DefDatabase, item: ItemInNs, from: ModuleId) -> Option<ModPath> {
-    let _p = profile("find_path");
+    let _p = profile::span("find_path");
     find_path_inner(db, item, from, MAX_PATH_LEN)
 }
 
@@ -215,7 +214,7 @@ fn find_local_import_locations(
     item: ItemInNs,
     from: ModuleId,
 ) -> Vec<(ModuleId, Name)> {
-    let _p = profile("find_local_import_locations");
+    let _p = profile::span("find_local_import_locations");
 
     // `from` can import anything below `from` with visibility of at least `from`, and anything
     // above `from` with any visibility. That means we do not need to descend into private siblings
diff --git a/crates/ra_hir_def/src/generics.rs b/crates/ra_hir_def/src/generics.rs
index 699ba9c92..0e06a0b12 100644
--- a/crates/ra_hir_def/src/generics.rs
+++ b/crates/ra_hir_def/src/generics.rs
@@ -4,14 +4,13 @@
 //! in rustc.
 use std::sync::Arc;
 
+use arena::{map::ArenaMap, Arena};
 use either::Either;
 use hir_expand::{
     name::{name, AsName, Name},
     InFile,
 };
-use ra_arena::{map::ArenaMap, Arena};
 use ra_db::FileId;
-use ra_prof::profile;
 use ra_syntax::ast::{self, GenericParamsOwner, NameOwner, TypeBoundsOwner};
 
 use crate::{
@@ -73,7 +72,7 @@ impl GenericParams {
         db: &dyn DefDatabase,
         def: GenericDefId,
     ) -> Arc<GenericParams> {
-        let _p = profile("generic_params_query");
+        let _p = profile::span("generic_params_query");
 
         let generics = match def {
             GenericDefId::FunctionId(id) => {
diff --git a/crates/ra_hir_def/src/import_map.rs b/crates/ra_hir_def/src/import_map.rs
index 9e4c30b1a..3a9eec887 100644
--- a/crates/ra_hir_def/src/import_map.rs
+++ b/crates/ra_hir_def/src/import_map.rs
@@ -56,7 +56,7 @@ pub struct ImportMap {
 
 impl ImportMap {
     pub fn import_map_query(db: &dyn DefDatabase, krate: CrateId) -> Arc<Self> {
-        let _p = ra_prof::profile("import_map_query");
+        let _p = profile::span("import_map_query");
         let def_map = db.crate_def_map(krate);
         let mut import_map = Self::default();
 
@@ -254,7 +254,7 @@ pub fn search_dependencies<'a>(
     krate: CrateId,
     query: Query,
 ) -> Vec<ItemInNs> {
-    let _p = ra_prof::profile("search_dependencies").detail(|| format!("{:?}", query));
+    let _p = profile::span("search_dependencies").detail(|| format!("{:?}", query));
 
     let graph = db.crate_graph();
     let import_maps: Vec<_> =
diff --git a/crates/ra_hir_def/src/item_tree.rs b/crates/ra_hir_def/src/item_tree.rs
index a67e75dac..104966c7f 100644
--- a/crates/ra_hir_def/src/item_tree.rs
+++ b/crates/ra_hir_def/src/item_tree.rs
@@ -13,6 +13,7 @@ use std::{
     sync::Arc,
 };
 
+use arena::{Arena, Idx, RawId};
 use ast::{AstNode, AttrsOwner, NameOwner, StructKind};
 use either::Either;
 use hir_expand::{
@@ -21,7 +22,6 @@ use hir_expand::{
     name::{name, AsName, Name},
     HirFileId, InFile,
 };
-use ra_arena::{Arena, Idx, RawId};
 use ra_syntax::{ast, match_ast};
 use rustc_hash::FxHashMap;
 use smallvec::SmallVec;
@@ -77,7 +77,7 @@ pub struct ItemTree {
 
 impl ItemTree {
     pub fn item_tree_query(db: &dyn DefDatabase, file_id: HirFileId) -> Arc<ItemTree> {
-        let _p = ra_prof::profile("item_tree_query").detail(|| format!("{:?}", file_id));
+        let _p = profile::span("item_tree_query").detail(|| format!("{:?}", file_id));
         let syntax = if let Some(node) = db.parse_or_expand(file_id) {
             node
         } else {
diff --git a/crates/ra_hir_def/src/item_tree/lower.rs b/crates/ra_hir_def/src/item_tree/lower.rs
index 450ef8798..4523d0fbb 100644
--- a/crates/ra_hir_def/src/item_tree/lower.rs
+++ b/crates/ra_hir_def/src/item_tree/lower.rs
@@ -2,8 +2,8 @@
 
 use std::{collections::hash_map::Entry, mem, sync::Arc};
 
+use arena::map::ArenaMap;
 use hir_expand::{ast_id_map::AstIdMap, hygiene::Hygiene, HirFileId};
-use ra_arena::map::ArenaMap;
 use ra_syntax::{
     ast::{self, ModuleItemOwner},
     SyntaxNode,
diff --git a/crates/ra_hir_def/src/lang_item.rs b/crates/ra_hir_def/src/lang_item.rs
index 3516784b8..3631499bf 100644
--- a/crates/ra_hir_def/src/lang_item.rs
+++ b/crates/ra_hir_def/src/lang_item.rs
@@ -4,7 +4,6 @@
 //! features, such as Fn family of traits.
 use std::sync::Arc;
 
-use ra_prof::profile;
 use ra_syntax::SmolStr;
 use rustc_hash::FxHashMap;
 
@@ -79,7 +78,7 @@ impl LangItems {
 
     /// Salsa query. This will look for lang items in a specific crate.
     pub(crate) fn crate_lang_items_query(db: &dyn DefDatabase, krate: CrateId) -> Arc<LangItems> {
-        let _p = profile("crate_lang_items_query");
+        let _p = profile::span("crate_lang_items_query");
 
         let mut lang_items = LangItems::default();
 
@@ -98,7 +97,7 @@ impl LangItems {
         db: &dyn DefDatabase,
         module: ModuleId,
     ) -> Option<Arc<LangItems>> {
-        let _p = profile("module_lang_items_query");
+        let _p = profile::span("module_lang_items_query");
         let mut lang_items = LangItems::default();
         lang_items.collect_lang_items(db, module);
         if lang_items.items.is_empty() {
@@ -115,7 +114,7 @@ impl LangItems {
         start_crate: CrateId,
         item: SmolStr,
     ) -> Option<LangItemTarget> {
-        let _p = profile("lang_item_query");
+        let _p = profile::span("lang_item_query");
         let lang_items = db.crate_lang_items(start_crate);
         let start_crate_target = lang_items.items.get(&item);
         if let Some(target) = start_crate_target {
diff --git a/crates/ra_hir_def/src/lib.rs b/crates/ra_hir_def/src/lib.rs
index 237b1038a..810393739 100644
--- a/crates/ra_hir_def/src/lib.rs
+++ b/crates/ra_hir_def/src/lib.rs
@@ -52,11 +52,11 @@ mod test_db;
 
 use std::hash::{Hash, Hasher};
 
+use arena::Idx;
 use hir_expand::{
     ast_id_map::FileAstId, eager::expand_eager_macro, hygiene::Hygiene, AstId, HirFileId, InFile,
     MacroCallId, MacroCallKind, MacroDefId, MacroDefKind,
 };
-use ra_arena::Idx;
 use ra_db::{impl_intern_key, salsa, CrateId};
 use ra_syntax::ast;
 
diff --git a/crates/ra_hir_def/src/nameres.rs b/crates/ra_hir_def/src/nameres.rs
index 3d9b55a73..dc239997f 100644
--- a/crates/ra_hir_def/src/nameres.rs
+++ b/crates/ra_hir_def/src/nameres.rs
@@ -56,10 +56,9 @@ mod tests;
 
 use std::sync::Arc;
 
+use arena::Arena;
 use hir_expand::{diagnostics::DiagnosticSink, name::Name, InFile};
-use ra_arena::Arena;
 use ra_db::{CrateId, Edition, FileId};
-use ra_prof::profile;
 use ra_syntax::ast;
 use rustc_hash::FxHashMap;
 use stdx::format_to;
@@ -172,7 +171,7 @@ pub struct ModuleData {
 
 impl CrateDefMap {
     pub(crate) fn crate_def_map_query(db: &dyn DefDatabase, krate: CrateId) -> Arc<CrateDefMap> {
-        let _p = profile("crate_def_map_query").detail(|| {
+        let _p = profile::span("crate_def_map_query").detail(|| {
             db.crate_graph()[krate]
                 .display_name
                 .as_ref()
diff --git a/crates/ra_hir_def/src/nameres/collector.rs b/crates/ra_hir_def/src/nameres/collector.rs
index 28b7a20c5..52ee401d9 100644
--- a/crates/ra_hir_def/src/nameres/collector.rs
+++ b/crates/ra_hir_def/src/nameres/collector.rs
@@ -1208,7 +1208,7 @@ fn is_macro_rules(path: &ModPath) -> bool {
 #[cfg(test)]
 mod tests {
     use crate::{db::DefDatabase, test_db::TestDB};
-    use ra_arena::Arena;
+    use arena::Arena;
     use ra_db::{fixture::WithFixture, SourceDatabase};
 
     use super::*;
diff --git a/crates/ra_hir_def/src/src.rs b/crates/ra_hir_def/src/src.rs
index 043b93fad..7a79b0314 100644
--- a/crates/ra_hir_def/src/src.rs
+++ b/crates/ra_hir_def/src/src.rs
@@ -1,7 +1,7 @@
 //! Utilities for mapping between hir IDs and the surface syntax.
 
