From: Ingo Molnar <mingo@elte.hu>
To: Linus Torvalds <torvalds@transmeta.com>
Cc: Andrew Morton <akpm@digeo.com>,
Rusty Russell <rusty@rustcorp.com.au>,
<linux-kernel@vger.kernel.org>
Subject: Re: [patch] 'sticky pages' support in the VM, futex-2.5.38-C5
Date: Fri, 27 Sep 2002 13:11:47 +0200 (CEST) [thread overview]
Message-ID: <Pine.LNX.4.44.0209271307510.8893-100000@localhost.localdomain> (raw)
In-Reply-To: <Pine.LNX.4.33.0209261533230.1345-100000@penguin.transmeta.com>
On Thu, 26 Sep 2002, Linus Torvalds wrote:
> and then the "callback" function just updates the page information in
> the futex block directly - as if it was looked up anew.
yes. And it would also have to rehash the futex queue (which is hashed
along (page,offset), because a FUTEX_WAKE has to find the proper queue -
but it's still very cheap.
this also means that FUTEX_WAIT does not have to make the futex page
writable - just making it present and hashing it along the physical page.
Ie. more robust and less intrusive futexes.
Ingo
next prev parent reply other threads:[~2002-09-27 10:57 UTC|newest]
Thread overview: 14+ messages / expand[flat|nested] mbox.gz Atom feed top
2002-09-26 11:30 [patch] 'sticky pages' support in the VM, futex-2.5.38-C5 Ingo Molnar
2002-09-26 15:01 ` Linus Torvalds
2002-09-26 22:09 ` Andrew Morton
2002-09-26 22:32 ` Linus Torvalds
2002-09-27 7:53 ` Ingo Molnar
2002-09-26 22:45 ` Linus Torvalds
2002-09-26 22:56 ` Linus Torvalds
2002-09-27 11:11 ` Ingo Molnar [this message]
2002-10-04 22:47 ` Jamie Lokier
2002-10-04 23:20 ` Linus Torvalds
[not found] <200209261501.g8QF1pc02251@penguin.transmeta.com>
2002-09-26 15:27 ` Ingo Molnar
2002-09-26 16:48 ` Alan Cox
2002-09-27 8:05 Martin Wirth
2002-09-27 9:27 ` Ingo Molnar
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