From: Ingo Molnar <mingo@elte.hu>
To: Andrea Arcangeli <andrea@suse.de>
Cc: Andrew Morton <akpm@osdl.org>, <linas@austin.ibm.com>,
<linux-kernel@vger.kernel.org>
Subject: Re: PATCH: Race in 2.6.0-test2 timer code
Date: Wed, 30 Jul 2003 12:34:39 +0200 (CEST) [thread overview]
Message-ID: <Pine.LNX.4.44.0307301232220.13891-100000@localhost.localdomain> (raw)
In-Reply-To: <20030730083726.GE23835@dualathlon.random>
On Wed, 30 Jul 2003, Andrea Arcangeli wrote:
> I never did any 2.6 patch, so it maybe a different thing what you've
> seen, not what I applied to 2.4. Infact even the 2.4 patch isn't from
> me.
the 2.4 timer-scalability patches do have a problem: due to TIMER_BH the
actual timer expiry can happen on a different CPU, which opens up a
del_timer()/add_timer() race in the itimer code. Your patch closes that
hole.
But on 2.6 the timer will run precisely on the CPU it was added, so i
think the race is not possible.
Ingo
next prev parent reply other threads:[~2003-07-30 10:35 UTC|newest]
Thread overview: 33+ messages / expand[flat|nested] mbox.gz Atom feed top
2003-07-29 15:41 PATCH: Race in 2.6.0-test2 timer code linas
2003-07-29 20:56 ` Andrew Morton
2003-07-30 5:57 ` Ingo Molnar
2003-07-30 6:36 ` Andrew Morton
2003-07-30 7:07 ` Ingo Molnar
2003-07-30 7:34 ` Andrea Arcangeli
2003-07-30 7:34 ` Ingo Molnar
2003-07-30 8:28 ` Andrea Arcangeli
2003-07-30 10:31 ` Ingo Molnar
2003-07-30 11:16 ` Andrea Arcangeli
2003-07-30 11:49 ` Ingo Molnar
2003-07-30 12:34 ` Andrea Arcangeli
2003-07-30 21:18 ` linas
2003-07-30 22:06 ` Andrea Arcangeli
2003-07-30 22:17 ` Andrea Arcangeli
2003-07-31 7:04 ` Ingo Molnar
2003-07-30 21:19 ` Andrea Arcangeli
2003-07-30 23:43 ` linas
2003-07-30 23:56 ` Andrea Arcangeli
2003-07-30 23:54 ` Andrew Morton
2003-07-31 0:16 ` Andrea Arcangeli
2003-07-31 17:23 ` linas
2003-08-01 6:27 ` Ingo Molnar
2003-07-30 7:40 ` Ingo Molnar
2003-07-30 8:37 ` Andrea Arcangeli
2003-07-30 10:34 ` Ingo Molnar [this message]
2003-07-30 10:51 ` Andrew Morton
2003-07-30 11:28 ` Andrea Arcangeli
2003-07-30 11:22 ` Andrea Arcangeli
2003-07-30 20:05 ` linas
2003-07-31 6:50 ` Ingo Molnar
2003-07-31 22:56 ` linas
2003-08-01 6:23 ` Ingo Molnar
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