From: Benjamin Herrenschmidt <benh@kernel.crashing.org>
To: Linus Torvalds <torvalds@osdl.org>
Cc: "David S. Miller" <davem@redhat.com>,
Linux Arch list <linux-arch@vger.kernel.org>
Subject: Re: clear_user_highpage()
Date: Thu, 12 Aug 2004 10:06:37 +1000 [thread overview]
Message-ID: <1092269196.2166.34.camel@gaston> (raw)
In-Reply-To: <Pine.LNX.4.58.0408111654440.1839@ppc970.osdl.org>
> You didn't read my message. If it doesn't crap on the caches when you do
> the stores, it _will_ crap on the bus both when you do the stores _and_
> when you actually read the page.
>
> In other words, you will have taken _more_ of a hit later on. It's just
> that it won't be a nice profile hit, it will be a nasty "everything runs
> slower later".
>
> Caches work best when you have good temporal locality. You are removing
> that locality, and thus you are making your caches _less_ efficient.
>
> That's a very _fundamental_ argument.
Ok, that may be why it was removed from ppc then, I should ask Paul.
Ben.
next prev parent reply other threads:[~2004-08-12 0:11 UTC|newest]
Thread overview: 41+ messages / expand[flat|nested] mbox.gz Atom feed top
2004-08-11 23:15 clear_user_highpage() David S. Miller
2004-08-11 23:31 ` clear_user_highpage() Benjamin Herrenschmidt
2004-08-11 23:55 ` clear_user_highpage() David S. Miller
2004-08-12 0:03 ` clear_user_highpage() Benjamin Herrenschmidt
2004-08-12 1:18 ` clear_user_highpage() William Lee Irwin III
2004-08-12 2:11 ` clear_user_highpage() Andi Kleen
2004-08-12 9:23 ` clear_user_highpage() Martin Schwidefsky
2004-08-11 23:46 ` clear_user_highpage() Linus Torvalds
2004-08-11 23:53 ` clear_user_highpage() David S. Miller
2004-08-12 0:00 ` clear_user_highpage() Linus Torvalds
2004-08-12 0:06 ` Benjamin Herrenschmidt [this message]
2004-08-12 0:24 ` clear_user_highpage() David S. Miller
2004-08-12 0:23 ` clear_user_highpage() David S. Miller
2004-08-12 1:46 ` clear_user_highpage() Linus Torvalds
2004-08-12 2:51 ` clear_user_highpage() David S. Miller
2004-08-16 1:58 ` clear_user_highpage() Paul Mackerras
2004-08-12 2:08 ` clear_user_highpage() Andi Kleen
2004-08-12 2:45 ` clear_user_highpage() David S. Miller
2004-08-12 9:09 ` clear_user_highpage() Andi Kleen
2004-08-12 19:50 ` clear_user_highpage() David S. Miller
2004-08-12 20:00 ` clear_user_highpage() Andi Kleen
2004-08-12 20:30 ` clear_user_highpage() David S. Miller
2004-08-12 21:34 ` clear_user_highpage() Matthew Wilcox
2004-08-13 8:16 ` clear_user_highpage() David Mosberger
2004-08-12 0:00 ` clear_user_highpage() Benjamin Herrenschmidt
2004-08-12 0:21 ` clear_user_highpage() Linus Torvalds
2004-08-12 0:46 ` clear_user_highpage() William Lee Irwin III
2004-08-12 1:01 ` clear_user_highpage() David S. Miller
2004-08-12 2:18 ` clear_user_highpage() Linus Torvalds
2004-08-12 2:43 ` clear_user_highpage() David S. Miller
2004-08-12 4:19 ` clear_user_highpage() Linus Torvalds
2004-08-12 4:46 ` clear_user_highpage() William Lee Irwin III
2004-08-15 6:22 ` clear_user_highpage() Andrew Morton
2004-08-15 6:38 ` clear_user_highpage() William Lee Irwin III
2004-08-12 2:57 ` clear_user_highpage() David S. Miller
2004-08-12 3:20 ` clear_user_highpage() William Lee Irwin III
2004-08-13 21:41 ` clear_user_highpage() David S. Miller
2004-08-16 13:00 ` clear_user_highpage() David Mosberger
2004-08-22 19:51 ` clear_user_highpage() Linus Torvalds
2005-09-17 19:01 ` clear_user_highpage() Andi Kleen
2005-09-17 19:16 ` clear_user_highpage() Andi Kleen
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