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From: Jamie Lokier <lk@tantalophile.demon.co.uk>
To: Ingo Molnar <mingo@elte.hu>
Cc: Linus Torvalds <torvalds@transmeta.com>,
	Andrew Morton <akpm@zip.com.au>,
	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, 4 Oct 2002 23:47:06 +0100	[thread overview]
Message-ID: <20021004234706.A6683@kushida.apsleyroad.org> (raw)
In-Reply-To: <Pine.LNX.4.44.0209261311070.11487-100000@localhost.localdomain>; from mingo@elte.hu on Thu, Sep 26, 2002 at 01:30:55PM +0200

Ingo Molnar wrote:
> futexes were not really designed with COW in mind - they were designed
> to be used in non-COW shared memory. This is a very bad limitation

I thought that futex-based locks were only reliable with PROT_SEM
memory, for architectures that define PROT_SEM (e.g. PPC) -- because of
the need for locking primitives to work in a cache coherent manner.

Is this not so?

-- Jamie

  parent reply	other threads:[~2002-10-04 22:42 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
2002-10-04 22:47 ` Jamie Lokier [this message]
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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