From: "David S. Miller" <davem@redhat.com>
To: ak@suse.de
Cc: ak@suse.de, torvalds@transmeta.com, marcelo@conectiva.com.br,
linux-kernel@vger.kernel.org
Subject: Re: test13-pre5
Date: Thu, 28 Dec 2000 15:14:56 -0800 [thread overview]
Message-ID: <200012282314.PAA01997@pizda.ninka.net> (raw)
In-Reply-To: <20001229001721.B25388@gruyere.muc.suse.de> (message from Andi Kleen on Fri, 29 Dec 2000 00:17:21 +0100)
In-Reply-To: <Pine.LNX.4.21.0012281637200.12364-100000@freak.distro.conectiva> <Pine.LNX.4.10.10012281243010.788-100000@penguin.transmeta.com> <20001228231722.A24875@gruyere.muc.suse.de> <200012282233.OAA01433@pizda.ninka.net> <20001228235836.A25388@gruyere.muc.suse.de> <200012282254.OAA01772@pizda.ninka.net> <20001229001721.B25388@gruyere.muc.suse.de>
Date: Fri, 29 Dec 2000 00:17:21 +0100
From: Andi Kleen <ak@suse.de>
On Thu, Dec 28, 2000 at 02:54:52PM -0800, David S. Miller wrote:
> To make things like "page - mem_map" et al. use shifts instead of
> expensive multiplies...
I thought that is what ->index is for ?
It is for the page cache identity Andi... you know, page_hash(mapping, index)...
And the add/sub/shift expansion of a multiply/divide by constant even
in its' most optimal form is often not trivial, it is something on the
order of 7 instructions with waitq debugging enabled last time I
checked.
Later,
David S. Miller
davem@redhat.com
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next prev parent reply other threads:[~2000-12-29 0:02 UTC|newest]
Thread overview: 62+ messages / expand[flat|nested] mbox.gz Atom feed top
2000-12-28 20:25 test13-pre5 Linus Torvalds
2000-12-28 18:39 ` test13-pre5 Marcelo Tosatti
2000-12-28 20:59 ` test13-pre5 Linus Torvalds
2000-12-28 19:22 ` test13-pre5 Marcelo Tosatti
2000-12-28 21:21 ` [wildly off-topic] test13-pre5 Rik van Riel
2000-12-28 19:31 ` Marcelo Tosatti
2000-12-28 21:39 ` test13-pre5 Daniel Phillips
2000-12-28 22:14 ` test13-pre5 Marcelo Tosatti
2000-12-29 1:10 ` test13-pre5 Linus Torvalds
2000-12-29 12:06 ` test13-pre5 Daniel Phillips
2000-12-28 22:17 ` test13-pre5 Andi Kleen
2000-12-28 23:15 ` test13-pre5 Linus Torvalds
2000-12-28 23:25 ` test13-pre5 Andi Kleen
2000-12-28 23:37 ` test13-pre5 Linus Torvalds
2000-12-28 23:43 ` test13-pre5 Andi Kleen
2000-12-29 0:49 ` test13-pre5 Stefan Traby
2000-12-29 1:23 ` test13-pre5 Linus Torvalds
2000-12-29 1:06 ` test13-pre5 Albert Cranford
2000-12-29 14:53 ` test13-pre5 Stefan Traby
2000-12-30 13:24 ` test13-pre5 Geert Uytterhoeven
2000-12-31 17:21 ` test13-pre5 Andi Kleen
2000-12-31 17:27 ` test13-pre5 Linus Torvalds
2000-12-31 17:36 ` test13-pre5 Andi Kleen
2000-12-31 18:19 ` test13-pre5 Andrea Arcangeli
2000-12-31 18:06 ` test13-pre5 Andi Kleen
2000-12-31 18:07 ` test13-pre5 Matti Aarnio
2000-12-31 19:15 ` test13-pre5 Linus Torvalds
2000-12-31 19:49 ` test13-pre5 Andi Kleen
2000-12-31 18:10 ` test13-pre5 Andrea Arcangeli
2001-01-01 19:58 ` test13-pre5 H. Peter Anvin
2000-12-28 22:33 ` test13-pre5 David S. Miller
2000-12-28 22:54 ` test13-pre5 David S. Miller
2000-12-28 23:14 ` David S. Miller [this message]
2000-12-28 23:39 ` test13-pre5 Andi Kleen
2000-12-28 23:17 ` test13-pre5 Andi Kleen
2000-12-28 23:25 ` test13-pre5 Rik van Riel
2000-12-28 23:36 ` test13-pre5 Linus Torvalds
2000-12-28 22:58 ` test13-pre5 Andi Kleen
2000-12-28 23:03 ` test13-pre5 Rik van Riel
2000-12-29 15:46 ` test13-pre5 Mark Hemment
2000-12-29 16:30 ` test13-pre5 Tim Wright
2000-12-29 17:54 ` test13-pre5 Mark Hemment
2000-12-29 21:23 ` test13-pre5 David S. Miller
2000-12-29 21:51 ` test13-pre5 Linus Torvalds
2000-12-29 16:49 ` [PATCH] filemap_fdatasync & related changes Marcelo Tosatti
2000-12-29 21:13 ` Linus Torvalds
2001-01-03 16:37 ` Chris Mason
2001-01-03 17:07 ` Daniel Phillips
2001-01-03 18:28 ` Linus Torvalds
2001-01-03 19:09 ` Chris Mason
2001-01-03 21:39 ` Chris Wedgwood
2001-01-04 18:46 ` Stephen C. Tweedie
2001-01-04 9:48 ` Christoph Rohland
2001-01-04 14:41 ` Marcelo Tosatti
2001-01-04 16:58 ` Rik van Riel
2001-01-04 17:38 ` Chris Mason
2001-01-04 18:00 ` Linus Torvalds
2001-01-04 22:52 ` Daniel Phillips
2001-01-04 15:30 ` Chris Mason
2001-01-04 17:01 ` Christoph Rohland
2000-12-28 21:27 ` test13-pre5 (via82cxxx_audio.c) Jonathan Hudson
2000-12-29 18:17 ` test13-pre5 Tom Rini
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