From: Oleg Nesterov <oleg@redhat.com>
To: Peter Zijlstra <a.p.zijlstra@chello.nl>
Cc: Jiri Olsa <jolsa@redhat.com>, Paul Mackerras <paulus@samba.org>,
Ingo Molnar <mingo@elte.hu>,
linux-kernel@vger.kernel.org
Subject: Re: [PATCH,RFC] perf: panic due to inclied cpu context task_ctx value
Date: Sat, 26 Mar 2011 18:09:22 +0100 [thread overview]
Message-ID: <20110326170922.GA20329@redhat.com> (raw)
In-Reply-To: <1301157483.2250.366.camel@laptop>
On 03/26, Peter Zijlstra wrote:
>
> diff --git a/kernel/perf_event.c b/kernel/perf_event.c
> index c75925c..e9e4e35 100644
> --- a/kernel/perf_event.c
> +++ b/kernel/perf_event.c
> @@ -1073,6 +1073,8 @@ event_sched_out(struct perf_event *event,
> if (!is_software_event(event))
> cpuctx->active_oncpu--;
> ctx->nr_active--;
> + if (!ctx->nr_active && cpuctx->task_ctx == ctx)
> + cpuctx->task_ctx = NULL;
If we clear cpuctx->task_ctx, we should also clear ctx->is_active.
Otherwise I can't see any problem, but I do not understand this code
enough.
Oleg.
next prev parent reply other threads:[~2011-03-26 17:18 UTC|newest]
Thread overview: 41+ messages / expand[flat|nested] mbox.gz Atom feed top
2011-03-24 16:44 [PATCH,RFC] perf: panic due to inclied cpu context task_ctx value Jiri Olsa
2011-03-25 19:10 ` Oleg Nesterov
2011-03-26 15:37 ` Peter Zijlstra
2011-03-26 16:13 ` Oleg Nesterov
2011-03-26 16:38 ` Peter Zijlstra
2011-03-26 17:09 ` Oleg Nesterov [this message]
2011-03-26 17:35 ` Oleg Nesterov
2011-03-26 18:29 ` Peter Zijlstra
2011-03-26 18:49 ` Oleg Nesterov
2011-03-28 13:30 ` Oleg Nesterov
2011-03-28 14:57 ` Peter Zijlstra
2011-03-28 15:00 ` Peter Zijlstra
2011-03-28 15:15 ` Oleg Nesterov
2011-03-28 16:27 ` Peter Zijlstra
2011-03-28 15:39 ` Oleg Nesterov
2011-03-28 15:49 ` Peter Zijlstra
2011-03-28 16:56 ` Oleg Nesterov
2011-03-29 8:32 ` Peter Zijlstra
2011-03-29 10:49 ` Peter Zijlstra
2011-03-29 16:28 ` Oleg Nesterov
2011-03-29 19:01 ` Peter Zijlstra
2011-03-30 13:09 ` Jiri Olsa
2011-03-30 14:51 ` Peter Zijlstra
2011-03-30 16:37 ` Oleg Nesterov
2011-03-30 18:30 ` Paul E. McKenney
2011-03-30 19:53 ` Oleg Nesterov
2011-03-30 21:26 ` Peter Zijlstra
2011-03-30 21:35 ` Oleg Nesterov
2011-03-31 10:32 ` Jiri Olsa
2011-03-31 12:41 ` [tip:perf/urgent] perf: Fix task context scheduling tip-bot for Peter Zijlstra
2011-03-31 13:28 ` [PATCH,RFC] perf: panic due to inclied cpu context task_ctx value Oleg Nesterov
2011-03-31 13:51 ` Peter Zijlstra
2011-03-31 14:10 ` Oleg Nesterov
2011-04-04 16:20 ` Oleg Nesterov
2011-03-30 15:32 ` Oleg Nesterov
2011-03-30 15:40 ` Peter Zijlstra
2011-03-30 15:52 ` Oleg Nesterov
2011-03-30 15:57 ` Peter Zijlstra
2011-03-30 16:11 ` Peter Zijlstra
2011-03-30 17:13 ` Oleg Nesterov
2011-03-26 17:09 ` Peter Zijlstra
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