+use arena::map::ArenaMap;
 use hir_expand::InFile;
-use ra_arena::map::ArenaMap;
 
 use crate::{db::DefDatabase, item_tree::ItemTreeNode, AssocItemLoc, ItemLoc};
 
diff --git a/crates/ra_hir_def/src/trace.rs b/crates/ra_hir_def/src/trace.rs
index ced07577d..fd64e7018 100644
--- a/crates/ra_hir_def/src/trace.rs
+++ b/crates/ra_hir_def/src/trace.rs
@@ -9,7 +9,7 @@
 //! absolute offsets. The `Trace` structure (inspired, at least in name, by
 //! Kotlin's `BindingTrace`) allows use the same code to compute both
 //! projections.
-use ra_arena::{map::ArenaMap, Arena, Idx, RawId};
+use arena::{map::ArenaMap, Arena, Idx, RawId};
 
 pub(crate) struct Trace<T, V> {
     arena: Option<Arena<T>>,
diff --git a/crates/ra_hir_expand/Cargo.toml b/crates/ra_hir_expand/Cargo.toml
index 6da0e2a16..711a93c56 100644
--- a/crates/ra_hir_expand/Cargo.toml
+++ b/crates/ra_hir_expand/Cargo.toml
@@ -13,11 +13,11 @@ log = "0.4.8"
 either = "1.5.3"
 rustc-hash = "1.0.0"
 
-ra_arena = { path = "../ra_arena" }
+arena = { path = "../arena" }
 ra_db = { path = "../ra_db" }
 ra_syntax = { path = "../ra_syntax" }
 ra_parser = { path = "../ra_parser" }
-ra_prof = { path = "../ra_prof" }
+profile = { path = "../profile" }
 tt = { path = "../ra_tt", package = "ra_tt" }
 mbe = { path = "../ra_mbe", package = "ra_mbe" }
 test_utils = { path = "../test_utils"}
diff --git a/crates/ra_hir_expand/src/ast_id_map.rs b/crates/ra_hir_expand/src/ast_id_map.rs
index 8bfe1b4ba..703a85b0f 100644
--- a/crates/ra_hir_expand/src/ast_id_map.rs
+++ b/crates/ra_hir_expand/src/ast_id_map.rs
@@ -12,7 +12,7 @@ use std::{
     marker::PhantomData,
 };
 
-use ra_arena::{Arena, Idx};
+use arena::{Arena, Idx};
 use ra_syntax::{ast, AstNode, AstPtr, SyntaxNode, SyntaxNodePtr};
 
 /// `AstId` points to an AST node in a specific file.
diff --git a/crates/ra_hir_expand/src/db.rs b/crates/ra_hir_expand/src/db.rs
index f3b7cd492..f30528b3e 100644
--- a/crates/ra_hir_expand/src/db.rs
+++ b/crates/ra_hir_expand/src/db.rs
@@ -5,7 +5,6 @@ use std::sync::Arc;
 use mbe::{ExpandResult, MacroRules};
 use ra_db::{salsa, SourceDatabase};
 use ra_parser::FragmentKind;
-use ra_prof::profile;
 use ra_syntax::{algo::diff, AstNode, GreenNode, Parse, SyntaxKind::*, SyntaxNode};
 
 use crate::{
@@ -278,7 +277,7 @@ pub fn parse_macro_with_arg(
     macro_file: MacroFile,
     arg: Option<Arc<(tt::Subtree, mbe::TokenMap)>>,
 ) -> Option<(Parse<SyntaxNode>, Arc<mbe::TokenMap>)> {
-    let _p = profile("parse_macro_query");
+    let _p = profile::span("parse_macro_query");
 
     let macro_call_id = macro_file.macro_call_id;
     let (tt, err) = if let Some(arg) = arg {
diff --git a/crates/ra_hir_ty/Cargo.toml b/crates/ra_hir_ty/Cargo.toml
index 83397d579..380d5e601 100644
--- a/crates/ra_hir_ty/Cargo.toml
+++ b/crates/ra_hir_ty/Cargo.toml
@@ -20,9 +20,9 @@ stdx = { path = "../stdx" }
 
 hir_def = { path = "../ra_hir_def", package = "ra_hir_def" }
 hir_expand = { path = "../ra_hir_expand", package = "ra_hir_expand" }
-ra_arena = { path = "../ra_arena" }
+arena = { path = "../arena" }
 ra_db = { path = "../ra_db" }
-ra_prof = { path = "../ra_prof" }
+profile = { path = "../profile" }
 ra_syntax = { path = "../ra_syntax" }
 test_utils = { path = "../test_utils" }
 
diff --git a/crates/ra_hir_ty/src/db.rs b/crates/ra_hir_ty/src/db.rs
index c773adc67..7a28673b1 100644
--- a/crates/ra_hir_ty/src/db.rs
+++ b/crates/ra_hir_ty/src/db.rs
@@ -2,13 +2,12 @@
 
 use std::sync::Arc;
 
+use arena::map::ArenaMap;
 use hir_def::{
     db::DefDatabase, expr::ExprId, DefWithBodyId, FunctionId, GenericDefId, ImplId, LocalFieldId,
     TypeParamId, VariantId,
 };
-use ra_arena::map::ArenaMap;
 use ra_db::{impl_intern_key, salsa, CrateId, Upcast};
-use ra_prof::profile;
 
 use crate::{
     method_resolution::{InherentImpls, TraitImpls},
@@ -123,7 +122,7 @@ pub trait HirDatabase: DefDatabase + Upcast<dyn DefDatabase> {
 }
 
 fn infer_wait(db: &impl HirDatabase, def: DefWithBodyId) -> Arc<InferenceResult> {
-    let _p = profile("infer:wait").detail(|| match def {
+    let _p = profile::span("infer:wait").detail(|| match def {
         DefWithBodyId::FunctionId(it) => db.function_data(it).name.to_string(),
         DefWithBodyId::StaticId(it) => {
             db.static_data(it).name.clone().unwrap_or_else(Name::missing).to_string()
diff --git a/crates/ra_hir_ty/src/diagnostics.rs b/crates/ra_hir_ty/src/diagnostics.rs
index 7ab7f79db..55c02c1fe 100644
--- a/crates/ra_hir_ty/src/diagnostics.rs
+++ b/crates/ra_hir_ty/src/diagnostics.rs
@@ -8,7 +8,6 @@ use std::any::Any;
 use hir_def::DefWithBodyId;
 use hir_expand::diagnostics::{Diagnostic, DiagnosticSink};
 use hir_expand::{name::Name, HirFileId, InFile};
-use ra_prof::profile;
 use ra_syntax::{ast, AstPtr, SyntaxNodePtr};
 use stdx::format_to;
 
@@ -17,7 +16,7 @@ use crate::db::HirDatabase;
 pub use crate::diagnostics::expr::{record_literal_missing_fields, record_pattern_missing_fields};
 
 pub fn validate_body(db: &dyn HirDatabase, owner: DefWithBodyId, sink: &mut DiagnosticSink<'_>) {
-    let _p = profile("validate_body");
+    let _p = profile::span("validate_body");
     let infer = db.infer(owner);
     infer.add_diagnostics(db, owner, sink);
     let mut validator = expr::ExprValidator::new(owner, infer.clone(), sink);
diff --git a/crates/ra_hir_ty/src/diagnostics/match_check.rs b/crates/ra_hir_ty/src/diagnostics/match_check.rs
index deca244db..7f007f1d6 100644
--- a/crates/ra_hir_ty/src/diagnostics/match_check.rs
+++ b/crates/ra_hir_ty/src/diagnostics/match_check.rs
@@ -218,13 +218,13 @@
 //!   ```
 use std::sync::Arc;
 
