From: Ingo Molnar <mingo@elte.hu>
To: Jack Steiner <steiner@sgi.com>
Cc: linux-kernel@vger.kernel.org
Subject: Re: [PATCH] - Fix potential race condition in wake_up_forked_process()
Date: Thu, 9 Sep 2004 21:56:42 +0200 [thread overview]
Message-ID: <20040909195642.GA3435@elte.hu> (raw)
In-Reply-To: <20040909194558.GA28653@sgi.com>
* Jack Steiner <steiner@sgi.com> wrote:
> There appears to be a tiny (microscopic) timing hole in
> wake_up_forked_process(). It is possible that a load_balancing
> application could change cpus_allowed on a task as it is being forked.
> Unlikely, but it can happen, especially if preemption is enabled.
there has been alot of work in this area and sched.c in -BK is much
different from 2.6.8.1's sched.c. In particular there's no
wake_up_forked_process() but wake_up_new_task().
more importantly, the whole bootstrapping of a new task has been
reworked and the set_cpus_allowed() race should not exist in -BK
anymore. Could you double-check to make sure?
Ingo
prev parent reply other threads:[~2004-09-09 20:01 UTC|newest]
Thread overview: 2+ messages / expand[flat|nested] mbox.gz Atom feed top
2004-09-09 19:45 [PATCH] - Fix potential race condition in wake_up_forked_process() Jack Steiner
2004-09-09 19:56 ` Ingo Molnar [this message]
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