From: Manfred Spraul <manfred@colorfullife.com>
To: Ingo Molnar <mingo@elte.hu>
Cc: linux-kernel@vger.kernel.org
Subject: Re: [patch] SMP races in the timer code, timer-fix-2.6.0-test7-A0
Date: Sat, 11 Oct 2003 17:01:26 +0200 [thread overview]
Message-ID: <3F881B46.6070301@colorfullife.com> (raw)
Ingo wrote:
>fixing this second race is hard - it involves a heavy race-check operation
>that has to lock all bases, and has to re-check the base->running_timer
>value, and timer_pending condition atomically.
>
>
What about moving the "timer running" information into the timer_list,
instead of keeping it in the base?
For example base=0 means neither running nor pending. base=1 means
running, but not pending, and pointers mean pending on the given base.
This would allow an atomic test without the brute force locking.
--
Manfred
next reply other threads:[~2003-10-11 15:01 UTC|newest]
Thread overview: 10+ messages / expand[flat|nested] mbox.gz Atom feed top
2003-10-11 15:01 Manfred Spraul [this message]
2003-10-11 15:49 ` [patch] SMP races in the timer code, timer-fix-2.6.0-test7-A0 Ingo Molnar
2003-10-11 16:08 ` Ingo Molnar
2003-10-11 16:17 ` Manfred Spraul
2003-10-13 10:12 ` Andrew Morton
2003-10-11 16:40 ` Ingo Molnar
2003-10-14 4:24 ` Linus Torvalds
2003-10-14 11:43 ` Ingo Molnar
-- strict thread matches above, loose matches on Subject: below --
2003-10-11 8:55 Ingo Molnar
2003-10-16 17:17 ` Andrea Arcangeli
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