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List: linux-arch
Subject: [PATCH 0/4] Fix COW D-cache aliasing on fork
From: Ralf Baechle <ralf () linux-mips ! org>
Date: 2006-12-12 17:14:53
Message-ID: 11659436971966-git-send-email-ralf () linux-mips ! org
[Download RAW message or body]
This is a respin of the patch series I posted a while ago updated for
today's kernel:
o patch 1/4 allows an architecture to override the generic
copy_user_highpage with an architecture specific implementation. For
details about the aliasing issue please see the log message of that
patch.
o patch 2/4 passes a vma argument to copy_user_highpage. This allows
an architecture to optimize its cache handling by looking at the
vma's VM_EXEC flag. On architecture that do not make use of this gcc
will be able to optimize the argument passing away, so no overhead.
o patch 3/4 uses the facilities of the first two patches to solve the
alias issue for MIPS
o patch 4/4 is not a cache alias fix but allows optimizing away the
cache flush operation in dup_mm(). On a MIPS 34K this accelerates
fork by 12.5%.
Since this patch is logically separate from 1-3 it can be applied
independantly.
Ralf
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