s390/vtime: limit MT scaling value updates

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The MT scaling values are updated on each calll to do_account_vtime.
This function is called for each HZ interrupt and for each context
switch. Context switch can happen often, the STCCTM instruction
on this path is noticeable. Limit the updates to once per jiffy.

Signed-off-by: Martin Schwidefsky <schwidefsky@de.ibm.com>

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Martin Schwidefsky 2015-08-03 16:16:40 +02:00

parent 5a7ff75a0c

commit f341b8dff9

1 changed files with 11 additions and 1 deletions

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arch/s390/kernel/vtime.c

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