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| author | Paul E. McKenney <paulmck@kernel.org> | 2020-03-17 19:39:26 +0100 |
|---|---|---|
| committer | Paul E. McKenney <paulmck@kernel.org> | 2020-04-27 20:03:52 +0200 |
| commit | b0afa0f056676ffe0a7213818f09d2460adbcc16 (patch) | |
| tree | 4886fdc32d67b8b4ce347d07f65b3bb5d95b5709 /init/init_task.c | |
| parent | rcu-tasks: Add a grace-period start time for throttling and debug (diff) | |
| download | linux-b0afa0f056676ffe0a7213818f09d2460adbcc16.tar.xz linux-b0afa0f056676ffe0a7213818f09d2460adbcc16.zip | |
rcu-tasks: Provide boot parameter to delay IPIs until late in grace period
This commit provides a rcupdate.rcu_task_ipi_delay kernel boot parameter
that specifies how old the RCU tasks trace grace period must be before
the grace-period kthread starts sending IPIs. This delay allows more
tasks to pass through rcu_tasks_qs() quiescent states, thus reducing
(or even eliminating) the number of IPIs that must be sent.
On a short rcutorture test setting this kernel boot parameter to HZ/2
resulted in zero IPIs for all 877 RCU-tasks trace grace periods that
elapsed during that test.
Signed-off-by: Paul E. McKenney <paulmck@kernel.org>
Diffstat (limited to 'init/init_task.c')
0 files changed, 0 insertions, 0 deletions