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rust/compiler/rustc_codegen_ssa
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Guillaume Gomez 6b5e141999
Rollup merge of #82535 - wesleywiser:wip_codegen_thread_names, r=nagisa 
Set codegen thread names

Set names on threads spawned during codegen. Various debugging and profiling tools can take advantage of this to show a more useful identifier for threads.

For example, gdb will show thread names in `info threads`:

```
(gdb) info threads
  Id   Target Id                                          Frame
  1    Thread 0x7fffefa7ec40 (LWP 2905) "rustc"           __pthread_clockjoin_ex (threadid=140737214134016, thread_return=0x0, clockid=<optimized out>, abstime=<optimized out>, block=<optimized out>)
    at pthread_join_common.c:145
  2    Thread 0x7fffefa7b700 (LWP 2957) "rustc"           0x00007ffff125eaa8 in llvm::X86_MC::initLLVMToSEHAndCVRegMapping(llvm::MCRegisterInfo*) ()
   from /home/wesley/.rustup/toolchains/stage1/lib/librustc_driver-f866439e29074957.so
  3    Thread 0x7fffeef0f700 (LWP 3116) "rustc"           futex_wait_cancelable (private=0, expected=0, futex_word=0x7fffe8602ac8) at ../sysdeps/nptl/futex-internal.h:183
* 4    Thread 0x7fffeed0e700 (LWP 3123) "rustc"           rustc_codegen_ssa:🔙:write::spawn_work (cgcx=..., work=...) at /home/wesley/code/rust/rust/compiler/rustc_codegen_ssa/src/back/write.rs:1573
  6    Thread 0x7fffe113b700 (LWP 3150) "opt foof.7rcbfp" 0x00007ffff2940e62 in llvm::CallGraph::populateCallGraphNode(llvm::CallGraphNode*) ()
   from /home/wesley/.rustup/toolchains/stage1/lib/librustc_driver-f866439e29074957.so
  8    Thread 0x7fffe0d39700 (LWP 3158) "opt foof.7rcbfp" 0x00007fffefe8998e in malloc_consolidate (av=av@entry=0x7ffe2c000020) at malloc.c:4492
  9    Thread 0x7fffe0f3a700 (LWP 3162) "opt foof.7rcbfp" 0x00007fffefef27c4 in __libc_open64 (file=0x7fffe0f38608 "foof.foof.7rcbfp3g-cgu.6.rcgu.o", oflag=524865) at ../sysdeps/unix/sysv/linux/open64.c:48
(gdb)
```

and Windows Performance Analyzer will also show this information when profiling:

![image](https://user-images.githubusercontent.com/831192/109231017-d311f780-7793-11eb-8072-ab836a830e90.png)
2021-02-26 15:52:35 +01:00
..
src Rollup merge of #82535 - wesleywiser:wip_codegen_thread_names, r=nagisa 2021-02-26 15:52:35 +01:00
Cargo.toml rustc_codegen_ssa: tune codegen according to available concurrency 2021-02-15 13:02:49 -08:00
README.md

README.md

Please read the rustc-dev-guide chapter on Backend Agnostic Codegen.