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Date: Fri, 31 Jul 2020 12:42:17 +0200 From: Sedat Dilek <sedat.dilek@...il.com> To: Arnaldo Carvalho de Melo <arnaldo.melo@...il.com> Cc: Peter Zijlstra <peterz@...radead.org>, Ingo Molnar <mingo@...hat.com>, Mark Rutland <mark.rutland@....com>, Alexander Shishkin <alexander.shishkin@...ux.intel.com>, Jiri Olsa <jolsa@...hat.com>, Namhyung Kim <namhyung@...nel.org>, linux-kernel@...r.kernel.org, Arnd Bergmann <arnd@...db.de> Subject: Re: [perf] Explicitly use python[3]-[config] > Please let me know if you need further help. > > - Arnaldo Hi Arnaldo, YES, I need further help. I have published in [1] numbers for "perf stat make ..." with GNU/gcc+binutils vs. LLVM toolchain for building Linux v5.8-rc7. [ GNU/gcc+binutils toolchain ] 10964.876434769 seconds time elapsed 29666.464675000 seconds user 2149.943729000 seconds sys [ LLVM toolchain ] 17149.393417675 seconds time elapsed 47787.158036000 seconds user 2289.196142000 seconds sys How can I dig further to see why the time for user is higher when building with LLVM toolchain? Any suggestions? Thanks. Regards, - Sedat - [1] https://github.com/ClangBuiltLinux/linux/issues/1086#issuecomment-667036028
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