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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 /include/linux/rcutree.h | |
| parent | 58dedf0a4782ce42b4d31f1f62e5ad80a1b73d72 (diff) | |
| download | linux-a1ff03cd6fb9c501fff63a4a2bface9adcfa81cd.tar.gz | |
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 'include/linux/rcutree.h')
0 files changed, 0 insertions, 0 deletions