From: "Steinar H. Gunderson" <sgunderson@bigfoot.com>
To: linux-kernel@vger.kernel.org
Subject: PEBS (in perf) stopped working from 3.6 -> 3.7
Date: Sat, 5 Jan 2013 00:47:43 +0100 [thread overview]
Message-ID: <20130104234743.GA12331@uio.no> (raw)
[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.
Non-precise tracing works fine. This used to work in 3.6.5, and I used make
oldconfig (not that I can find any .config settings that would seem relevant
either). I certainly have APIC. There's nothing in dmesg about the error.
I'm using perf built from the same kernel tree (ie., 3.7.1).
This is on a dual Xeon E5520 (ie. Westmere), on a Supermicro board.
/* Steinar */
--
Chief, Tech:Server
http://www.sesse.net/
next reply other threads:[~2013-01-05 0:10 UTC|newest]
Thread overview: 6+ messages / expand[flat|nested] mbox.gz Atom feed top
2013-01-04 23:47 Steinar H. Gunderson [this message]
2013-01-05 0:16 ` PEBS (in perf) stopped working from 3.6 -> 3.7 David Ahern
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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