tree 95320cc56a2f9af389ffa3bf17e64e1f8dc289d6
parent 5a7ff75a0c63222d138d944240146dc49a9624e1
author Martin Schwidefsky <schwidefsky@de.ibm.com> 1438611400 +0200
committer Martin Schwidefsky <schwidefsky@de.ibm.com> 1438691177 +0200

s390/vtime: limit MT scaling value updates

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>