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(parent: 26a35f3) | patch
s390/mm: optimize copy_page
authorHeiko Carstens <heiko.carstens@de.ibm.com>
Tue, 19 Nov 2013 13:25:17 +0000 (14:25 +0100)
committerMartin Schwidefsky <schwidefsky@de.ibm.com>
Wed, 20 Nov 2013 08:04:55 +0000 (09:04 +0100)
commitdba6bb60043ed73abca8990f237db63a8cea6c50
treecdd10045cafcd15567c00faaa66bad74164aa507tree | snapshot
parent26a35f373fbe6f21e8ad5ca4de1c01021e38fe2fcommit | diff
s390/mm: optimize copy_page

Always use the mvcl instruction to copy a page instead of mvpg or a
couple of mvc instructions.
Copying a huge page is 25% faster this way. Also bypass caches when
copying pages since only parts of a page will be used afterwards.
Especially when copying a huge page this would kick everything out
of the L1 and L2 data caches on a zEC12 machine.

Signed-off-by: Heiko Carstens <heiko.carstens@de.ibm.com>
arch/s390/include/asm/page.h diff | blob | history
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