Messages in this thread | | | Date | Tue, 12 Nov 2002 12:49:50 -0200 (BRST) | From | Rik van Riel <> | Subject | Re: [PATCH] flush_cache_page while pte valid |
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On Mon, 11 Nov 2002, David S. Miller wrote: > From: Hugh Dickins <hugh@veritas.com> > Date: Tue, 12 Nov 2002 06:53:04 +0000 (GMT) > > Thanks for shedding light on that; but I'm still wondering if there > might be data loss if userspace modifies the page in the tiny window > between correctly positioned flush_cache_page and pte invalidation? > > The flush merely writes back the data, a copy-back operation, fully L2 > cache coherent. All cpus will see correct data if an intermittant > store occurs.
The CPUs will, but the harddisk might not.
We really need to get this right in the swapout path.
regards,
Rik -- Bravely reimplemented by the knights who say "NIH". http://www.surriel.com/ http://distro.conectiva.com/ Current spamtrap: <a href=mailto:"october@surriel.com">october@surriel.com</a>
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