From: David Ahern <dsahern@gmail.com>
To: "Steinar H. Gunderson" <sgunderson@bigfoot.com>
Cc: linux-kernel@vger.kernel.org
Subject: Re: PEBS (in perf) stopped working from 3.6 -> 3.7
Date: Fri, 04 Jan 2013 17:16:27 -0700 [thread overview]
Message-ID: <50E770DB.2050803@gmail.com> (raw)
In-Reply-To: <20130104234743.GA12331@uio.no>
On 1/4/13 4:47 PM, Steinar H. Gunderson wrote:
> [Please Cc me on any replies; I'm not subscribed to lkml]
>
> Hi,
>
> I recently upgraded from 3.6.5 to 3.7.1 to get around some MM issues that
> have been bothering me. However, it appears it broke PEBS:
>
> pannekake:/usr/src/linux-3.7.1# perf record -a -e cycles:pp
>
> Error: sys_perf_event_open() syscall returned with 95 (Operation not supported). /bin/dmesg may provide additional information.
>
> Fatal: No hardware sampling interrupt available. No APIC? If so then you can boot the kernel with the "lapic" boot parameter to force-enable it.
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
David
next prev parent reply other threads:[~2013-01-05 0:16 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 [this message]
2013-01-05 0:21 ` Steinar H. Gunderson
2013-01-05 1:05 ` Steinar H. Gunderson
2013-01-07 3:48 ` David Ahern
2013-01-07 14:40 ` Steinar H. Gunderson
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