From: Dave Jones <davej@suse.de>
To: Manfred Spraul <manfred@colorfullife.com>
Cc: Andrew Morton <akpm@zip.com.au>,
Linux Kernel <linux-kernel@vger.kernel.org>
Subject: Re: [patch] Prefetching file_read_actor()
Date: Mon, 31 Dec 2001 20:31:22 +0000 [thread overview]
Message-ID: <20011231203122.A17288@suse.de> (raw)
In-Reply-To: <20011231033220.A1686@suse.de> <3C2FFB2F.D02095A2@zip.com.au> <3C3044D3.EBEF6657@colorfullife.com>
In-Reply-To: <3C3044D3.EBEF6657@colorfullife.com>
On Mon, Dec 31, 2001 at 11:58:27AM +0100, Manfred Spraul wrote:
> > What happens if a prefetch spills over the end of the page and
> > faults?
> Doesn't hurt, prefetch instruction never cause page faults.
> BUT: Prefetch doesn't preload the TLB. If the TLB entry for the kmap is
> not in the TLB, all prefetch instructions are treated as nops.(on pIII).
Wasn't this the reason for the voodoo workaround we have in
the mmx version of fast_copy_page() ?
Dave.
--
Dave Jones. http://www.codemonkey.org.uk
SuSE Labs.
next prev parent reply other threads:[~2001-12-31 20:29 UTC|newest]
Thread overview: 14+ messages / expand[flat|nested] mbox.gz Atom feed top
2001-12-31 3:32 [patch] Prefetching file_read_actor() Dave Jones
2001-12-31 5:44 ` Andrew Morton
2001-12-31 10:58 ` Manfred Spraul
2001-12-31 19:28 ` Andrew Morton
2001-12-31 19:47 ` Dave Jones
2001-12-31 20:40 ` Ryan Cumming
2002-01-01 10:29 ` Alan Cox
2002-01-01 12:45 ` Dave Jones
2002-01-01 15:26 ` Alan Cox
2002-01-01 10:30 ` Alan Cox
2002-01-01 11:08 ` Anton Blanchard
2001-12-31 20:31 ` Dave Jones [this message]
2001-12-31 13:00 ` Alan Cox
2001-12-31 12:50 ` Rik van Riel
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