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Message-ID: <20090625091324.GA16860@elte.hu> Date: Thu, 25 Jun 2009 11:13:24 +0200 From: Ingo Molnar <mingo@...e.hu> To: Peter Zijlstra <a.p.zijlstra@...llo.nl> Cc: Vince Weaver <vince@...ter.net>, Paul Mackerras <paulus@...ba.org>, linux-kernel@...r.kernel.org Subject: Re: performance counter 20% error finding retired instruction count * Peter Zijlstra <a.p.zijlstra@...llo.nl> wrote: > On Wed, 2009-06-24 at 22:12 -0400, Vince Weaver wrote: > > > > It's also nice to be able to skip the loader overhead, as the > > loader can change from system to system and makes it hard to > > compare counters across various machines. Though it sounds like > > the perf utility isn't going to be supporting this anytime soon. > > Feel free to contribute such if you think its important. I'd be glad to review and test any resulting patches from Vince - and/or help out with pointers where to start and help out there's any roadblocks along the way. The kernel side bits can be found in v2.6.31-rc1, in kernel/perf_counter.c, include/linux/perf_counter.h and arch/x86/kernel/cpu/perf_counter.c. We tried to keep the code as hackable as possible. The tooling bits can be found in tools/perf/ in the kernel repo. builtin-stat.c contains the 'perf stat' bits. Thanks, Ingo -- To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to majordomo@...r.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/
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