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| author | Paul E. McKenney | 2011-11-23 02:46:19 +0100 |
|---|---|---|
| committer | Paul E. McKenney | 2011-12-11 19:32:01 +0100 |
| commit | 84ad00cb61f1cb21f0b63bc6f7dc254399eb3830 (patch) | |
| tree | 7f275af0caaead54a5e8847afa308f5e2b33997a /include/trace/events/asoc.h | |
| parent | rcu: Go dyntick-idle more quickly if CPU has serviced current grace period (diff) | |
| download | kernel-qcow2-linux-84ad00cb61f1cb21f0b63bc6f7dc254399eb3830.tar.gz kernel-qcow2-linux-84ad00cb61f1cb21f0b63bc6f7dc254399eb3830.tar.xz kernel-qcow2-linux-84ad00cb61f1cb21f0b63bc6f7dc254399eb3830.zip | |
rcu: Avoid needlessly IPIing CPUs at GP end
If a CPU enters dyntick-idle mode with callbacks pending, it will need
an IPI at the end of the grace period. However, if it exits dyntick-idle
mode before the grace period ends, it will be needlessly IPIed at the
end of the grace period.
Therefore, this commit clears the per-CPU rcu_awake_at_gp_end flag
when a CPU determines that it does not need it. This in turn requires
disabling interrupts across much of rcu_prepare_for_idle() in order to
avoid having nested interrupts clearing this state out from under us.
Signed-off-by: Paul E. McKenney <paul.mckenney@linaro.org>
Signed-off-by: Paul E. McKenney <paulmck@linux.vnet.ibm.com>
Diffstat (limited to 'include/trace/events/asoc.h')
0 files changed, 0 insertions, 0 deletions