Re: [patch] del_timer_sync scalability patch

From: Christoph Lameter
Date: Fri Mar 11 2005 - 16:15:06 EST

On Fri, 11 Mar 2005, Oleg Nesterov wrote:

> I think it is not enough to exchange these 2 lines in
> __run_timers, we also need barriers.

Maybe its best to drop last_running_timer as Ingo suggested.

Replace the magic with a flag that can be set to stop scheduling a timer

Then del_timer_sync may

1. Set the flag not to reschedule
2. delete the timer
3. wait till the timer function is complete
4. (eventually verify that the timer is really gone)
5. reset the no reschedule flag

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