+use arena::Idx;
 use hir_def::{
     adt::VariantData,
     body::Body,
     expr::{Expr, Literal, Pat, PatId},
     AdtId, EnumVariantId, VariantId,
 };
-use ra_arena::Idx;
 use smallvec::{smallvec, SmallVec};
 
 use crate::{db::HirDatabase, ApplicationTy, InferenceResult, Ty, TypeCtor};
diff --git a/crates/ra_hir_ty/src/infer.rs b/crates/ra_hir_ty/src/infer.rs
index 3d12039a6..784ae1c3c 100644
--- a/crates/ra_hir_ty/src/infer.rs
+++ b/crates/ra_hir_ty/src/infer.rs
@@ -18,6 +18,7 @@ use std::mem;
 use std::ops::Index;
 use std::sync::Arc;
 
+use arena::map::ArenaMap;
 use hir_def::{
     body::Body,
     data::{ConstData, FunctionData, StaticData},
@@ -30,8 +31,6 @@ use hir_def::{
     TypeAliasId, VariantId,
 };
 use hir_expand::{diagnostics::DiagnosticSink, name::name};
-use ra_arena::map::ArenaMap;
-use ra_prof::profile;
 use ra_syntax::SmolStr;
 use rustc_hash::FxHashMap;
 use stdx::impl_from;
@@ -64,7 +63,7 @@ mod coerce;
 
 /// The entry point of type inference.
 pub(crate) fn infer_query(db: &dyn HirDatabase, def: DefWithBodyId) -> Arc<InferenceResult> {
-    let _p = profile("infer_query");
+    let _p = profile::span("infer_query");
     let resolver = def.resolver(db.upcast());
     let mut ctx = InferenceContext::new(db, def, resolver);
 
diff --git a/crates/ra_hir_ty/src/lower.rs b/crates/ra_hir_ty/src/lower.rs
index 7638f167b..7b805fe7a 100644
--- a/crates/ra_hir_ty/src/lower.rs
+++ b/crates/ra_hir_ty/src/lower.rs
@@ -7,6 +7,7 @@
 //! This usually involves resolving names, collecting generic arguments etc.
 use std::{iter, sync::Arc};
 
+use arena::map::ArenaMap;
 use hir_def::{
     adt::StructKind,
     builtin_type::BuiltinType,
@@ -19,7 +20,6 @@ use hir_def::{
     UnionId, VariantId,
 };
 use hir_expand::name::Name;
-use ra_arena::map::ArenaMap;
 use ra_db::CrateId;
 use smallvec::SmallVec;
 use stdx::impl_from;
diff --git a/crates/ra_hir_ty/src/method_resolution.rs b/crates/ra_hir_ty/src/method_resolution.rs
index fb4b30a13..3b3bee6a7 100644
--- a/crates/ra_hir_ty/src/method_resolution.rs
+++ b/crates/ra_hir_ty/src/method_resolution.rs
@@ -13,7 +13,6 @@ use hir_def::{
 };
 use hir_expand::name::Name;
 use ra_db::CrateId;
-use ra_prof::profile;
 use rustc_hash::{FxHashMap, FxHashSet};
 
 use super::Substs;
@@ -109,7 +108,7 @@ pub struct TraitImpls {
 
 impl TraitImpls {
     pub(crate) fn trait_impls_in_crate_query(db: &dyn HirDatabase, krate: CrateId) -> Arc<Self> {
-        let _p = profile("trait_impls_in_crate_query");
+        let _p = profile::span("trait_impls_in_crate_query");
         let mut impls = Self { map: FxHashMap::default() };
 
         let crate_def_map = db.crate_def_map(krate);
@@ -135,7 +134,7 @@ impl TraitImpls {
     }
 
     pub(crate) fn trait_impls_in_deps_query(db: &dyn HirDatabase, krate: CrateId) -> Arc<Self> {
-        let _p = profile("trait_impls_in_deps_query");
+        let _p = profile::span("trait_impls_in_deps_query");
         let crate_graph = db.crate_graph();
         let mut res = Self { map: FxHashMap::default() };
 
diff --git a/crates/ra_hir_ty/src/traits.rs b/crates/ra_hir_ty/src/traits.rs
index 3f6d2cf35..2576a9dfc 100644
--- a/crates/ra_hir_ty/src/traits.rs
+++ b/crates/ra_hir_ty/src/traits.rs
@@ -5,7 +5,6 @@ use chalk_ir::cast::Cast;
 use chalk_solve::Solver;
 use hir_def::{lang_item::LangItemTarget, TraitId};
 use ra_db::CrateId;
-use ra_prof::profile;
 
 use crate::{db::HirDatabase, DebruijnIndex, Substs};
 
@@ -125,7 +124,7 @@ pub(crate) fn trait_solve_query(
     krate: CrateId,
     goal: Canonical<InEnvironment<Obligation>>,
 ) -> Option<Solution> {
-    let _p = profile("trait_solve_query").detail(|| match &goal.value.value {
+    let _p = profile::span("trait_solve_query").detail(|| match &goal.value.value {
         Obligation::Trait(it) => db.trait_data(it.trait_).name.to_string(),
         Obligation::Projection(_) => "projection".to_string(),
     });
diff --git a/crates/ra_hir_ty/src/traits/chalk.rs b/crates/ra_hir_ty/src/traits/chalk.rs
index 1c7065364..3b6af5c9a 100644
--- a/crates/ra_hir_ty/src/traits/chalk.rs
+++ b/crates/ra_hir_ty/src/traits/chalk.rs
@@ -410,7 +410,7 @@ pub(crate) fn impl_datum_query(
     krate: CrateId,
     impl_id: ImplId,
 ) -> Arc<ImplDatum> {
-    let _p = ra_prof::profile("impl_datum");
+    let _p = profile::span("impl_datum");
     debug!("impl_datum {:?}", impl_id);
     let impl_: hir_def::ImplId = from_chalk(db, impl_id);
     impl_def_datum(db, krate, impl_id, impl_)
diff --git a/crates/ra_ide/Cargo.toml b/crates/ra_ide/Cargo.toml
index f4181c4eb..bbc9ba4e7 100644
--- a/crates/ra_ide/Cargo.toml
+++ b/crates/ra_ide/Cargo.toml
@@ -27,7 +27,7 @@ ra_db = { path = "../ra_db" }
 ra_ide_db = { path = "../ra_ide_db" }
 ra_cfg = { path = "../ra_cfg" }
 ra_fmt = { path = "../ra_fmt" }
-ra_prof = { path = "../ra_prof" }
+profile = { path = "../profile" }
 test_utils = { path = "../test_utils" }
 ra_assists = { path = "../ra_assists" }
 ra_ssr = { path = "../ra_ssr" }
diff --git a/crates/ra_ide/src/diagnostics.rs b/crates/ra_ide/src/diagnostics.rs
index 1046d7ab3..07bf133bd 100644
--- a/crates/ra_ide/src/diagnostics.rs
+++ b/crates/ra_ide/src/diagnostics.rs
@@ -10,7 +10,6 @@ use hir::{diagnostics::DiagnosticSinkBuilder, Semantics};
 use itertools::Itertools;
 use ra_db::SourceDatabase;
 use ra_ide_db::RootDatabase;
-use ra_prof::profile;
 use ra_syntax::{
     ast::{self, AstNode},
     SyntaxNode, TextRange, T,
@@ -33,7 +32,7 @@ pub(crate) fn diagnostics(
     file_id: FileId,
     enable_experimental: bool,
 ) -> Vec<Diagnostic> {
-    let _p = profile("diagnostics");
+    let _p = profile::span("diagnostics");
     let sema = Semantics::new(db);
     let parse = db.parse(file_id);
     let mut res = Vec::new();
diff --git a/crates/ra_ide/src/inlay_hints.rs b/crates/ra_ide/src/inlay_hints.rs
index 1bacead63..920b04e8d 100644
--- a/crates/ra_ide/src/inlay_hints.rs
+++ b/crates/ra_ide/src/inlay_hints.rs
@@ -1,6 +1,5 @@
 use hir::{Adt, Callable, HirDisplay, Semantics, Type};
 use ra_ide_db::RootDatabase;
-use ra_prof::profile;
 use ra_syntax::{
     ast::{self, ArgListOwner, AstNode},
     match_ast, Direction, NodeOrToken, SmolStr, SyntaxKind, TextRange, T,
@@ -64,7 +63,7 @@ pub(crate) fn inlay_hints(
     file_id: FileId,
     config: &InlayHintsConfig,
 ) -> Vec<InlayHint> {
-    let _p = profile("inlay_hints");
+    let _p = profile::span("inlay_hints");
     let sema = Semantics::new(db);
     let file = sema.parse(file_id);
 
