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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


  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 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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