diff options
| author | Rohit Gupta <rohgup@codeaurora.org> | 2014-03-14 18:56:14 -0700 |
|---|---|---|
| committer | David Keitel <dkeitel@codeaurora.org> | 2016-03-23 19:58:46 -0700 |
| commit | 48056d2399dfc6aead29a8a10aa9fd5e93ed00be (patch) | |
| tree | 8cab98b2a7daebe602fb37572fde3b84f66462ce /include/linux | |
| parent | 158eff54eaf77a47b86aff9fb96e7ab4819c7c06 (diff) | |
cpufreq: cpu-boost: Introduce scheduler assisted load based syncs
Previously, on getting a migration notification cpu-boost changed
the scaling min of the destination frequency to match that of the
source frequency or sync_threshold whichever was minimum.
If the scheduler migration notification is extended with task load
(cpu demand) information, the cpu boost driver can use this load to
compute a suitable frequency for the migrating task. The required
frequency for the task is calculated by taking the load percentage
of the max frequency and no sync is performed if the load is less
than a particular value (migration_load_threshold).This change is
beneficial for both perf and power as demand of a task is taken into
consideration while making cpufreq decisions and unnecessary syncs
for lightweight tasks are avoided.
The task load information provided by scheduler comes from a
window-based load collection mechanism which also normalizes the
load collected by the scheduler to the max possible frequency
across all CPUs.
Change-Id: Id2ba91cc4139c90602557f9b3801fb06b3c38992
Signed-off-by: Rohit Gupta <rohgup@codeaurora.org>
[rameezmustafa@codeaurora.org]: Port to msm-3.18]
Signed-off-by: Syed Rameez Mustafa <rameezmustafa@codeaurora.org>
[joonwoop@codeaurora.org: fixed conflict in __migrate_task().]
Signed-off-by: Joonwoo Park <joonwoop@codeaurora.org>
Diffstat (limited to 'include/linux')
| -rw-r--r-- | include/linux/sched.h | 5 |
1 files changed, 5 insertions, 0 deletions
diff --git a/include/linux/sched.h b/include/linux/sched.h index aa64a29d03be..0a664c44ee28 100644 --- a/include/linux/sched.h +++ b/include/linux/sched.h @@ -3158,6 +3158,11 @@ static inline void set_task_cpu(struct task_struct *p, unsigned int cpu) #endif /* CONFIG_SMP */ extern struct atomic_notifier_head migration_notifier_head; +struct migration_notify_data { + int src_cpu; + int dest_cpu; + int load; +}; extern long sched_setaffinity(pid_t pid, const struct cpumask *new_mask); extern long sched_getaffinity(pid_t pid, struct cpumask *mask); |