From: Andrew Morton <akpm@osdl.org>
To: Oleg Nesterov <oleg@tv-sign.ru>
Cc: linux-kernel@vger.kernel.org, torvalds@osdl.org
Subject: Re: [PATCH] WAIT_BIT_QUEUE
Date: Mon, 10 May 2004 04:30:10 -0700 [thread overview]
Message-ID: <20040510043010.0c9dd1e8.akpm@osdl.org> (raw)
In-Reply-To: <409F668A.CEFD60F6@tv-sign.ru>
Oleg Nesterov <oleg@tv-sign.ru> 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.
next prev parent reply other threads:[~2004-05-10 11:30 UTC|newest]
Thread overview: 4+ messages / expand[flat|nested] mbox.gz Atom feed top
2004-05-10 11:24 Oleg Nesterov
2004-05-10 11:30 ` Andrew Morton [this message]
2004-05-10 12:31 ` Oleg Nesterov
2004-05-10 14:55 ` Linus Torvalds
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