diff --git a/crates/ra_ide/src/lib.rs b/crates/ra_ide/src/lib.rs
index 89fcb6f17..bfcf5d750 100644
--- a/crates/ra_ide/src/lib.rs
+++ b/crates/ra_ide/src/lib.rs
@@ -176,7 +176,7 @@ impl AnalysisHost {
         self.db.collect_garbage();
     }
     /// NB: this clears the database
-    pub fn per_query_memory_usage(&mut self) -> Vec<(String, ra_prof::Bytes)> {
+    pub fn per_query_memory_usage(&mut self) -> Vec<(String, profile::Bytes)> {
         self.db.per_query_memory_usage()
     }
     pub fn request_cancellation(&mut self) {
diff --git a/crates/ra_ide/src/references.rs b/crates/ra_ide/src/references.rs
index 453985de3..c4eea3a45 100644
--- a/crates/ra_ide/src/references.rs
+++ b/crates/ra_ide/src/references.rs
@@ -17,7 +17,6 @@ use ra_ide_db::{
     search::SearchScope,
     RootDatabase,
 };
-use ra_prof::profile;
 use ra_syntax::{
     algo::find_node_at_offset,
     ast::{self, NameOwner},
@@ -90,7 +89,7 @@ pub(crate) fn find_all_refs(
     position: FilePosition,
     search_scope: Option<SearchScope>,
 ) -> Option<RangeInfo<ReferenceSearchResult>> {
-    let _p = profile("find_all_refs");
+    let _p = profile::span("find_all_refs");
     let syntax = sema.parse(position.file_id).syntax().clone();
 
     let (opt_name, search_kind) = if let Some(name) =
diff --git a/crates/ra_ide/src/status.rs b/crates/ra_ide/src/status.rs
index 08e6f69cb..009bb662f 100644
--- a/crates/ra_ide/src/status.rs
+++ b/crates/ra_ide/src/status.rs
@@ -1,6 +1,7 @@
 use std::{fmt, iter::FromIterator, sync::Arc};
 
 use hir::MacroFile;
+use profile::{memory_usage, Bytes};
 use ra_db::{
     salsa::debug::{DebugQueryTable, TableEntry},
     FileTextQuery, SourceRootId,
@@ -9,7 +10,6 @@ use ra_ide_db::{
     symbol_index::{LibrarySymbolsQuery, SymbolIndex},
     RootDatabase,
 };
-use ra_prof::{memory_usage, Bytes};
 use ra_syntax::{ast, Parse, SyntaxNode};
 use rustc_hash::FxHashMap;
 
diff --git a/crates/ra_ide/src/syntax_highlighting.rs b/crates/ra_ide/src/syntax_highlighting.rs
index c10e15db8..ebdf05127 100644
--- a/crates/ra_ide/src/syntax_highlighting.rs
+++ b/crates/ra_ide/src/syntax_highlighting.rs
@@ -9,7 +9,6 @@ use ra_ide_db::{
     defs::{classify_name, classify_name_ref, Definition, NameClass, NameRefClass},
     RootDatabase,
 };
-use ra_prof::profile;
 use ra_syntax::{
     ast::{self, HasFormatSpecifier},
     AstNode, AstToken, Direction, NodeOrToken, SyntaxElement,
@@ -46,7 +45,7 @@ pub(crate) fn highlight(
     range_to_highlight: Option<TextRange>,
     syntactic_name_ref_highlighting: bool,
 ) -> Vec<HighlightedRange> {
-    let _p = profile("highlight");
+    let _p = profile::span("highlight");
     let sema = Semantics::new(db);
 
     // Determine the root based on the given range.
diff --git a/crates/ra_ide_db/Cargo.toml b/crates/ra_ide_db/Cargo.toml
index 2716a38cc..92b8ef82a 100644
--- a/crates/ra_ide_db/Cargo.toml
+++ b/crates/ra_ide_db/Cargo.toml
@@ -24,7 +24,7 @@ stdx = { path = "../stdx" }
 ra_syntax = { path = "../ra_syntax" }
 ra_text_edit = { path = "../ra_text_edit" }
 ra_db = { path = "../ra_db" }
-ra_prof = { path = "../ra_prof" }
+profile = { path = "../profile" }
 test_utils = { path = "../test_utils" }
 
 # ra_ide should depend only on the top-level `hir` package. if you need
diff --git a/crates/ra_ide_db/src/change.rs b/crates/ra_ide_db/src/change.rs
index b13df8b85..7a4e04ca9 100644
--- a/crates/ra_ide_db/src/change.rs
+++ b/crates/ra_ide_db/src/change.rs
@@ -3,11 +3,11 @@
 
 use std::{fmt, sync::Arc, time};
 
+use profile::{memory_usage, Bytes};
 use ra_db::{
     salsa::{Database, Durability, SweepStrategy},
     CrateGraph, FileId, SourceDatabase, SourceDatabaseExt, SourceRoot, SourceRootId,
 };
-use ra_prof::{memory_usage, profile, Bytes};
 use rustc_hash::FxHashSet;
 
 use crate::{symbol_index::SymbolsDatabase, RootDatabase};
@@ -85,12 +85,12 @@ const GC_COOLDOWN: time::Duration = time::Duration::from_millis(100);
 
 impl RootDatabase {
     pub fn request_cancellation(&mut self) {
-        let _p = profile("RootDatabase::request_cancellation");
+        let _p = profile::span("RootDatabase::request_cancellation");
         self.salsa_runtime_mut().synthetic_write(Durability::LOW);
     }
 
     pub fn apply_change(&mut self, change: AnalysisChange) {
-        let _p = profile("RootDatabase::apply_change");
+        let _p = profile::span("RootDatabase::apply_change");
         self.request_cancellation();
         log::info!("apply_change {:?}", change);
         if let Some(roots) = change.roots {
@@ -141,7 +141,7 @@ impl RootDatabase {
             return;
         }
 
-        let _p = profile("RootDatabase::collect_garbage");
+        let _p = profile::span("RootDatabase::collect_garbage");
         self.last_gc = crate::wasm_shims::Instant::now();
 
         let sweep = SweepStrategy::default().discard_values().sweep_all_revisions();
diff --git a/crates/ra_ide_db/src/defs.rs b/crates/ra_ide_db/src/defs.rs
index 9bb95277d..d46d1fe71 100644
--- a/crates/ra_ide_db/src/defs.rs
+++ b/crates/ra_ide_db/src/defs.rs
@@ -9,7 +9,6 @@ use hir::{
     db::HirDatabase, Crate, Field, HasVisibility, ImplDef, Local, MacroDef, Module, ModuleDef,
     Name, PathResolution, Semantics, TypeParam, Visibility,
 };
-use ra_prof::profile;
 use ra_syntax::{
     ast::{self, AstNode},
     match_ast, SyntaxNode,
@@ -110,7 +109,7 @@ impl NameClass {
 }
 
 pub fn classify_name(sema: &Semantics<RootDatabase>, name: &ast::Name) -> Option<NameClass> {
-    let _p = profile("classify_name");
+    let _p = profile::span("classify_name");
 
     let parent = name.syntax().parent()?;
 
@@ -249,7 +248,7 @@ pub fn classify_name_ref(
     sema: &Semantics<RootDatabase>,
     name_ref: &ast::NameRef,
 ) -> Option<NameRefClass> {
-    let _p = profile("classify_name_ref");
+    let _p = profile::span("classify_name_ref");
 
     let parent = name_ref.syntax().parent()?;
 
diff --git a/crates/ra_ide_db/src/imports_locator.rs b/crates/ra_ide_db/src/imports_locator.rs
index 9e040973b..d510ce3b7 100644
--- a/crates/ra_ide_db/src/imports_locator.rs
+++ b/crates/ra_ide_db/src/imports_locator.rs
@@ -2,7 +2,6 @@
 //! Later, this should be moved away to a separate crate that is accessible from the ra_assists module.
 
 use hir::{Crate, MacroDef, ModuleDef, Semantics};
-use ra_prof::profile;
 use ra_syntax::{ast, AstNode, SyntaxKind::NAME};
 
 use crate::{
@@ -18,7 +17,7 @@ pub fn find_imports<'a>(
     krate: Crate,
     name_to_import: &str,
 ) -> Vec<Either<ModuleDef, MacroDef>> {
-    let _p = profile("search_for_imports");
+    let _p = profile::span("search_for_imports");
     let db = sema.db;
 
