tree d9efb4be22cc550c7559c29627a48d66413c645a
parent 229aebb873e29726b91e076161649cf45154b0bf
author Martin Schwidefsky <schwidefsky@de.ibm.com> 1288015807 +0200
committer Martin Schwidefsky <sky@mschwide.boeblingen.de.ibm.com> 1288015814 +0200

[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>