[PATCH] x86-64: Add __copy_from_user_nocache

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This does user copies in fs write() into the page cache with write combining.
This pushes the destination out of the CPU's cache, but allows higher bandwidth
in some case.

The theory is that the page cache data is usually not touched by the
CPU again and it's better to not pollute the cache with it. Also it is a little
faster.

Signed-off-by: Andi Kleen <ak@suse.de>

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Andi Kleen 2007-02-13 13:26:19 +01:00 • committed by Andi Kleen

parent ee55c0be30

commit 0812a579c9

4 changed files with 233 additions and 1 deletions

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1

arch/x86_64/kernel/x8664_ksyms.c

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2

arch/x86_64/lib/Makefile

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217

arch/x86_64/lib/copy_user_nocache.S

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14

include/asm-x86_64/uaccess.h

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