     // Query dependencies first.
@@ -51,7 +50,7 @@ fn get_name_definition<'a>(
     sema: &Semantics<'a, RootDatabase>,
     import_candidate: &FileSymbol,
 ) -> Option<Definition> {
-    let _p = profile("get_name_definition");
+    let _p = profile::span("get_name_definition");
     let file_id = import_candidate.file_id;
 
     let candidate_node = import_candidate.ptr.to_node(sema.parse(file_id).syntax());
diff --git a/crates/ra_ide_db/src/search.rs b/crates/ra_ide_db/src/search.rs
index 0b862b449..d90b830d0 100644
--- a/crates/ra_ide_db/src/search.rs
+++ b/crates/ra_ide_db/src/search.rs
@@ -9,7 +9,6 @@ use std::{convert::TryInto, mem};
 use hir::{DefWithBody, HasSource, Module, ModuleSource, Semantics, Visibility};
 use once_cell::unsync::Lazy;
 use ra_db::{FileId, FileRange, SourceDatabaseExt};
-use ra_prof::profile;
 use ra_syntax::{ast, match_ast, AstNode, TextRange, TextSize};
 use rustc_hash::FxHashMap;
 
@@ -107,7 +106,7 @@ impl IntoIterator for SearchScope {
 
 impl Definition {
     fn search_scope(&self, db: &RootDatabase) -> SearchScope {
-        let _p = profile("search_scope");
+        let _p = profile::span("search_scope");
         let module = match self.module(db) {
             Some(it) => it,
             None => return SearchScope::empty(),
@@ -187,7 +186,7 @@ impl Definition {
         sema: &Semantics<RootDatabase>,
         search_scope: Option<SearchScope>,
     ) -> Vec<Reference> {
-        let _p = profile("Definition::find_usages");
+        let _p = profile::span("Definition::find_usages");
 
         let search_scope = {
             let base = self.search_scope(sema.db);
diff --git a/crates/ra_ide_db/src/symbol_index.rs b/crates/ra_ide_db/src/symbol_index.rs
index 35a2c5be3..6ca8bb516 100644
--- a/crates/ra_ide_db/src/symbol_index.rs
+++ b/crates/ra_ide_db/src/symbol_index.rs
@@ -34,7 +34,6 @@ use ra_db::{
     salsa::{self, ParallelDatabase},
     CrateId, FileId, SourceDatabaseExt, SourceRootId,
 };
-use ra_prof::profile;
 use ra_syntax::{
     ast::{self, NameOwner},
     match_ast, AstNode, Parse, SmolStr, SourceFile,
@@ -101,7 +100,7 @@ pub trait SymbolsDatabase: hir::db::HirDatabase + SourceDatabaseExt {
 }
 
 fn library_symbols(db: &dyn SymbolsDatabase) -> Arc<FxHashMap<SourceRootId, SymbolIndex>> {
-    let _p = profile("library_symbols");
+    let _p = profile::span("library_symbols");
 
     let roots = db.library_roots();
     let res = roots
@@ -162,7 +161,7 @@ impl<DB: ParallelDatabase> Clone for Snap<salsa::Snapshot<DB>> {
 // | VS Code | kbd:[Ctrl+T]
 // |===
 pub fn world_symbols(db: &RootDatabase, query: Query) -> Vec<FileSymbol> {
-    let _p = ra_prof::profile("world_symbols").detail(|| query.query.clone());
+    let _p = profile::span("world_symbols").detail(|| query.query.clone());
 
     let tmp1;
     let tmp2;
diff --git a/crates/ra_project_model/Cargo.toml b/crates/ra_project_model/Cargo.toml
index 99adea8e4..27b1f5d33 100644
--- a/crates/ra_project_model/Cargo.toml
+++ b/crates/ra_project_model/Cargo.toml
@@ -14,7 +14,7 @@ rustc-hash = "1.1.0"
 
 cargo_metadata = "0.11.1"
 
-ra_arena = { path = "../ra_arena" }
+arena = { path = "../arena" }
 ra_cfg = { path = "../ra_cfg" }
 ra_db = { path = "../ra_db" }
 ra_toolchain = { path = "../ra_toolchain" }
diff --git a/crates/ra_project_model/src/cargo_workspace.rs b/crates/ra_project_model/src/cargo_workspace.rs
index 10513542e..a526d743d 100644
--- a/crates/ra_project_model/src/cargo_workspace.rs
+++ b/crates/ra_project_model/src/cargo_workspace.rs
@@ -8,9 +8,9 @@ use std::{
 };
 
 use anyhow::{Context, Result};
+use arena::{Arena, Idx};
 use cargo_metadata::{BuildScript, CargoOpt, Message, MetadataCommand, PackageId};
 use paths::{AbsPath, AbsPathBuf};
-use ra_arena::{Arena, Idx};
 use ra_db::Edition;
 use rustc_hash::FxHashMap;
 
diff --git a/crates/ra_project_model/src/sysroot.rs b/crates/ra_project_model/src/sysroot.rs
index a10ade375..6ef001769 100644
--- a/crates/ra_project_model/src/sysroot.rs
+++ b/crates/ra_project_model/src/sysroot.rs
@@ -3,8 +3,8 @@
 use std::{convert::TryFrom, env, ops, path::Path, process::Command};
 
 use anyhow::{bail, format_err, Result};
+use arena::{Arena, Idx};
 use paths::{AbsPath, AbsPathBuf};
-use ra_arena::{Arena, Idx};
 
 use crate::utf8_stdout;
 
diff --git a/crates/rust-analyzer/Cargo.toml b/crates/rust-analyzer/Cargo.toml
index 02c1371ac..6cbf43bb2 100644
--- a/crates/rust-analyzer/Cargo.toml
+++ b/crates/rust-analyzer/Cargo.toml
@@ -36,7 +36,7 @@ stdx = { path = "../stdx" }
 lsp-server = "0.3.3"
 flycheck = { path = "../flycheck" }
 ra_ide = { path = "../ra_ide" }
-ra_prof = { path = "../ra_prof" }
+profile = { path = "../profile" }
 ra_project_model = { path = "../ra_project_model" }
 ra_syntax = { path = "../ra_syntax" }
 ra_text_edit = { path = "../ra_text_edit" }
diff --git a/crates/rust-analyzer/src/bin/main.rs b/crates/rust-analyzer/src/bin/main.rs
index fc7f8b01d..9622d71c0 100644
--- a/crates/rust-analyzer/src/bin/main.rs
+++ b/crates/rust-analyzer/src/bin/main.rs
@@ -55,7 +55,7 @@ fn try_main() -> Result<()> {
 fn setup_logging() -> Result<()> {
     std::env::set_var("RUST_BACKTRACE", "short");
     env_logger::try_init_from_env("RA_LOG")?;
-    ra_prof::init();
+    profile::init();
     Ok(())
 }
 
diff --git a/crates/rust-analyzer/src/cli.rs b/crates/rust-analyzer/src/cli.rs
index 1034d11bd..46d70fcb2 100644
--- a/crates/rust-analyzer/src/cli.rs
+++ b/crates/rust-analyzer/src/cli.rs
@@ -11,7 +11,6 @@ use std::io::Read;
 
 use anyhow::Result;
 use ra_ide::Analysis;
-use ra_prof::profile;
 use ra_syntax::{AstNode, SourceFile};
 
 pub use analysis_bench::{BenchCmd, BenchWhat, Position};
@@ -38,7 +37,7 @@ impl Verbosity {
 }
 
 pub fn parse(no_dump: bool) -> Result<()> {
-    let _p = profile("parsing");
+    let _p = profile::span("parsing");
     let file = file()?;
     if !no_dump {
         println!("{:#?}", file.syntax());
diff --git a/crates/rust-analyzer/src/cli/analysis_bench.rs b/crates/rust-analyzer/src/cli/analysis_bench.rs
index c54ee5f4d..bc5f77e1a 100644
--- a/crates/rust-analyzer/src/cli/analysis_bench.rs
+++ b/crates/rust-analyzer/src/cli/analysis_bench.rs
@@ -52,7 +52,7 @@ impl FromStr for Position {
 
 impl BenchCmd {
     pub fn run(self, verbosity: Verbosity) -> Result<()> {
-        ra_prof::init();
+        profile::init();
 
         let start = Instant::now();
         eprint!("loading: ");
diff --git a/crates/rust-analyzer/src/cli/analysis_stats.rs b/crates/rust-analyzer/src/cli/analysis_stats.rs
index 0d386841e..a30c1ec79 100644
--- a/crates/rust-analyzer/src/cli/analysis_stats.rs
+++ b/crates/rust-analyzer/src/cli/analysis_stats.rs
@@ -29,7 +29,7 @@ use crate::{
     },
     print_memory_usage,
 };
-use ra_prof::StopWatch;
+use profile::StopWatch;
 
