From: Peter Zijlstra <peterz@infradead.org>
To: eranian@gmail.com
Cc: Corey Ashford <cjashfor@linux.vnet.ibm.com>,
LKML <linux-kernel@vger.kernel.org>,
Paul Mackerras <paulus@samba.org>,
eranian@google.com
Subject: Re: [BUG] perf_event: when events are grouped, the time enabled / running values are incorrect
Date: Tue, 11 May 2010 22:11:16 +0200 [thread overview]
Message-ID: <1273608676.1810.61.camel@laptop> (raw)
In-Reply-To: <h2i7c86c4471005111255ke689a7acz3a9bbb80480235b0@mail.gmail.com>
On Tue, 2010-05-11 at 21:55 +0200, stephane eranian wrote:
> Events are also grouped in this example. Both this same issue exists
> also when only
> one event is used. I suspect an update_event_times() or
> update_group_times() is also
> missing on the sampling path in perf_overflow_handler().
Hrmm, you're right, except fixing that is non-trivial.
update_event_times() wants to be called with ctx->lock held and we can't
do that from NMI context.
next prev parent reply other threads:[~2010-05-11 20:11 UTC|newest]
Thread overview: 15+ messages / expand[flat|nested] mbox.gz Atom feed top
2010-05-08 1:56 [BUG] perf_event: when events are grouped, the time enabled / running values are incorrect Corey Ashford
2010-05-08 2:24 ` Corey Ashford
2010-05-11 14:42 ` Peter Zijlstra
2010-05-11 15:43 ` [tip:perf/core] perf: Fix exit() vs event-groups tip-bot for Peter Zijlstra
2010-05-11 19:55 ` [BUG] perf_event: when events are grouped, the time enabled / running values are incorrect stephane eranian
2010-05-11 20:11 ` Peter Zijlstra [this message]
2010-05-11 20:23 ` Stephane Eranian
2010-05-11 20:27 ` Peter Zijlstra
2010-05-12 17:25 ` Corey Ashford
2010-05-12 17:50 ` Peter Zijlstra
2010-05-12 18:15 ` Corey Ashford
2010-05-12 18:42 ` Corey Ashford
2010-05-13 0:10 ` Paul Mackerras
2010-05-13 10:17 ` Paul Mackerras
2010-05-13 17:37 ` Corey Ashford
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