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Message-ID: <50EA4594.9020309@gmail.com> Date: Sun, 06 Jan 2013 20:48:36 -0700 From: David Ahern <dsahern@...il.com> To: "Steinar H. Gunderson" <sgunderson@...foot.com> CC: linux-kernel@...r.kernel.org Subject: Re: PEBS (in perf) stopped working from 3.6 -> 3.7 On 1/4/13 6:05 PM, Steinar H. Gunderson wrote: > On Fri, Jan 04, 2013 at 05:16:27PM -0700, David Ahern wrote: >> Known problem. Pick one of: update perf to 3.7, add H to the command >> (-e cycles:ppH) or apply this patch: >> https://lkml.org/lkml/2012/12/28/384 > > I spoke too soon. This works for cycles, but not for branch-misses: > > pannekake:~> sudo perf record -e branch-misses:ppH -a > > Error: sys_perf_event_open() syscall returned with 95 (Operation not supported) for event branch-misses:ppH. /bin/dmesg may provide additional information. > > No hardware sampling interrupt available. No APIC? If so then you can boot the kernel with the "lapic" boot parameter to force-enable it. > > Why would the two be different? I will make a guess that is processor dependent. On an E5540 with 3.4.11-1.fc16.x86_64, 3.6.10-2.fc16.x86_64, and 3.8 I get the same failure message. But on a E5620, it works fine with 3.4 and 3.7 (no intermediate kernels on that box). David -- 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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