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2016 Dec 10
2
Interest in integrating a linux perf JITEventListener?
Hi, Under linux a large portion of the profiling these days happens with perf, but there's no support for it from LLVM's JITs. For a while perf could associate address+size to symbols by writing a /tmp/perf-$pid.map file: http://git.kernel.org/cgit/linux/kernel/git/torvalds/linux.git/tree/tools/perf/Documentation/jit-interface.txt A year or so perf also gained the ability to actually
2017 Feb 02
0
Interest in integrating a linux perf JITEventListener?
...-i perf.data -o perf.jit.data # and show information perf report -i perf.jit.data Example output: Samples: 3K of event 'cycles:ppp', Event count (approx.): 3127026392 Overhead Command Shared Object Symbol - 93.41% lli jitted-27248-2.so [.] stupid_isprime stupid_isprime main llvm::MCJIT::runFunction llvm::ExecutionEngine::runFunctionAsMain main __libc_start_main 0xec26258d4c544155 + 0.55% lli ld-2.24.so [.] do_lookup_x + 0.22% lli ld-2.24.so [.] _dl...
2018 Mar 26
0
Interest in integrating a linux perf JITEventListener?
...# and show information > perf report -i perf.jit.data > > Example output: > Samples: 3K of event 'cycles:ppp', Event count (approx.): 3127026392 > Overhead Command Shared Object Symbol > - 93.41% lli jitted-27248-2.so [.] stupid_isprime > stupid_isprime > main > llvm::MCJIT::runFunction > llvm::ExecutionEngine::runFunctionAsMain > main > __libc_start_main > 0xec26258d4c544155 > + 0.55% lli ld-2.24.so [.] do_lookup_x > + 0.22% lli...
2016 Dec 29
1
Interest in integrating a linux perf JITEventListener?
Having something like this available in tree would definitely be useful. For simplicity, why don't we start with support for the second style? This is the long term useful one and would be a good starting point for getting the code in tree. Can you give a pointer to the patch so that I can assess the rough complexity? If it's simple enough, I'd be happy to help get it reviewed