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author | Paul E. McKenney <paulmck@kernel.org> | 2021-05-27 12:01:21 -0700 |
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committer | Thomas Gleixner <tglx@linutronix.de> | 2021-06-22 16:53:16 +0200 |
commit | fa218f1cce6ba40069c8daab8821de7e6be1cdd0 (patch) | |
tree | f3dcc2b6a10d420b22b5f5eb0613380fd76177bb /scripts/kernel-doc | |
parent | 7560c02bdffb7c52d1457fa551b9e745d4b9e754 (diff) | |
download | linux-fa218f1cce6ba40069c8daab8821de7e6be1cdd0.tar.bz2 |
clocksource: Limit number of CPUs checked for clock synchronization
Currently, if skew is detected on a clock marked CLOCK_SOURCE_VERIFY_PERCPU,
that clock is checked on all CPUs. This is thorough, but might not be
what you want on a system with a few tens of CPUs, let alone a few hundred
of them.
Therefore, by default check only up to eight randomly chosen CPUs. Also
provide a new clocksource.verify_n_cpus kernel boot parameter. A value of
-1 says to check all of the CPUs, and a non-negative value says to randomly
select that number of CPUs, without concern about selecting the same CPU
multiple times. However, make use of a cpumask so that a given CPU will be
checked at most once.
Suggested-by: Thomas Gleixner <tglx@linutronix.de> # For verify_n_cpus=1.
Signed-off-by: Paul E. McKenney <paulmck@kernel.org>
Signed-off-by: Thomas Gleixner <tglx@linutronix.de>
Acked-by: Feng Tang <feng.tang@intel.com>
Link: https://lore.kernel.org/r/20210527190124.440372-3-paulmck@kernel.org
Diffstat (limited to 'scripts/kernel-doc')
0 files changed, 0 insertions, 0 deletions