linux-kernel - Re: PEBS (in perf) stopped working from 3.6 -> 3.7

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Date:	Sat, 5 Jan 2013 02:05:01 +0100
From:	"Steinar H. Gunderson" <sgunderson@...foot.com>
To:	David Ahern <dsahern@...il.com>
Cc:	linux-kernel@...r.kernel.org
Subject: Re: PEBS (in perf) stopped working from 3.6 -> 3.7

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?

/* Steinar */
-- 
Homepage: http://www.sesse.net/
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