Messages in this thread | | | Subject | Re: [PATCH v3 10/30] perf clang: Add builtin clang support ant test case | From | "Wangnan (F)" <> | Date | Mon, 5 Dec 2016 10:36:02 +0800 |
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On 2016/12/2 23:44, Arnaldo Carvalho de Melo wrote: > Em Sat, Nov 26, 2016 at 07:03:34AM +0000, Wang Nan escreveu: >> Add basic clang support in clang.cpp and test__clang() testcase. The >> first testcase checks if builtin clang is able to generate LLVM IR. >> >> tests/clang.c is a proxy. Real testcase resides in >> utils/c++/clang-test.cpp in c++ and exports C interface to perf test >> subsystem. >> >> Test result: >> >> $ perf test -v clang >> 51: Test builtin clang support : >> 51.1: Test builtin clang compile C source to IR : >> --- start --- >> test child forked, pid 13215 >> test child finished with 0 >> ---- end ---- >> Test builtin clang support subtest 0: Ok > While testing this I noticed that the perf binary got huge, can't this > be done in some other way, i.e. using dynamic library?
I intentionally use statically linking because it is good for smartphone: we can simply 'adb push' a statically linked perf to Android.
The resulting ELF executable would be even larger if LLVM is built with default setting.
In my setting the resuling 'perf' is less than 60MB:
$ ls -s ~/perf -h 58M /home/wn/perf
$ size ~/perf text data bss dec hex filename 56931273 2950808 24108632 83990713 50198b9 /home/wn/perf
It is reasonable for me.
I think using dynamic clang and llvm libraries is possible but I never tried it before. It depend on LLVM compiling. I think if distro provides shared libraries then perf can utilize them automatically. Let me check it today.
About the file size, I discussed with Alexei, he taught me a lot on it. Maybe he or his ioVisor ex-colleagues can provide some new idea?
Thank you.
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