diff options
| author | Joonwoo Park <joonwoop@codeaurora.org> | 2015-08-31 17:21:35 -0700 |
|---|---|---|
| committer | David Keitel <dkeitel@codeaurora.org> | 2016-03-23 20:02:43 -0700 |
| commit | 07eb3f803b419bdebad45d846113dc069307be90 (patch) | |
| tree | 845a39607dde5f403295b161cbd321ee4e4f3122 /include/linux | |
| parent | fd38bb103d3e0be4796dd9fa19c2d0c90c06cf6a (diff) | |
sched: select task's prev_cpu as the best CPU when it was chosen recently
Select given task's prev_cpu when the task slept for short period to
reduce latency of task placement and migrations. A new tunable
/proc/sys/kernel/sched_select_prev_cpu_us introduced to determine whether
tasks are eligible to go through fast path.
CRs-fixed: 947467
Change-Id: Ia507665b91f4e9f0e6ee1448d8df8994ead9739a
[joonwoop@codeaurora.org: fixed conflict in include/linux/sched.h,
include/linux/sched/sysctl.h, kernel/sched/core.c and kernel/sysctl.c]
Signed-off-by: Joonwoo Park <joonwoop@codeaurora.org>
Diffstat (limited to 'include/linux')
| -rw-r--r-- | include/linux/sched.h | 1 | ||||
| -rw-r--r-- | include/linux/sched/sysctl.h | 1 |
2 files changed, 2 insertions, 0 deletions
diff --git a/include/linux/sched.h b/include/linux/sched.h index d5275982df22..2125f214f287 100644 --- a/include/linux/sched.h +++ b/include/linux/sched.h @@ -1458,6 +1458,7 @@ struct task_struct { */ u32 init_load_pct; u64 last_wake_ts; + u64 last_switch_out_ts; #endif #ifdef CONFIG_CGROUP_SCHED struct task_group *sched_task_group; diff --git a/include/linux/sched/sysctl.h b/include/linux/sched/sysctl.h index 0663cf3c7410..bfea9efef2e9 100644 --- a/include/linux/sched/sysctl.h +++ b/include/linux/sched/sysctl.h @@ -70,6 +70,7 @@ extern unsigned int sysctl_early_detection_duration; extern unsigned int sysctl_sched_lowspill_freq; extern unsigned int sysctl_sched_pack_freq; extern unsigned int sysctl_sched_boost; +extern unsigned int sysctl_sched_select_prev_cpu_us; #if defined(CONFIG_SCHED_FREQ_INPUT) extern unsigned int sysctl_sched_new_task_windows; #endif |