From: "Steinar H. Gunderson" <sgunderson@bigfoot.com>
To: David Ahern <dsahern@gmail.com>
Cc: linux-kernel@vger.kernel.org
Subject: Re: PEBS (in perf) stopped working from 3.6 -> 3.7
Date: Sat, 5 Jan 2013 02:05:01 +0100 [thread overview]
Message-ID: <20130105010501.GA5371@uio.no> (raw)
In-Reply-To: <50E770DB.2050803@gmail.com>
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/
next prev parent reply other threads:[~2013-01-05 1:05 UTC|newest]
Thread overview: 6+ messages / expand[flat|nested] mbox.gz Atom feed top
2013-01-04 23:47 PEBS (in perf) stopped working from 3.6 -> 3.7 Steinar H. Gunderson
2013-01-05 0:16 ` David Ahern
2013-01-05 0:21 ` Steinar H. Gunderson
2013-01-05 1:05 ` Steinar H. Gunderson [this message]
2013-01-07 3:48 ` David Ahern
2013-01-07 14:40 ` Steinar H. Gunderson
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