timers/nohz: Update NOHZ load in remote tick

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The way loadavg is tracked during nohz only pays attention to the load
upon entering nohz.  This can be particularly noticeable if full nohz is
entered while non-idle, and then the cpu goes idle and stays that way for
a long time.

Use the remote tick to ensure that full nohz cpus report their deltas
within a reasonable time.

[ swood: Added changelog and removed recheck of stopped tick. ]

Signed-off-by: Peter Zijlstra (Intel) <peterz@infradead.org>
Signed-off-by: Scott Wood <swood@redhat.com>
Signed-off-by: Peter Zijlstra (Intel) <peterz@infradead.org>
Signed-off-by: Ingo Molnar <mingo@kernel.org>
Link: https://lkml.kernel.org/r/1578736419-14628-3-git-send-email-swood@redhat.com

...

This commit is contained in:

Peter Zijlstra (Intel) 2020-01-11 04:53:39 -05:00 • committed by Ingo Molnar

parent 488603b815

commit ebc0f83c78

3 changed files with 28 additions and 11 deletions

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2

include/linux/sched/nohz.h

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4

kernel/sched/core.c

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33

kernel/sched/loadavg.c

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