[S390] zero page cache synonyms

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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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Martin Schwidefsky 2010-10-25 16:10:07 +02:00 • committed by Martin Schwidefsky

parent 229aebb873

commit 238ec4efee

2 changed files with 64 additions and 7 deletions

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22

arch/s390/include/asm/pgtable.h

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49

arch/s390/mm/init.c

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