Move memory usage statistics to ra_prof

1 files changed, 52 insertions, 0 deletions

diff --git a/crates/ra_prof/src/memory_usage.rs b/crates/ra_prof/src/memory_usage.rs
new file mode 100644
index 000000000..2bde8fb5f
--- /dev/null
+++ b/crates/ra_prof/src/memory_usage.rs
@@ -0,0 +1,52 @@
+use std::fmt;
+
+pub struct MemoryUsage {
+    pub allocated: Bytes,
+    pub resident: Bytes,
+}
+
+impl MemoryUsage {
+    #[cfg(feature = "jemalloc")]
+    pub fn current() -> MemoryUsage {
+        jemalloc_ctl::epoch().unwrap();
+        MemoryUsage {
+            allocated: Bytes(jemalloc_ctl::stats::allocated().unwrap()),
+            resident: Bytes(jemalloc_ctl::stats::resident().unwrap()),
+        }
+    }
+
+    #[cfg(not(feature = "jemalloc"))]
+    pub fn current() -> MemoryUsage {
+        MemoryUsage { allocated: Bytes(0), resident: Bytes(0) }
+    }
+}
+
+impl fmt::Display for MemoryUsage {
+    fn fmt(&self, fmt: &mut fmt::Formatter) -> fmt::Result {
+        write!(fmt, "{} allocated {} resident", self.allocated, self.resident,)
+    }
+}
+
+#[derive(Default)]
+pub struct Bytes(usize);
+
+impl fmt::Display for Bytes {
+    fn fmt(&self, f: &mut fmt::Formatter) -> fmt::Result {
+        let bytes = self.0;
+        if bytes < 4096 {
+            return write!(f, "{} bytes", bytes);
+        }
+        let kb = bytes / 1024;
+        if kb < 4096 {
+            return write!(f, "{}kb", kb);
+        }
+        let mb = kb / 1024;
+        write!(f, "{}mb", mb)
+    }
+}
+
+impl std::ops::AddAssign<usize> for Bytes {
+    fn add_assign(&mut self, x: usize) {
+        self.0 += x;
+    }
+}