diff options
| author | Chen Yu <yu.c.chen@intel.com> | 2016-05-11 14:33:08 +0800 |
|---|---|---|
| committer | Rafael J. Wysocki <rafael.j.wysocki@intel.com> | 2016-05-11 22:56:34 +0200 |
| commit | 4578ee7e1defe534582fe3afdb747b86023207f0 (patch) | |
| tree | 2857ab0921181c08f60d3030ba8e04656f063e53 | |
| parent | c29af6f1a4e6f54e806fed1c40e7d338650b7791 (diff) | |
intel_pstate: Avoid unnecessary synchronize_sched() during initialization
Currently, in intel_pstate_clear_update_util_hook(), after
clearing the utilization update hook, we leverage
synchronize_sched() to deal with synchronization, which
is a little bit time-costly because synchronize_sched()
has to wait for all the CPUs to go through a grace period.
Actually, the synchronize_sched() is not necessary if the utilization
update hook has not been set for the given CPU yet, so make the driver
check if that's the case and avoid the synchronize_sched() call then.
Link: https://bugzilla.kernel.org/show_bug.cgi?id=116371
Tested-by: Tian Ye <yex.tian@intel.com>
Signed-off-by: Chen Yu <yu.c.chen@intel.com>
[ rjw : Rebase ]
Signed-off-by: Rafael J. Wysocki <rafael.j.wysocki@intel.com>