Auto merge of #62340 - gnzlbg:mimalloc, r=<try>

[WIP] Switch rustc allocator to mimalloc

[Here](https://www.microsoft.com/en-us/research/publication/mimalloc-free-list-sharding-in-action/), strong claims are made about the performance of mimalloc against pretty much every other widely-used allocator.

This PR is the smallest-diff that hopefully allows us to do a perf run of rustc with mimalloc.

Independently of the outcome, this is not intended to be merged upstream - hence tagged as WIP to prevent that.

r? @Zoxc

Author: bors

Cargo.lock

@@ -992,11 +992,6 @@ dependencies = [
  "winapi 0.3.6 (registry+https://github.com/rust-lang/crates.io-index)",
 ]
 
-[[package]]
-name = "fs_extra"
-version = "1.1.0"
-source = "registry+https://github.com/rust-lang/crates.io-index"
-
 [[package]]
 name = "fst"
 version = "0.3.0"
@@ -1317,16 +1312,6 @@ name = "itoa"
 version = "0.4.4"
 source = "registry+https://github.com/rust-lang/crates.io-index"
 
-[[package]]
-name = "jemalloc-sys"
-version = "0.3.0"
-source = "registry+https://github.com/rust-lang/crates.io-index"
-dependencies = [
- "cc 1.0.35 (registry+https://github.com/rust-lang/crates.io-index)",
- "fs_extra 1.1.0 (registry+https://github.com/rust-lang/crates.io-index)",
- "libc 0.2.54 (registry+https://github.com/rust-lang/crates.io-index)",
-]
-
 [[package]]
 name = "jobserver"
 version = "0.1.13"
@@ -1633,6 +1618,15 @@ name = "memoffset"
 version = "0.2.1"
 source = "registry+https://github.com/rust-lang/crates.io-index"
 
+[[package]]
+name = "mimalloc-sys"
+version = "0.1.2"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+dependencies = [
+ "cc 1.0.35 (registry+https://github.com/rust-lang/crates.io-index)",
+ "libc 0.2.54 (registry+https://github.com/rust-lang/crates.io-index)",
+]
+
 [[package]]
 name = "minifier"
 version = "0.0.30"
@@ -2642,7 +2636,7 @@ dependencies = [
 name = "rustc-main"
 version = "0.0.0"
 dependencies = [
- "jemalloc-sys 0.3.0 (registry+https://github.com/rust-lang/crates.io-index)",
+ "mimalloc-sys 0.1.2 (registry+https://github.com/rust-lang/crates.io-index)",
  "rustc_codegen_ssa 0.0.0",
  "rustc_driver 0.0.0",
  "rustc_target 0.0.0",
@@ -4296,7 +4290,6 @@ source = "registry+https://github.com/rust-lang/crates.io-index"
 "checksum foreign-types-shared 0.1.1 (registry+https://github.com/rust-lang/crates.io-index)" = "00b0228411908ca8685dba7fc2cdd70ec9990a6e753e89b6ac91a84c40fbaf4b"
 "checksum fortanix-sgx-abi 0.3.2 (registry+https://github.com/rust-lang/crates.io-index)" = "3f8cbee5e872cf7db61a999a041f9bc4706ca7bf7df4cb914f53fabb1c1bc550"
 "checksum fs2 0.4.3 (registry+https://github.com/rust-lang/crates.io-index)" = "9564fc758e15025b46aa6643b1b77d047d1a56a1aea6e01002ac0c7026876213"
-"checksum fs_extra 1.1.0 (registry+https://github.com/rust-lang/crates.io-index)" = "5f2a4a2034423744d2cc7ca2068453168dcdb82c438419e639a26bd87839c674"
 "checksum fst 0.3.0 (registry+https://github.com/rust-lang/crates.io-index)" = "d94485a00b1827b861dd9d1a2cc9764f9044d4c535514c0760a5a2012ef3399f"
 "checksum fuchsia-cprng 0.1.1 (registry+https://github.com/rust-lang/crates.io-index)" = "a06f77d526c1a601b7c4cdd98f54b5eaabffc14d5f2f0296febdc7f357c6d3ba"
 "checksum fuchsia-zircon 0.3.3 (registry+https://github.com/rust-lang/crates.io-index)" = "2e9763c69ebaae630ba35f74888db465e49e259ba1bc0eda7d06f4a067615d82"
@@ -4331,7 +4324,6 @@ source = "registry+https://github.com/rust-lang/crates.io-index"
 "checksum itertools 0.7.8 (registry+https://github.com/rust-lang/crates.io-index)" = "f58856976b776fedd95533137617a02fb25719f40e7d9b01c7043cd65474f450"
 "checksum itertools 0.8.0 (registry+https://github.com/rust-lang/crates.io-index)" = "5b8467d9c1cebe26feb08c640139247fac215782d35371ade9a2136ed6085358"
 "checksum itoa 0.4.4 (registry+https://github.com/rust-lang/crates.io-index)" = "501266b7edd0174f8530248f87f99c88fbe60ca4ef3dd486835b8d8d53136f7f"
-"checksum jemalloc-sys 0.3.0 (registry+https://github.com/rust-lang/crates.io-index)" = "7bef0d4ce37578dfd80b466e3d8324bd9de788e249f1accebb0c472ea4b52bdc"
 "checksum jobserver 0.1.13 (registry+https://github.com/rust-lang/crates.io-index)" = "b3d51e24009d966c8285d524dbaf6d60926636b2a89caee9ce0bd612494ddc16"
 "checksum json 0.11.13 (registry+https://github.com/rust-lang/crates.io-index)" = "9ad0485404155f45cce53a40d4b2d6ac356418300daed05273d9e26f91c390be"
 "checksum jsonrpc-core 12.0.0 (registry+https://github.com/rust-lang/crates.io-index)" = "288dca7f9713710a29e485076b9340156cb701edb46a881f5d0c31aa4f5b9143"
@@ -4362,6 +4354,7 @@ source = "registry+https://github.com/rust-lang/crates.io-index"
 "checksum memchr 2.2.0 (registry+https://github.com/rust-lang/crates.io-index)" = "2efc7bc57c883d4a4d6e3246905283d8dae951bb3bd32f49d6ef297f546e1c39"
 "checksum memmap 0.6.2 (registry+https://github.com/rust-lang/crates.io-index)" = "e2ffa2c986de11a9df78620c01eeaaf27d94d3ff02bf81bfcca953102dd0c6ff"
 "checksum memoffset 0.2.1 (registry+https://github.com/rust-lang/crates.io-index)" = "0f9dc261e2b62d7a622bf416ea3c5245cdd5d9a7fcc428c0d06804dfce1775b3"
+"checksum mimalloc-sys 0.1.2 (registry+https://github.com/rust-lang/crates.io-index)" = "06bd52565989827e0d9342099892ef07703b66aba1c811ddb85c6aaaca23b04a"
 "checksum minifier 0.0.30 (registry+https://github.com/rust-lang/crates.io-index)" = "4c909e78edf61f3aa0dd2086da168cdf304329044bbf248768ca3d20253ec8c0"
 "checksum miniz-sys 0.1.11 (registry+https://github.com/rust-lang/crates.io-index)" = "0300eafb20369952951699b68243ab4334f4b10a88f411c221d444b36c40e649"
 "checksum miniz_oxide 0.2.0 (registry+https://github.com/rust-lang/crates.io-index)" = "5ad30a47319c16cde58d0314f5d98202a80c9083b5f61178457403dfb14e509c"

