** Changed in: linux (Ubuntu)
Status: In Progress => Invalid
** Changed in: linux (Ubuntu Jammy)
Importance: Undecided => Medium
** Changed in: linux (Ubuntu Jammy)
Status: In Progress => Fix Committed
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https://bugs.launchpad.net/bugs/2052827
Title:
performance: mm/memcontrol.c: remove the redundant updating of
stats_flush_threshold
Status in linux package in Ubuntu:
Invalid
Status in linux source package in Jammy:
Fix Committed
Bug description:
This is a public version of https://bugs.launchpad.net/bugs/2034981
Backport upstream commit:
873f64b791a2 mm/memcontrol.c: remove the redundant updating of
stats_flush_threshold
to jammy.
[Impact]
Remove the redundant updating of stats_flush_threshold. If the global var
stats_flush_threshold has exceeded the trigger value for
__mem_cgroup_flush_stats, further increment is unnecessary.
This is targeting Sapphire Rapids platforms.
[Fix]
Upstream commit 873f64b791a2 fixes this issue. The fix involves not
updating the status after a certain threshold has been hit as it is
unnecessary.
[Test Plan]
I have tested the changes, and hit no regressions.
[Where problems could occur]
As the change has been upstream since 6.0-rc1, and is reducing a stats
update which isn't needed, the change for regressions should be
minimal.
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