From: Andi Kleen <ak@muc.de>
To: Linus Torvalds <torvalds@transmeta.com>
Cc: Andrew Morton <andrewm@uow.edu.au>, linux-mm@kvack.org
Subject: Re: 3rd version of R/W mmap_sem patch available
Date: Tue, 20 Mar 2001 17:33:49 +0100 [thread overview]
Message-ID: <20010320173349.A4839@fred.local> (raw)
In-Reply-To: <Pine.LNX.4.31.0103200801480.1503-100000@penguin.transmeta.com>; from torvalds@transmeta.com on Tue, Mar 20, 2001 at 05:08:36PM +0100
On Tue, Mar 20, 2001 at 05:08:36PM +0100, Linus Torvalds wrote:
> > General comment: an expensive part of a pagefault
> > is zeroing the new page. It'd be nice if we could
> > drop the page_table_lock while doing the clear_user_page()
> > and, if possible, copy_user_page() functions. Very nice.
>
> I don't think it's worth it. We should have basically zero contention on
> this lock now, and adding complexity to try to release it sounds like a
> bad idea when the only way to make contention on it is (a) kswapd (only
> when paging stuff out) and (b) multiple threads (only when taking
> concurrent page faults).
Isn't (b) a rather common case in multi threaded applications ?
-Andi
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next prev parent reply other threads:[~2001-03-20 16:33 UTC|newest]
Thread overview: 26+ messages / expand[flat|nested] mbox.gz Atom feed top
[not found] <Pine.LNX.4.33.0103191802330.2076-100000@mikeg.weiden.de>
2001-03-20 1:56 ` Rik van Riel
2001-03-19 22:46 ` Linus Torvalds
2001-03-20 2:46 ` Linus Torvalds
2001-03-20 4:15 ` Marcelo Tosatti
2001-03-20 6:07 ` Linus Torvalds
2001-03-20 4:29 ` Marcelo Tosatti
2001-03-20 6:36 ` Linus Torvalds
2001-03-20 7:03 ` Linus Torvalds
2001-03-20 8:19 ` Eric W. Biederman
2001-03-20 15:11 ` Andrew Morton
2001-03-20 15:15 ` Jeff Garzik
2001-03-20 15:16 ` Jeff Garzik
2001-03-20 15:31 ` Andrew Morton
2001-03-21 1:59 ` Eric W. Biederman
2001-03-20 16:08 ` Linus Torvalds
2001-03-20 16:33 ` Andi Kleen [this message]
2001-03-20 17:13 ` Linus Torvalds
2001-03-20 19:33 ` Rik van Riel
2001-03-20 22:51 ` Andrew Morton
2001-03-22 10:24 ` Andrew Morton
2001-03-25 14:53 ` [patch] pae-2.4.3-A4 Ingo Molnar
2001-03-25 16:33 ` Russell King
2001-03-25 18:07 ` Linus Torvalds
2001-03-25 18:51 ` Ingo Molnar
[not found] <3AB6C7C2.D1A49FEF@uow.edu.au>
[not found] ` <Pine.LNX.4.31.0103191932240.7210-100000@penguin.transmeta.com>
2001-03-20 12:38 ` 3rd version of R/W mmap_sem patch available Stephen C. Tweedie
2001-03-20 14:02 ` H. Peter Anvin
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