 /// Need to wrap Snapshot to provide `Clone` impl for `map_with`
 struct Snap<DB>(DB);
diff --git a/crates/rust-analyzer/src/global_state.rs b/crates/rust-analyzer/src/global_state.rs
index 658a50d15..8c115c8a6 100644
--- a/crates/rust-analyzer/src/global_state.rs
+++ b/crates/rust-analyzer/src/global_state.rs
@@ -27,7 +27,6 @@ use crate::{
     to_proto::url_from_abs_path,
     Result,
 };
-use ra_prof::profile;
 
 #[derive(Eq, PartialEq, Copy, Clone)]
 pub(crate) enum Status {
@@ -135,7 +134,7 @@ impl GlobalState {
     }
 
     pub(crate) fn process_changes(&mut self) -> bool {
-        let _p = profile("GlobalState::process_changes");
+        let _p = profile::span("GlobalState::process_changes");
         let mut fs_changes = Vec::new();
         let mut has_fs_changes = false;
 
diff --git a/crates/rust-analyzer/src/handlers.rs b/crates/rust-analyzer/src/handlers.rs
index 785dd2a26..d9b75eed4 100644
--- a/crates/rust-analyzer/src/handlers.rs
+++ b/crates/rust-analyzer/src/handlers.rs
@@ -22,7 +22,6 @@ use ra_ide::{
     FileId, FilePosition, FileRange, HoverAction, HoverGotoTypeData, NavigationTarget, Query,
     RangeInfo, Runnable, RunnableKind, SearchScope, TextEdit,
 };
-use ra_prof::profile;
 use ra_project_model::TargetKind;
 use ra_syntax::{algo, ast, AstNode, SyntaxKind, TextRange, TextSize};
 use serde::{Deserialize, Serialize};
@@ -39,7 +38,7 @@ use crate::{
 };
 
 pub(crate) fn handle_analyzer_status(snap: GlobalStateSnapshot, _: ()) -> Result<String> {
-    let _p = profile("handle_analyzer_status");
+    let _p = profile::span("handle_analyzer_status");
 
     let mut buf = String::new();
     if snap.workspaces.is_empty() {
@@ -64,7 +63,7 @@ pub(crate) fn handle_analyzer_status(snap: GlobalStateSnapshot, _: ()) -> Result
 }
 
 pub(crate) fn handle_memory_usage(state: &mut GlobalState, _: ()) -> Result<String> {
-    let _p = profile("handle_memory_usage");
+    let _p = profile::span("handle_memory_usage");
     let mem = state.analysis_host.per_query_memory_usage();
 
     let mut out = String::new();
@@ -78,7 +77,7 @@ pub(crate) fn handle_syntax_tree(
     snap: GlobalStateSnapshot,
     params: lsp_ext::SyntaxTreeParams,
 ) -> Result<String> {
-    let _p = profile("handle_syntax_tree");
+    let _p = profile::span("handle_syntax_tree");
     let id = from_proto::file_id(&snap, &params.text_document.uri)?;
     let line_index = snap.analysis.file_line_index(id)?;
     let text_range = params.range.map(|r| from_proto::text_range(&line_index, r));
@@ -90,7 +89,7 @@ pub(crate) fn handle_expand_macro(
     snap: GlobalStateSnapshot,
     params: lsp_ext::ExpandMacroParams,
 ) -> Result<Option<lsp_ext::ExpandedMacro>> {
-    let _p = profile("handle_expand_macro");
+    let _p = profile::span("handle_expand_macro");
     let file_id = from_proto::file_id(&snap, &params.text_document.uri)?;
     let line_index = snap.analysis.file_line_index(file_id)?;
     let offset = from_proto::offset(&line_index, params.position);
@@ -103,7 +102,7 @@ pub(crate) fn handle_selection_range(
     snap: GlobalStateSnapshot,
     params: lsp_types::SelectionRangeParams,
 ) -> Result<Option<Vec<lsp_types::SelectionRange>>> {
-    let _p = profile("handle_selection_range");
+    let _p = profile::span("handle_selection_range");
     let file_id = from_proto::file_id(&snap, &params.text_document.uri)?;
     let line_index = snap.analysis.file_line_index(file_id)?;
     let res: Result<Vec<lsp_types::SelectionRange>> = params
@@ -146,7 +145,7 @@ pub(crate) fn handle_matching_brace(
     snap: GlobalStateSnapshot,
     params: lsp_ext::MatchingBraceParams,
 ) -> Result<Vec<Position>> {
-    let _p = profile("handle_matching_brace");
+    let _p = profile::span("handle_matching_brace");
     let file_id = from_proto::file_id(&snap, &params.text_document.uri)?;
     let line_index = snap.analysis.file_line_index(file_id)?;
     let res = params
@@ -168,7 +167,7 @@ pub(crate) fn handle_join_lines(
     snap: GlobalStateSnapshot,
     params: lsp_ext::JoinLinesParams,
 ) -> Result<Vec<lsp_types::TextEdit>> {
-    let _p = profile("handle_join_lines");
+    let _p = profile::span("handle_join_lines");
     let file_id = from_proto::file_id(&snap, &params.text_document.uri)?;
     let line_index = snap.analysis.file_line_index(file_id)?;
     let line_endings = snap.file_line_endings(file_id);
@@ -191,7 +190,7 @@ pub(crate) fn handle_on_enter(
     snap: GlobalStateSnapshot,
     params: lsp_types::TextDocumentPositionParams,
 ) -> Result<Option<Vec<lsp_ext::SnippetTextEdit>>> {
-    let _p = profile("handle_on_enter");
+    let _p = profile::span("handle_on_enter");
     let position = from_proto::file_position(&snap, params)?;
     let edit = match snap.analysis.on_enter(position)? {
         None => return Ok(None),
@@ -208,7 +207,7 @@ pub(crate) fn handle_on_type_formatting(
     snap: GlobalStateSnapshot,
     params: lsp_types::DocumentOnTypeFormattingParams,
 ) -> Result<Option<Vec<lsp_types::TextEdit>>> {
-    let _p = profile("handle_on_type_formatting");
+    let _p = profile::span("handle_on_type_formatting");
     let mut position = from_proto::file_position(&snap, params.text_document_position)?;
     let line_index = snap.analysis.file_line_index(position.file_id)?;
     let line_endings = snap.file_line_endings(position.file_id);
@@ -247,7 +246,7 @@ pub(crate) fn handle_document_symbol(
     snap: GlobalStateSnapshot,
     params: lsp_types::DocumentSymbolParams,
 ) -> Result<Option<lsp_types::DocumentSymbolResponse>> {
-    let _p = profile("handle_document_symbol");
+    let _p = profile::span("handle_document_symbol");
     let file_id = from_proto::file_id(&snap, &params.text_document.uri)?;
     let line_index = snap.analysis.file_line_index(file_id)?;
 
