linux-kernel - Re: utime/stime decreasing on thread exit

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Message-ID: <20091109192355.GA13724@redhat.com>
Date:	Mon, 9 Nov 2009 20:23:55 +0100
From:	Oleg Nesterov <oleg@...hat.com>
To:	Peter Zijlstra <peterz@...radead.org>
Cc:	Hidetoshi Seto <seto.hidetoshi@...fujitsu.com>,
	Spencer Candland <spencer@...ehost.com>,
	linux-kernel@...r.kernel.org, Ingo Molnar <mingo@...e.hu>,
	Stanislaw Gruszka <sgruszka@...hat.com>
Subject: Re: utime/stime decreasing on thread exit

On 11/09, Peter Zijlstra wrote:
>
> On Mon, 2009-11-09 at 18:20 +0100, Oleg Nesterov wrote:
>
> > Stanislaw has already sent the patch, but I don't know what happened
> > with this patch:
> >
> > 	[PATCH 1/2] posix-cpu-timers: avoid do_sys_times() races with __exit_signal()
> > 	http://marc.info/?l=linux-kernel&m=124505545131145
>
> That patch has the siglock in the function calling
> thread_group_cputime(), the 22 code had it near the loop proper, which
> to me seems a more sensible thing, since there could be more callers,
> no?

Well, we can't take ->siglock in thread_group_cputime(), sometimes it
is called under ->siglock. do_task_stat(), get_cpu_itimer() at least.

IIRC, Stanislaw verified other callers have no problems with this helper.

Oleg.

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