Re: [PATCH] Page writeback broken after resume: wb_timer lost

From: Pavel Machek
Date: Sun May 21 2006 - 06:08:22 EST


> Well that's a crock, isn't it?
> Peter, does this fix it?
> From: Andrew Morton <akpm@xxxxxxxx>
> pdflush is carefully designed to ensure that all wakeups have some
> corresponding work to do - if a woken-up pdflush thread discovers that it
> hasn't been given any work to do then this is considered an error.
> That all broke when swsusp came along - because a timer-delivered wakeup to a
> frozen pdflush thread will just get lost. This causes the pdflush thread to
> get lost as well: the writeback timer is supposed to be re-armed by pdflush in
> process context, but pdflush doesn't execute the callout which does this.
> Fix that up by ignoring the return value from try_to_freeze(): jsut proceed,
> see if we have any work pending and only go back to sleep if that is not the
> case.

Looks okay to me.

(who wonders what are the other places where we have similar
(cesky, pictures)
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