From: Andrew Morton <akpm@zip.com.au>
To: "David S. Miller" <davem@redhat.com>
Cc: mingo@elte.hu, velco@fadata.bg, linux-kernel@vger.kernel.org,
torvalds@transmeta.com
Subject: Re: [PATCH] Scalable page cache
Date: Mon, 26 Nov 2001 11:45:36 -0800 [thread overview]
Message-ID: <3C029BE0.2BEA2264@zip.com.au> (raw)
In-Reply-To: <Pine.LNX.4.33.0111262201420.18923-100000@localhost.localdomain>, <87vgfxqwd3.fsf@fadata.bg> <Pine.LNX.4.33.0111262201420.18923-100000@localhost.localdomain> <20011126.111854.102567147.davem@redhat.com>
"David S. Miller" wrote:
>
> From: Ingo Molnar <mingo@elte.hu>
> Date: Mon, 26 Nov 2001 22:09:02 +0100 (CET)
>
> something like this:
>
> - #define SetPageReferenced(page) set_bit(PG_referenced, &(page)->flags)
> + #define SetPageReferenced(page) \
> + if (!test_bit(PG_referenced), &(page)->flags) \
> + set_bit(PG_referenced, &(page)->flags)
>
> On some platforms all the {test_,}{clear,change,set}_bit() ops give
> you this cache behavior. How hard would it be to make ix86 act
> similarly?
It would be nice to have a full complement of non-atomic
bitops. At present we have __set_bit, but no __clear_bit, etc.
So we often do buslocked RMW's in places where it's not needed.
-
next prev parent reply other threads:[~2001-11-26 19:48 UTC|newest]
Thread overview: 34+ messages / expand[flat|nested] mbox.gz Atom feed top
2001-11-26 12:31 [PATCH] Scalable page cache Momchil Velikov
2001-11-26 17:22 ` Ingo Molnar
2001-11-26 17:23 ` Momchil Velikov
2001-11-26 18:16 ` Benjamin LaHaise
2001-11-26 18:42 ` Rik van Riel
2001-11-26 20:29 ` Ingo Molnar
2001-11-26 18:33 ` David S. Miller
2001-11-26 19:29 ` Andrew Morton
2001-11-26 19:35 ` David S. Miller
2001-11-26 18:34 ` Benjamin LaHaise
2001-11-26 20:40 ` Ingo Molnar
2001-11-26 19:19 ` Benjamin LaHaise
2001-11-26 21:00 ` Ingo Molnar
2001-11-26 20:43 ` Daniel Phillips
2001-11-26 19:49 ` Ingo Molnar
2001-11-26 18:08 ` Christoph Hellwig
2001-11-26 20:13 ` Ingo Molnar
2001-11-26 21:09 ` Ingo Molnar
2001-11-26 19:18 ` David S. Miller
2001-11-26 19:45 ` Andrew Morton [this message]
2001-11-26 19:57 ` David S. Miller
2001-11-26 20:03 ` Andrew Morton
2001-11-26 20:37 ` Linus Torvalds
2001-11-26 21:02 ` Andrew Morton
2001-11-26 22:23 ` Linus Torvalds
2001-11-26 22:49 ` Jeff Garzik
2001-11-26 23:06 ` Linus Torvalds
2001-11-26 21:10 ` Ingo Molnar
2001-11-26 17:29 ` Linus Torvalds
2001-11-26 20:03 ` Ingo Molnar
2001-11-26 18:02 ` David S. Miller
2001-11-26 18:11 ` Rik van Riel
2001-11-27 8:07 ` benchmark results: " Anton Blanchard
2001-11-26 18:52 ` [PATCH] " Daniel Phillips
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