From: Ralf Baechle <ralf@linux-mips.org>
To: Hartvig Ekner <hartvige@mips.com>
Cc: Dominic Sweetman <dom@algor.co.uk>,
Carsten Langgaard <carstenl@mips.com>,
linux-mips@linux-mips.org
Subject: Re: Promblem with PREF (prefetching) in memcpy
Date: Fri, 4 Oct 2002 14:38:45 +0200 [thread overview]
Message-ID: <20021004143845.A15883@linux-mips.org> (raw)
In-Reply-To: <200210041233.g94CXrQ29071@copfs01.mips.com>; from hartvige@mips.com on Fri, Oct 04, 2002 at 02:33:53PM +0200
On Fri, Oct 04, 2002 at 02:33:53PM +0200, Hartvig Ekner wrote:
> this problem occurs in kernel space (kseg0), not user space. In user space
> there is no problem due to the TLB "protection" of PREFs going outside the
> process working set, but that doesn't help in kernel mode.
Assume a userspace device driver having some hardware mapped immediately
following a ordinary memory mapping. In that case it would be possible
for prefetch to run from the one into the next mapping - boom.
Ralf
next prev parent reply other threads:[~2002-10-04 12:39 UTC|newest]
Thread overview: 36+ messages / expand[flat|nested] mbox.gz Atom feed top
2002-10-04 7:50 Promblem with PREF (prefetching) in memcpy Carsten Langgaard
2002-10-04 11:53 ` Dominic Sweetman
2002-10-04 12:11 ` Carsten Langgaard
2002-10-04 12:35 ` Dr. David Alan Gilbert
2002-10-04 12:36 ` Alan Cox
2002-10-04 12:35 ` Carsten Langgaard
2002-10-04 13:09 ` Alan Cox
2002-10-04 13:07 ` Hartvig Ekner
2002-10-04 13:07 ` Hartvig Ekner
2002-10-04 13:00 ` Kevin D. Kissell
2002-10-04 13:00 ` Kevin D. Kissell
2002-10-04 13:15 ` Alan Cox
2002-10-04 13:15 ` Kevin D. Kissell
2002-10-04 13:15 ` Kevin D. Kissell
2002-10-04 13:44 ` Alan Cox
2002-10-04 14:17 ` Kevin D. Kissell
2002-10-04 14:17 ` Kevin D. Kissell
2002-10-04 14:54 ` Alan Cox
2002-10-04 13:01 ` Maciej W. Rozycki
2002-10-04 13:17 ` Ralf Baechle
2002-10-04 13:32 ` Maciej W. Rozycki
2002-10-04 13:29 ` Dominic Sweetman
2002-10-04 13:46 ` Maciej W. Rozycki
2002-10-04 12:33 ` Hartvig Ekner
2002-10-04 12:33 ` Hartvig Ekner
2002-10-04 12:38 ` Ralf Baechle [this message]
2002-10-04 12:36 ` Kevin D. Kissell
2002-10-04 12:36 ` Kevin D. Kissell
2002-10-04 14:24 ` Dominic Sweetman
2002-10-04 14:24 ` Dominic Sweetman
2002-10-04 23:43 ` Ralf Baechle
2002-10-05 15:12 ` Hartvig Ekner
2002-10-05 15:12 ` Hartvig Ekner
2002-10-05 15:56 ` Alan Cox
2002-10-04 12:37 ` Kevin D. Kissell
2002-10-04 12:37 ` Kevin D. Kissell
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