tick/sched: Account tickless idle cputime only when tick is stopped

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There is no real point in switching to dyntick-idle cputime accounting mode
if the tick is not actually stopped. This just adds overhead, notably
fetching the GTOD, on each idle exit and each idle IRQ entry for no reason
during short idle trips.

Signed-off-by: Frederic Weisbecker <frederic@kernel.org>
Signed-off-by: Thomas Gleixner <tglx@kernel.org>
Tested-by: Shrikanth Hegde <sshegde@linux.ibm.com>
Link: https://patch.msgid.link/20260508131647.43868-12-frederic@kernel.org

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Frederic Weisbecker 2026-05-08 15:16:43 +02:00 • committed by Thomas Gleixner

parent 29807c524d

commit 6a1f6a9dd0

1 changed files with 26 additions and 24 deletions

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kernel/time/tick-sched.c

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