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Date: Mon, 31 Dec 2001 11:28:31 -0800
From: Andrew Morton <akpm@zip.com.au>
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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()
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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.


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