@@ -332,7 +331,7 @@ pub(crate) fn handle_workspace_symbol(
     snap: GlobalStateSnapshot,
     params: lsp_types::WorkspaceSymbolParams,
 ) -> Result<Option<Vec<SymbolInformation>>> {
-    let _p = profile("handle_workspace_symbol");
+    let _p = profile::span("handle_workspace_symbol");
     let all_symbols = params.query.contains('#');
     let libs = params.query.contains('*');
     let query = {
@@ -380,7 +379,7 @@ pub(crate) fn handle_goto_definition(
     snap: GlobalStateSnapshot,
     params: lsp_types::GotoDefinitionParams,
 ) -> Result<Option<lsp_types::GotoDefinitionResponse>> {
-    let _p = profile("handle_goto_definition");
+    let _p = profile::span("handle_goto_definition");
     let position = from_proto::file_position(&snap, params.text_document_position_params)?;
     let nav_info = match snap.analysis.goto_definition(position)? {
         None => return Ok(None),
@@ -395,7 +394,7 @@ pub(crate) fn handle_goto_implementation(
     snap: GlobalStateSnapshot,
     params: lsp_types::request::GotoImplementationParams,
 ) -> Result<Option<lsp_types::request::GotoImplementationResponse>> {
-    let _p = profile("handle_goto_implementation");
+    let _p = profile::span("handle_goto_implementation");
     let position = from_proto::file_position(&snap, params.text_document_position_params)?;
     let nav_info = match snap.analysis.goto_implementation(position)? {
         None => return Ok(None),
@@ -410,7 +409,7 @@ pub(crate) fn handle_goto_type_definition(
     snap: GlobalStateSnapshot,
     params: lsp_types::request::GotoTypeDefinitionParams,
 ) -> Result<Option<lsp_types::request::GotoTypeDefinitionResponse>> {
-    let _p = profile("handle_goto_type_definition");
+    let _p = profile::span("handle_goto_type_definition");
     let position = from_proto::file_position(&snap, params.text_document_position_params)?;
     let nav_info = match snap.analysis.goto_type_definition(position)? {
         None => return Ok(None),
@@ -425,7 +424,7 @@ pub(crate) fn handle_parent_module(
     snap: GlobalStateSnapshot,
     params: lsp_types::TextDocumentPositionParams,
 ) -> Result<Option<lsp_types::GotoDefinitionResponse>> {
-    let _p = profile("handle_parent_module");
+    let _p = profile::span("handle_parent_module");
     let position = from_proto::file_position(&snap, params)?;
     let navs = snap.analysis.parent_module(position)?;
     let res = to_proto::goto_definition_response(&snap, None, navs)?;
@@ -436,7 +435,7 @@ pub(crate) fn handle_runnables(
     snap: GlobalStateSnapshot,
     params: lsp_ext::RunnablesParams,
 ) -> Result<Vec<lsp_ext::Runnable>> {
-    let _p = profile("handle_runnables");
+    let _p = profile::span("handle_runnables");
     let file_id = from_proto::file_id(&snap, &params.text_document.uri)?;
     let line_index = snap.analysis.file_line_index(file_id)?;
     let offset = params.position.map(|it| from_proto::offset(&line_index, it));
@@ -513,7 +512,7 @@ pub(crate) fn handle_completion(
     snap: GlobalStateSnapshot,
     params: lsp_types::CompletionParams,
 ) -> Result<Option<lsp_types::CompletionResponse>> {
-    let _p = profile("handle_completion");
+    let _p = profile::span("handle_completion");
     let position = from_proto::file_position(&snap, params.text_document_position)?;
     let completion_triggered_after_single_colon = {
         let mut res = false;
@@ -555,7 +554,7 @@ pub(crate) fn handle_folding_range(
     snap: GlobalStateSnapshot,
     params: FoldingRangeParams,
 ) -> Result<Option<Vec<FoldingRange>>> {
-    let _p = profile("handle_folding_range");
+    let _p = profile::span("handle_folding_range");
     let file_id = from_proto::file_id(&snap, &params.text_document.uri)?;
     let folds = snap.analysis.folding_ranges(file_id)?;
     let text = snap.analysis.file_text(file_id)?;
@@ -572,7 +571,7 @@ pub(crate) fn handle_signature_help(
     snap: GlobalStateSnapshot,
     params: lsp_types::SignatureHelpParams,
 ) -> Result<Option<lsp_types::SignatureHelp>> {
-    let _p = profile("handle_signature_help");
+    let _p = profile::span("handle_signature_help");
     let position = from_proto::file_position(&snap, params.text_document_position_params)?;
     let call_info = match snap.analysis.call_info(position)? {
         Some(it) => it,
@@ -591,7 +590,7 @@ pub(crate) fn handle_hover(
     snap: GlobalStateSnapshot,
     params: lsp_types::HoverParams,
 ) -> Result<Option<lsp_ext::Hover>> {
-    let _p = profile("handle_hover");
+    let _p = profile::span("handle_hover");
     let position = from_proto::file_position(&snap, params.text_document_position_params)?;
     let info = match snap.analysis.hover(position)? {
         None => return Ok(None),
@@ -614,7 +613,7 @@ pub(crate) fn handle_prepare_rename(
     snap: GlobalStateSnapshot,
     params: lsp_types::TextDocumentPositionParams,
 ) -> Result<Option<PrepareRenameResponse>> {
-    let _p = profile("handle_prepare_rename");
+    let _p = profile::span("handle_prepare_rename");
     let position = from_proto::file_position(&snap, params)?;
 
     let optional_change = snap.analysis.rename(position, "dummy")?;
@@ -632,7 +631,7 @@ pub(crate) fn handle_rename(
     snap: GlobalStateSnapshot,
     params: RenameParams,
 ) -> Result<Option<WorkspaceEdit>> {
-    let _p = profile("handle_rename");
+    let _p = profile::span("handle_rename");
     let position = from_proto::file_position(&snap, params.text_document_position)?;
 
     if params.new_name.is_empty() {
@@ -656,7 +655,7 @@ pub(crate) fn handle_references(
     snap: GlobalStateSnapshot,
     params: lsp_types::ReferenceParams,
 ) -> Result<Option<Vec<Location>>> {
-    let _p = profile("handle_references");
+    let _p = profile::span("handle_references");
     let position = from_proto::file_position(&snap, params.text_document_position)?;
 
     let refs = match snap.analysis.find_all_refs(position, None)? {
@@ -683,7 +682,7 @@ pub(crate) fn handle_formatting(
     snap: GlobalStateSnapshot,
     params: DocumentFormattingParams,
 ) -> Result<Option<Vec<lsp_types::TextEdit>>> {
-    let _p = profile("handle_formatting");
+    let _p = profile::span("handle_formatting");
     let file_id = from_proto::file_id(&snap, &params.text_document.uri)?;
     let file = snap.analysis.file_text(file_id)?;
     let crate_ids = snap.analysis.crate_for(file_id)?;
@@ -805,7 +804,7 @@ pub(crate) fn handle_code_action(
     mut snap: GlobalStateSnapshot,
     params: lsp_types::CodeActionParams,
 ) -> Result<Option<Vec<lsp_ext::CodeAction>>> {
-    let _p = profile("handle_code_action");
+    let _p = profile::span("handle_code_action");
     // We intentionally don't support command-based actions, as those either
     // requires custom client-code anyway, or requires server-initiated edits.
     // Server initiated edits break causality, so we avoid those as well.
@@ -847,7 +846,7 @@ pub(crate) fn handle_resolve_code_action(
     mut snap: GlobalStateSnapshot,
     params: lsp_ext::ResolveCodeActionParams,
 ) -> Result<Option<lsp_ext::SnippetWorkspaceEdit>> {
-    let _p = profile("handle_resolve_code_action");
+    let _p = profile::span("handle_resolve_code_action");
     let file_id = from_proto::file_id(&snap, &params.code_action_params.text_document.uri)?;
     let line_index = snap.analysis.file_line_index(file_id)?;
     let range = from_proto::text_range(&line_index, params.code_action_params.range);
@@ -871,7 +870,7 @@ pub(crate) fn handle_code_lens(
     snap: GlobalStateSnapshot,
     params: lsp_types::CodeLensParams,
 ) -> Result<Option<Vec<CodeLens>>> {
-    let _p = profile("handle_code_lens");
+    let _p = profile::span("handle_code_lens");
     let mut lenses: Vec<CodeLens> = Default::default();
 
     if snap.config.lens.none() {
@@ -957,7 +956,7 @@ pub(crate) fn handle_code_lens_resolve(
     snap: GlobalStateSnapshot,
     code_lens: CodeLens,
 ) -> Result<CodeLens> {
-    let _p = profile("handle_code_lens_resolve");
+    let _p = profile::span("handle_code_lens_resolve");
     let data = code_lens.data.unwrap();
     let resolve = from_json::<Option<CodeLensResolveData>>("CodeLensResolveData", data)?;
     match resolve {
@@ -994,7 +993,7 @@ pub(crate) fn handle_document_highlight(
     snap: GlobalStateSnapshot,
     params: lsp_types::DocumentHighlightParams,
 ) -> Result<Option<Vec<DocumentHighlight>>> {
-    let _p = profile("handle_document_highlight");
+    let _p = profile::span("handle_document_highlight");
     let position = from_proto::file_position(&snap, params.text_document_position_params)?;
     let line_index = snap.analysis.file_line_index(position.file_id)?;
 
