diff options
| author |   Vincent Guittot <vincent.guittot@linaro.org> | 2020-01-15 11:20:20 +0100 |
|---|---|---|
| committer |   Peter Zijlstra <peterz@infradead.org> | 2020-01-17 10:19:22 +0100 |
| commit | a4f9a0e51bbf89cb461b1985a1a570e6b87da3b5 (patch) | |
| tree | 9a4f99835b7065a85a2832921bde7ef3f2233503 /include/linux/sched | |
| parent | sched/psi: create /proc/pressure and /proc/pressure/{io|memory|cpu} only when psi enabled (diff) | |
| download | wireguard-linux-a4f9a0e51bbf89cb461b1985a1a570e6b87da3b5.tar.xz wireguard-linux-a4f9a0e51bbf89cb461b1985a1a570e6b87da3b5.zip | |
sched/fair: Remove redundant call to cpufreq_update_util()
With commit
bef69dd87828 ("sched/cpufreq: Move the cfs_rq_util_change() call to cpufreq_update_util()")
update_load_avg() has become the central point for calling cpufreq
(not including the update of blocked load). This change helps to
simplify further the number of calls to cpufreq_update_util() and to
remove last redundant ones. With update_load_avg(), we are now sure
that cpufreq_update_util() will be called after every task attachment
to a cfs_rq and especially after propagating this event down to the
util_avg of the root cfs_rq, which is the level that is used by
cpufreq governors like schedutil to set the frequency of a CPU.
The SCHED_CPUFREQ_MIGRATION flag forces an early call to cpufreq when
the migration happens in a cgroup whereas util_avg of root cfs_rq is
not yet updated and this call is duplicated with the one that happens
immediately after when the migration event reaches the root cfs_rq.
The dedicated flag SCHED_CPUFREQ_MIGRATION is now useless and can be
removed. The interface of attach_entity_load_avg() can also be
simplified accordingly.
Signed-off-by: Vincent Guittot <vincent.guittot@linaro.org>
Signed-off-by: Peter Zijlstra (Intel) <peterz@infradead.org>
Reviewed-by: Rafael J. Wysocki <rafael.j.wysocki@intel.com>
Link: https://lkml.kernel.org/r/1579083620-24943-1-git-send-email-vincent.guittot@linaro.org
Diffstat (limited to 'include/linux/sched')
| -rw-r--r-- | include/linux/sched/cpufreq.h | 1 |
1 files changed, 0 insertions, 1 deletions
diff --git a/include/linux/sched/cpufreq.h b/include/linux/sched/cpufreq.h index cc6bcc1e96bc..3ed5aa18593f 100644 --- a/include/linux/sched/cpufreq.h +++ b/include/linux/sched/cpufreq.h @@ -9,7 +9,6 @@ */ #define SCHED_CPUFREQ_IOWAIT (1U << 0) -#define SCHED_CPUFREQ_MIGRATION (1U << 1) #ifdef CONFIG_CPU_FREQ struct cpufreq_policy; |