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| author |   Frederic Weisbecker <frederic@kernel.org> | 2022-02-02 01:01:07 +0100 |
|---|---|---|
| committer | Frederic Weisbecker <frederic@kernel.org> | 2022-03-07 23:01:19 +0100 |
| commit | a1ff03cd6fb9c501fff63a4a2bface9adcfa81cd (patch) | |
| tree | 5a5e4af9948395d52664857409bb6d4c4811efe8 /tools/perf/scripts/python/export-to-postgresql.py | |
| parent | Merge branch 'clocksource.2022.02.01b' of git://git.kernel.org/pub/scm/linux/kernel/git/paulmck/linux-rcu into timers/core (diff) | |
| download | wireguard-linux-a1ff03cd6fb9c501fff63a4a2bface9adcfa81cd.tar.xz wireguard-linux-a1ff03cd6fb9c501fff63a4a2bface9adcfa81cd.zip | |
tick: Detect and fix jiffies update stall
On some rare cases, the timekeeper CPU may be delaying its jiffies
update duty for a while. Known causes include:
* The timekeeper is waiting on stop_machine in a MULTI_STOP_DISABLE_IRQ
or MULTI_STOP_RUN state. Disabled interrupts prevent from timekeeping
updates while waiting for the target CPU to complete its
stop_machine() callback.
* The timekeeper vcpu has VMEXIT'ed for a long while due to some overload
on the host.
Detect and fix these situations with emergency timekeeping catchups.
Original-patch-by: Paul E. McKenney <paulmck@kernel.org>
Signed-off-by: Frederic Weisbecker <frederic@kernel.org>
Cc: Thomas Gleixner <tglx@linutronix.de>
Diffstat (limited to '')
0 files changed, 0 insertions, 0 deletions