src/rustc/Cargo.toml

@@ -16,10 +16,14 @@ rustc_driver = { path = "../librustc_driver" }
 # crate is intended to be used by codegen backends, which may not be in-tree.
 rustc_codegen_ssa = { path = "../librustc_codegen_ssa" }
 
-[dependencies.jemalloc-sys]
-version = '0.3.0'
+#[dependencies.jemalloc-sys]
+#version = '0.3.0'
+#optional = true
+#features = ['unprefixed_malloc_on_supported_platforms']
+
+[dependencies.mimalloc-sys]
+version = '0.1.4'
 optional = true
-features = ['unprefixed_malloc_on_supported_platforms']
 
 [features]
-jemalloc = ['jemalloc-sys']
+jemalloc = ['mimalloc-sys', 'mimalloc-sys/override']

src/rustc/rustc.rs

@@ -1,34 +1,34 @@
 fn main() {
-    // Pull in jemalloc when enabled.
+    // Pull in mimalloc when enabled.
     //
-    // Note that we're pulling in a static copy of jemalloc which means that to
+    // Note that we're pulling in a static copy of mimalloc which means that to
     // pull it in we need to actually reference its symbols for it to get
     // linked. The two crates we link to here, std and rustc_driver, are both
-    // dynamic libraries. That means to pull in jemalloc we need to actually
+    // dynamic libraries. That means to pull in mimalloc we need to actually
     // reference allocation symbols one way or another (as this file is the only
     // object code in the rustc executable).
-    #[cfg(feature = "jemalloc-sys")]
+    #[cfg(feature = "mimalloc-sys")]
     {
         use std::os::raw::{c_void, c_int};
 
         #[used]
         static _F1: unsafe extern fn(usize, usize) -> *mut c_void =
-            jemalloc_sys::calloc;
+            mimalloc_sys::calloc;
         #[used]
         static _F2: unsafe extern fn(*mut *mut c_void, usize, usize) -> c_int =
-            jemalloc_sys::posix_memalign;
+            mimalloc_sys::posix_memalign;
         #[used]
         static _F3: unsafe extern fn(usize, usize) -> *mut c_void =
-            jemalloc_sys::aligned_alloc;
+            mimalloc_sys::aligned_alloc;
         #[used]
         static _F4: unsafe extern fn(usize) -> *mut c_void =
-            jemalloc_sys::malloc;
+            mimalloc_sys::malloc;
         #[used]
         static _F5: unsafe extern fn(*mut c_void, usize) -> *mut c_void =
-            jemalloc_sys::realloc;
+            mimalloc_sys::realloc;
         #[used]
         static _F6: unsafe extern fn(*mut c_void) =
-            jemalloc_sys::free;
+            mimalloc_sys::free;
     }
 
     rustc_driver::set_sigpipe_handler();