Add opt-in mimalloc feature

Cargo.lock

@@ -214,6 +214,15 @@ dependencies = [
  "bitflags",
 ]
 
+[[package]]
+name = "cmake"
+version = "0.1.44"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "0e56268c17a6248366d66d4a47a3381369d068cce8409bb1716ed77ea32163bb"
+dependencies = [
+ "cc",
+]
+
 [[package]]
 name = "console"
 version = "0.11.3"
@@ -674,6 +683,15 @@ dependencies = [
  "winapi 0.3.9",
 ]
 
+[[package]]
+name = "libmimalloc-sys"
+version = "0.1.15"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "a27252ec1d0c4e0dd6142cbc572da50b363ab56fc334f7aa8fadf295b2e24e74"
+dependencies = [
+ "cmake",
+]
+
 [[package]]
 name = "linked-hash-map"
 version = "0.5.3"
@@ -770,6 +788,15 @@ dependencies = [
  "autocfg",
 ]
 
+[[package]]
+name = "mimalloc"
+version = "0.1.19"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "6c52de2069999f01bd26436564dbe7de3a87898feeb7a0d0ff9eb20a05bb7ca0"
+dependencies = [
+ "libmimalloc-sys",
+]
+
 [[package]]
 name = "miniz_oxide"
 version = "0.4.0"
@@ -1248,6 +1275,7 @@ dependencies = [
  "backtrace",
  "jemalloc-ctl",
  "jemallocator",
+ "mimalloc",
  "once_cell",
  "ra_arena",
 ]

crates/ra_prof/Cargo.toml

@@ -12,6 +12,7 @@ doctest = false
 ra_arena = { path = "../ra_arena" }
 once_cell = "1.3.1"
 backtrace = { version = "0.3.44", optional = true }
+mimalloc = { version = "0.1.19", default-features = false, optional = true }
 
 [target.'cfg(not(target_env = "msvc"))'.dependencies]
 jemallocator = { version = "0.3.2", optional = true }
@@ -24,4 +25,5 @@ cpu_profiler = []
 # Uncomment to enable for the whole crate graph
 # default = [ "backtrace" ]
 # default = [ "jemalloc" ]
+# default = [ "mimalloc" ]
 # default = [ "cpu_profiler" ]

crates/ra_prof/src/lib.rs

@@ -19,6 +19,10 @@ pub use crate::{
 #[global_allocator]
 static ALLOC: jemallocator::Jemalloc = jemallocator::Jemalloc;
 
+#[cfg(all(feature = "mimalloc"))]
+#[global_allocator]
+static ALLOC: mimalloc::MiMalloc = mimalloc::MiMalloc;
+
 /// Prints backtrace to stderr, useful for debugging.
 #[cfg(feature = "backtrace")]
 pub fn print_backtrace() {

crates/rust-analyzer/Cargo.toml

@@ -65,3 +65,4 @@ tt = { path = "../ra_tt", package = "ra_tt" }
 
 [features]
 jemalloc = [ "ra_prof/jemalloc" ]
+mimalloc = [ "ra_prof/mimalloc" ]

xtask/src/install.rs

@@ -19,7 +19,13 @@ pub enum ClientOpt {
 }
 
 pub struct ServerOpt {
-    pub jemalloc: bool,
+    pub malloc: Malloc,
+}
+
+pub enum Malloc {
+    System,
+    Jemalloc,
+    Mimalloc,
 }
 
 impl InstallCmd {
@@ -130,8 +136,12 @@ fn install_server(opts: ServerOpt) -> Result<()> {
         )
     }
 
-    let jemalloc = if opts.jemalloc { "--features jemalloc" } else { "" };
+    let malloc_feature = match opts.malloc {
-    let res = run!("cargo install --path crates/rust-analyzer --locked --force {}", jemalloc);
+        Malloc::System => "",
+        Malloc::Jemalloc => "--features jemalloc",
+        Malloc::Mimalloc => "--features mimalloc",
+    };
+    let res = run!("cargo install --path crates/rust-analyzer --locked --force {}", malloc_feature);
 
     if res.is_err() && old_rust {
         eprintln!(

xtask/src/main.rs

@@ -14,7 +14,7 @@ use pico_args::Arguments;
 use xtask::{
     codegen::{self, Mode},
     dist::run_dist,
-    install::{ClientOpt, InstallCmd, ServerOpt},
+    install::{ClientOpt, InstallCmd, Malloc, ServerOpt},
     not_bash::pushd,
     pre_commit, project_root,
     release::{PromoteCmd, ReleaseCmd},
@@ -46,6 +46,7 @@ FLAGS:
         --client-code    Install only VS Code plugin
         --server         Install only the language server
         --jemalloc       Use jemalloc for server
+        --mimalloc       Use mimalloc for server
     -h, --help           Prints help information
         "
                 );
@@ -61,13 +62,21 @@ FLAGS:
                 return Ok(());
             }
 
-            let jemalloc = args.contains("--jemalloc");
+            let malloc = match (args.contains("--jemalloc"), args.contains("--mimalloc")) {
+                (false, false) => Malloc::System,
+                (true, false) => Malloc::Jemalloc,
+                (false, true) => Malloc::Mimalloc,
+                (true, true) => {
+                    eprintln!("error: Cannot use both `--jemalloc` and `--mimalloc`");
+                    return Ok(());
+                }
+            };
 
             args.finish()?;
 
             InstallCmd {
                 client: if server { None } else { Some(ClientOpt::VsCode) },
-                server: if client_code { None } else { Some(ServerOpt { jemalloc }) },
+                server: if client_code { None } else { Some(ServerOpt { malloc }) },
             }
             .run()
         }