Re: [PATCH] WAIT_BIT_QUEUE
From: Andrew Morton
Date: Mon May 10 2004 - 06:32:13 EST
Oleg Nesterov <oleg@xxxxxxxxxx> wrote:
> a better (imho) alternative to filtered wakeups.
> see http://marc.theaimsgroup.com/?l=linux-kernel&m=108375670411475&w=2
> process waiting in wait_on_page_bit() will be woken only after
> the required bit is cleared.
> so there is no need to recheck the bit in do/while loop, because
> there is no false wakeups now.
yup. Please see the new patches in 2.6.6-mm1 - the waiter puts the bit
number into the waitqueue structure and the waker tests it before
delivering the wakeup.
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