[llvm-dev] PerfJITEventListener needs perf-<pid>.map?

[Eugene Zhulenev via llvm-dev]

Figured out how to make it work, thanks to example in
https://reviews.llvm.org/rG39253a50f0f33e491e2d021f94cd3a87ee773f2d


*auto objectLayer = std::make_unique<RTDyldObjectLinkingLayer>(*
*        session, []() { return std::make_unique<SectionMemoryManager>();
});*
*objectLayer->registerJITEventListener(*llvm::JITEventListener::createPerfJITEventListener());*


Previously I was forwarding to JITEventListener::notifyObjectLoaded
from objectLayer->setNotifyLoaded callback.

Eugene

On Fri, Apr 17, 2020 at 10:58 PM Eugene Zhulenev <ezhulenev at google.com>
wrote:

> I'm trying to use PerfJITEventListener with llvm::orc::LLJITBuilder:
>
> 1. perf record -o /tmp/perf.data -- <my_binary_with_event_listener>
> 2. perf inject -j -v -i /tmp/perf.data -o /tmp/perf.data.jit
>
> *jit marker found: ~.debug/jit/llvm-IR-jit-20200417-3c2242/jit-149849.dump*
> *injecting: ~/.debug/jit/llvm-IR-jit-20200417-3c2242/jit-149849.dump*
> *write ELF image
> ~/.debug/jit/llvm-IR-jit-20200417-3c2242/jitted-149849-1.so*
> *write ELF image
> ~/.debug/jit/llvm-IR-jit-20200417-3c2242/jitted-149849-2.so*
> *injected: ~/.debug/jit/llvm-IR-jit-20200417-3c2242/jit-149849.dump (0)*
>
>
> Generated ELF files have correct .text sections.
>
> However perf report can't find these generated so files:
>
> +   69.50%    23.82%  my_binary  [JIT] tid 149849    [.] 0x00007f9c34d5106a
> +   51.78%    45.69%  my_binary  [JIT] tid 149849    [.] 0x00007f9c34d51065
> +   27.71%     6.09%  my_binary  [JIT] tid 149849     [.]
> 0x00007f9c34d51060
>
> It seems that perf report is looking for a shared object
> in /tmp/perf-149849.map, but that file doesn't exist.
>
> Looking at examples in the original LLVM change (
> https://reviews.llvm.org/D44892?), I don't see any mentions of perf.map
> file.
>
> Do I miss something? Are there any examples of how to use perf listener?
>
> Thanks,
> Eugene
>
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