@@ -1021,7 +1020,7 @@ pub(crate) fn handle_ssr(
     snap: GlobalStateSnapshot,
     params: lsp_ext::SsrParams,
 ) -> Result<lsp_types::WorkspaceEdit> {
-    let _p = profile("handle_ssr");
+    let _p = profile::span("handle_ssr");
     let selections = params
         .selections
         .iter()
@@ -1041,7 +1040,7 @@ pub(crate) fn publish_diagnostics(
     snap: &GlobalStateSnapshot,
     file_id: FileId,
 ) -> Result<Vec<Diagnostic>> {
-    let _p = profile("publish_diagnostics");
+    let _p = profile::span("publish_diagnostics");
     let line_index = snap.analysis.file_line_index(file_id)?;
     let diagnostics: Vec<Diagnostic> = snap
         .analysis
@@ -1064,7 +1063,7 @@ pub(crate) fn handle_inlay_hints(
     snap: GlobalStateSnapshot,
     params: InlayHintsParams,
 ) -> Result<Vec<InlayHint>> {
-    let _p = profile("handle_inlay_hints");
+    let _p = profile::span("handle_inlay_hints");
     let file_id = from_proto::file_id(&snap, &params.text_document.uri)?;
     let line_index = snap.analysis.file_line_index(file_id)?;
     Ok(snap
@@ -1079,7 +1078,7 @@ pub(crate) fn handle_call_hierarchy_prepare(
     snap: GlobalStateSnapshot,
     params: CallHierarchyPrepareParams,
 ) -> Result<Option<Vec<CallHierarchyItem>>> {
-    let _p = profile("handle_call_hierarchy_prepare");
+    let _p = profile::span("handle_call_hierarchy_prepare");
     let position = from_proto::file_position(&snap, params.text_document_position_params)?;
 
     let nav_info = match snap.analysis.call_hierarchy(position)? {
@@ -1101,7 +1100,7 @@ pub(crate) fn handle_call_hierarchy_incoming(
     snap: GlobalStateSnapshot,
     params: CallHierarchyIncomingCallsParams,
 ) -> Result<Option<Vec<CallHierarchyIncomingCall>>> {
-    let _p = profile("handle_call_hierarchy_incoming");
+    let _p = profile::span("handle_call_hierarchy_incoming");
     let item = params.item;
 
     let doc = TextDocumentIdentifier::new(item.uri);
@@ -1136,7 +1135,7 @@ pub(crate) fn handle_call_hierarchy_outgoing(
     snap: GlobalStateSnapshot,
     params: CallHierarchyOutgoingCallsParams,
 ) -> Result<Option<Vec<CallHierarchyOutgoingCall>>> {
-    let _p = profile("handle_call_hierarchy_outgoing");
+    let _p = profile::span("handle_call_hierarchy_outgoing");
     let item = params.item;
 
     let doc = TextDocumentIdentifier::new(item.uri);
@@ -1171,7 +1170,7 @@ pub(crate) fn handle_semantic_tokens(
     snap: GlobalStateSnapshot,
     params: SemanticTokensParams,
 ) -> Result<Option<SemanticTokensResult>> {
-    let _p = profile("handle_semantic_tokens");
+    let _p = profile::span("handle_semantic_tokens");
 
     let file_id = from_proto::file_id(&snap, &params.text_document.uri)?;
     let text = snap.analysis.file_text(file_id)?;
@@ -1190,7 +1189,7 @@ pub(crate) fn handle_semantic_tokens_edits(
     snap: GlobalStateSnapshot,
     params: SemanticTokensEditsParams,
 ) -> Result<Option<SemanticTokensEditResult>> {
-    let _p = profile("handle_semantic_tokens_edits");
+    let _p = profile::span("handle_semantic_tokens_edits");
 
     let file_id = from_proto::file_id(&snap, &params.text_document.uri)?;
     let text = snap.analysis.file_text(file_id)?;
@@ -1220,7 +1219,7 @@ pub(crate) fn handle_semantic_tokens_range(
     snap: GlobalStateSnapshot,
     params: SemanticTokensRangeParams,
 ) -> Result<Option<SemanticTokensRangeResult>> {
-    let _p = profile("handle_semantic_tokens_range");
+    let _p = profile::span("handle_semantic_tokens_range");
 
     let frange = from_proto::file_range(&snap, params.text_document, params.range)?;
     let text = snap.analysis.file_text(frange.file_id)?;
diff --git a/crates/rust-analyzer/src/lib.rs b/crates/rust-analyzer/src/lib.rs
index ed37992cd..8d2e76cc2 100644
--- a/crates/rust-analyzer/src/lib.rs
+++ b/crates/rust-analyzer/src/lib.rs
@@ -74,16 +74,16 @@ impl std::error::Error for LspError {}
 fn print_memory_usage(mut host: AnalysisHost, vfs: Vfs) {
     let mut mem = host.per_query_memory_usage();
 
-    let before = ra_prof::memory_usage();
+    let before = profile::memory_usage();
     drop(vfs);
-    let vfs = before.allocated - ra_prof::memory_usage().allocated;
+    let vfs = before.allocated - profile::memory_usage().allocated;
     mem.push(("VFS".into(), vfs));
 
-    let before = ra_prof::memory_usage();
+    let before = profile::memory_usage();
     drop(host);
-    mem.push(("Unaccounted".into(), before.allocated - ra_prof::memory_usage().allocated));
+    mem.push(("Unaccounted".into(), before.allocated - profile::memory_usage().allocated));
 
-    mem.push(("Remaining".into(), ra_prof::memory_usage().allocated));
+    mem.push(("Remaining".into(), profile::memory_usage().allocated));
 
     for (name, bytes) in mem {
         eprintln!("{:>8} {}", bytes, name);
diff --git a/crates/rust-analyzer/src/main_loop.rs b/crates/rust-analyzer/src/main_loop.rs
index e6cf46df2..32962b088 100644
--- a/crates/rust-analyzer/src/main_loop.rs
+++ b/crates/rust-analyzer/src/main_loop.rs
@@ -10,7 +10,6 @@ use lsp_server::{Connection, Notification, Request, Response};
 use lsp_types::notification::Notification as _;
 use ra_db::VfsPath;
 use ra_ide::{Canceled, FileId};
-use ra_prof::profile;
 
 use crate::{
     config::Config,
@@ -173,7 +172,7 @@ impl GlobalState {
     fn handle_event(&mut self, event: Event) -> Result<()> {
         let loop_start = Instant::now();
         // NOTE: don't count blocking select! call as a loop-turn time
-        let _p = profile("GlobalState::handle_event");
+        let _p = profile::span("GlobalState::handle_event");
 
         log::info!("handle_event({:?})", event);
         let queue_count = self.task_pool.handle.len();
@@ -204,7 +203,7 @@ impl GlobalState {
                 self.analysis_host.maybe_collect_garbage();
             }
             Event::Vfs(mut task) => {
-                let _p = profile("GlobalState::handle_event/vfs");
+                let _p = profile::span("GlobalState::handle_event/vfs");
                 loop {
                     match task {
                         vfs::loader::Message::Loaded { files } => {
diff --git a/crates/rust-analyzer/src/reload.rs b/crates/rust-analyzer/src/reload.rs
index 1907f2f13..f74f2c02c 100644
--- a/crates/rust-analyzer/src/reload.rs
+++ b/crates/rust-analyzer/src/reload.rs
@@ -4,7 +4,6 @@ use std::{mem, sync::Arc};
 use flycheck::FlycheckHandle;
 use ra_db::{CrateGraph, SourceRoot, VfsPath};
 use ra_ide::AnalysisChange;
-use ra_prof::profile;
 use ra_project_model::{ProcMacroClient, ProjectWorkspace};
 use vfs::{file_set::FileSetConfig, AbsPath, AbsPathBuf, ChangeKind};
 
@@ -17,7 +16,7 @@ use crate::{
 
 impl GlobalState {
     pub(crate) fn update_configuration(&mut self, config: Config) {
-        let _p = profile("GlobalState::update_configuration");
+        let _p = profile::span("GlobalState::update_configuration");
         let old_config = mem::replace(&mut self.config, config);
         if self.config.lru_capacity != old_config.lru_capacity {
             self.analysis_host.update_lru_capacity(old_config.lru_capacity);
@@ -115,7 +114,7 @@ impl GlobalState {
         });
     }
     pub(crate) fn switch_workspaces(&mut self, workspaces: Vec<anyhow::Result<ProjectWorkspace>>) {
-        let _p = profile("GlobalState::switch_workspaces");
+        let _p = profile::span("GlobalState::switch_workspaces");
         log::info!("reloading projects: {:?}", self.config.linked_projects);
 
         let mut has_errors = false;
@@ -300,7 +299,7 @@ pub(crate) struct SourceRootConfig {
 
 impl SourceRootConfig {
     pub(crate) fn partition(&self, vfs: &vfs::Vfs) -> Vec<SourceRoot> {
-        let _p = profile("SourceRootConfig::partition");
+        let _p = profile::span("SourceRootConfig::partition");
         self.fsc
             .partition(vfs)
             .into_iter()
diff --git a/crates/rust-analyzer/tests/heavy_tests/support.rs b/crates/rust-analyzer/tests/heavy_tests/support.rs
index f242c8165..15866fbb1 100644
--- a/crates/rust-analyzer/tests/heavy_tests/support.rs
+++ b/crates/rust-analyzer/tests/heavy_tests/support.rs
@@ -62,7 +62,7 @@ impl<'a> Project<'a> {
         static INIT: Once = Once::new();
         INIT.call_once(|| {
             env_logger::builder().is_test(true).try_init().unwrap();
-            ra_prof::init_from(crate::PROFILE);
+            profile::init_from(crate::PROFILE);
         });
 
         for entry in Fixture::parse(self.fixture) {