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Date: Thu, 11 Nov 2010 21:29:22 +0100
From: Oleg Nesterov <oleg@...hat.com>
To: Linus Torvalds <torvalds@...ux-foundation.org>
Cc: Mike Galbraith <efault@....de>,
Peter Zijlstra <a.p.zijlstra@...llo.nl>,
Mathieu Desnoyers <mathieu.desnoyers@...icios.com>,
Ingo Molnar <mingo@...e.hu>,
LKML <linux-kernel@...r.kernel.org>,
Markus Trippelsdorf <markus@...ppelsdorf.de>
Subject: Re: [RFC/RFT PATCH v3] sched: automated per tty task groups
On 11/11, Linus Torvalds wrote:
>
> Well, it cuts both ways. Maybe your approach is simpler and avoids
> overhead at scheduling time. And "tsk->signal" may not be reliable due
> to races with exit etc, so it may well be that going through the
> signal struct could end up being a source of nasty races. I didn't
> look whether the scheduler already derefenced ->signal for some other
> reason, for example.
Just in case, starting from 2.6.35 tsk->signal is reliable.
Oleg.
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