s390/mm: optimize page table upgrade routine

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There is a maximum of two new tables allocated on page table
upgrade. Because we know that a loop the current implementation
is based on could be unrolled with some improvements:

  * upgrade from 3 to 5 levels happens in one go - without an
    unnecessary re-take of page_table_lock in-between;

  * page tables initialization moved out of the atomic code;

Signed-off-by: Alexander Gordeev <agordeev@linux.ibm.com>
Reviewed-by: Heiko Carstens <heiko.carstens@de.ibm.com>
Signed-off-by: Heiko Carstens <heiko.carstens@de.ibm.com>
Signed-off-by: Vasily Gorbik <gor@linux.ibm.com>

...

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Alexander Gordeev 2020-03-08 21:34:49 +01:00 • committed by Vasily Gorbik

parent bb533ec8ba

commit 31932757c6

1 changed files with 56 additions and 34 deletions

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arch/s390/mm/pgalloc.c

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