From: David Ahern <dsahern@gmail.com>
To: Gleb Natapov <gleb@redhat.com>
Cc: Linus Torvalds <torvalds@linux-foundation.org>,
Ingo Molnar <mingo@kernel.org>,
Linux Kernel Mailing List <linux-kernel@vger.kernel.org>,
Arnaldo Carvalho de Melo <acme@infradead.org>,
Peter Zijlstra <a.p.zijlstra@chello.nl>,
Thomas Gleixner <tglx@linutronix.de>,
Andrew Morton <akpm@linux-foundation.org>
Subject: Re: [GIT PULL] perf changes for v3.8
Date: Sun, 23 Dec 2012 16:17:45 -0700 [thread overview]
Message-ID: <50D79119.9010002@gmail.com> (raw)
In-Reply-To: <20121223092324.GN17584@redhat.com>
On 12/23/12 2:23 AM, Gleb Natapov wrote:
>> Your patch alone was not enough. Start here:
>> https://lkml.org/lkml/2012/7/12/3
>>
> I cannot reproduce this failure. I reverted 20b279ddb38c and ran "perf
> record -e cycles:ppG" while guest was running. Admittedly I ran the test
> for a short time, but without disabling PEBS during the guest entry this
> was enough to crash a guest.
In the beginning (without any patches) VMs crashed fairly quickly. With
your patch it took longer, but I was able to consistently crash VMs. The
thread notes server info (processor, OS) and VM versions as well as load
used for the tests -- a cpu bound process (openssl), disk bound (dd) and
network (netperf).
> What about forcing exclude_guest on an event that
> has precise flag set without reporting error to userspace?
That's up to the perf maintainers -- Ingo, Peter, Arnaldo. Personally, I
don't like it since kernel side is changing the user request.
David
next prev parent reply other threads:[~2012-12-23 23:17 UTC|newest]
Thread overview: 34+ messages / expand[flat|nested] mbox.gz Atom feed top
2012-12-11 9:09 [GIT PULL] perf changes for v3.8 Ingo Molnar
2012-12-13 2:53 ` Linus Torvalds
2012-12-13 3:02 ` David Ahern
2012-12-13 3:09 ` Linus Torvalds
2012-12-13 3:16 ` David Ahern
2012-12-13 3:25 ` David Ahern
2012-12-13 3:34 ` Linus Torvalds
2012-12-13 3:43 ` David Ahern
2012-12-13 3:51 ` Linus Torvalds
2012-12-13 4:31 ` David Ahern
2012-12-13 4:46 ` Linus Torvalds
2012-12-13 7:27 ` Ingo Molnar
2012-12-13 7:30 ` Ingo Molnar
2012-12-13 14:30 ` David Ahern
2012-12-13 14:38 ` David Ahern
2012-12-13 16:03 ` Linus Torvalds
2012-12-13 16:24 ` David Ahern
2012-12-13 16:33 ` Linus Torvalds
2012-12-13 16:59 ` Ingo Molnar
2012-12-13 17:10 ` Linus Torvalds
2012-12-13 17:31 ` Ingo Molnar
2012-12-17 4:43 ` David Ahern
2012-12-22 19:22 ` David Ahern
2012-12-23 0:00 ` Linus Torvalds
2012-12-13 17:02 ` Linus Torvalds
2012-12-13 17:30 ` David Ahern
2012-12-13 17:36 ` Ingo Molnar
2012-12-13 19:12 ` David Ahern
2012-12-13 7:48 ` [PATCH] Revert "perf: Require exclude_guest to use PEBS - kernel side enforcement" Ingo Molnar
[not found] ` <20121217102000.GE11016@redhat.com>
2012-12-22 19:30 ` [GIT PULL] perf changes for v3.8 David Ahern
2012-12-23 9:23 ` Gleb Natapov
2012-12-23 23:17 ` David Ahern [this message]
2012-12-24 10:36 ` Gleb Natapov
2012-12-13 17:04 ` [PATCH] x86: fix perf build with uclibc toolchains Florian Fainelli
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