From: Andrew Morton <akpm@zip.com.au>
To: Manfred Spraul <manfred@colorfullife.com>
Cc: Dave Jones <davej@suse.de>, Linux Kernel <linux-kernel@vger.kernel.org>
Subject: Re: [patch] Prefetching file_read_actor()
Date: Mon, 31 Dec 2001 11:28:31 -0800 [thread overview]
Message-ID: <3C30BC5F.227349E8@zip.com.au> (raw)
In-Reply-To: <20011231033220.A1686@suse.de> <3C2FFB2F.D02095A2@zip.com.au> <3C3044D3.EBEF6657@colorfullife.com>
Manfred Spraul wrote:
>
> 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).
umm.. That will be the case practically 100% of the time in this
application, won't it?
Looks like you'll need to do a __get_user() against the page to
populate the tlb. We're going to need it in the copy_to_user()
anyway, so the cost is negligible.
-
next prev parent reply other threads:[~2001-12-31 19:32 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 [this message]
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
2001-12-31 13:00 ` Alan Cox
2001-12-31 12:50 ` Rik van Riel
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