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| author |   Martin Schwidefsky <schwidefsky@de.ibm.com> | 2010-10-25 16:10:07 +0200 |
|---|---|---|
| committer |   Martin Schwidefsky <sky@mschwide.boeblingen.de.ibm.com> | 2010-10-25 16:10:14 +0200 |
| commit | 238ec4efeee4461d5cff2ed3e5a15a3ab850959b (patch) | |
| tree | d9efb4be22cc550c7559c29627a48d66413c645a /drivers/s390/block/dasd_3990_erp.c | |
| parent | Merge branch 'for-next' of git://git.kernel.org/pub/scm/linux/kernel/git/jikos/trivial (diff) | |
| download | linux-dev-238ec4efeee4461d5cff2ed3e5a15a3ab850959b.tar.xz linux-dev-238ec4efeee4461d5cff2ed3e5a15a3ab850959b.zip | |
[S390] zero page cache synonyms
If the zero page is mapped to virtual user space addresses that differ
only in bit 2^12 or 2^13 we get L1 cache synonyms which can affect
performance. Follow the mips model and use multiple zero pages to avoid
the synonyms.
Signed-off-by: Martin Schwidefsky <schwidefsky@de.ibm.com>
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