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

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Message-ID: <50E770DB.2050803@gmail.com>
Date:	Fri, 04 Jan 2013 17:16:27 -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 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
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