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From: Stephane Eranian on 21 Apr 2010 14:50 On Wed, Apr 21, 2010 at 8:26 PM, Robert Richter <robert.richter(a)amd.com> wrote: > On 21.04.10 15:21:35, Stephane Eranian wrote: >> Okay, so you're suggesting everything is exposed via PERF_SAMPLE_REGS. >> PEBS does capture machine state which is easily mapped onto PERF_SAMPLE_REGS. >> Well, that's until you look at PEB-LL on Nehalem where is captures >> latencies and data >> addresses. >> >> Those could be funneled through PERF_SAMPLE_REGS >> as well, I believe. But that means, PERF_SAMPLE_REGS would need some >> configuration >> bitmask to name the registers of interest, e.g. EAX, EDX, IBSOP_DATA, >> IBSOP_PHYSAD, >> and so on. > > What is the idea of PERF_SAMPLE_REGS? A git grep PERF_SAMPLE_REGS only > returns a single line in -tip. I know nothing about it. > You may want to collect some of the general purpose registers (interrupted state) in each sample. This is what you get today in a signal handler (ucontext) for instance. That may also be a way to export PEBS samples. -- To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to majordomo(a)vger.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/
From: Robert Richter on 21 Apr 2010 14:50
On 21.04.10 15:21:35, Stephane Eranian wrote: > Okay, so you're suggesting everything is exposed via PERF_SAMPLE_REGS. > PEBS does capture machine state which is easily mapped onto PERF_SAMPLE_REGS. > Well, that's until you look at PEB-LL on Nehalem where is captures > latencies and data > addresses. > > Those could be funneled through PERF_SAMPLE_REGS > as well, I believe. But that means, PERF_SAMPLE_REGS would need some > configuration > bitmask to name the registers of interest, e.g. EAX, EDX, IBSOP_DATA, > IBSOP_PHYSAD, > and so on. What is the idea of PERF_SAMPLE_REGS? A git grep PERF_SAMPLE_REGS only returns a single line in -tip. I know nothing about it. -Robert -- Advanced Micro Devices, Inc. Operating System Research Center email: robert.richter(a)amd.com -- To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to majordomo(a)vger.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/ |