diff options
| author | Todd Kjos <tkjos@google.com> | 2016-03-11 16:44:16 -0800 |
|---|---|---|
| committer | Amit Pundir <amit.pundir@linaro.org> | 2016-09-14 14:59:32 +0530 |
| commit | b312c991e9055198e96571feaf73df26e647df56 (patch) | |
| tree | 9d9b0227cf9272781c53fb741452b8b961067c47 | |
| parent | d42fb8f959562bc34f7f2b17ca1e370f93a306a9 (diff) | |
sched/fair: add tunable to set initial task load
The choice of initial task load upon fork has a large influence
on CPU and OPP selection when scheduler-driven DVFS is in use.
Make this tuneable by adding a new sysctl "sched_initial_task_util".
If the sched governor is not used, the default remains at SCHED_LOAD_SCALE
Otherwise, the value from the sysctl is used. This defaults to 0.
Signed-off-by: "Todd Kjos <tkjos@google.com>"
| -rw-r--r-- | include/linux/sched/sysctl.h | 1 | ||||
| -rw-r--r-- | kernel/sched/fair.c | 5 | ||||
| -rw-r--r-- | kernel/sysctl.c | 7 |
3 files changed, 12 insertions, 1 deletions
diff --git a/include/linux/sched/sysctl.h b/include/linux/sched/sysctl.h index 4883dcf3e1a9..2834841c507e 100644 --- a/include/linux/sched/sysctl.h +++ b/include/linux/sched/sysctl.h @@ -41,6 +41,7 @@ extern unsigned int sysctl_sched_wakeup_granularity; extern unsigned int sysctl_sched_child_runs_first; extern unsigned int sysctl_sched_is_big_little; extern unsigned int sysctl_sched_sync_hint_enable; +extern unsigned int sysctl_sched_initial_task_util; extern unsigned int sysctl_sched_cstate_aware; enum sched_tunable_scaling { diff --git a/kernel/sched/fair.c b/kernel/sched/fair.c index e2b6174db07d..c60fd6685a05 100644 --- a/kernel/sched/fair.c +++ b/kernel/sched/fair.c @@ -53,6 +53,7 @@ unsigned int normalized_sysctl_sched_latency = 6000000ULL; unsigned int sysctl_sched_is_big_little = 0; unsigned int sysctl_sched_sync_hint_enable = 1; +unsigned int sysctl_sched_initial_task_util = 0; unsigned int sysctl_sched_cstate_aware = 1; /* @@ -687,7 +688,9 @@ void init_entity_runnable_average(struct sched_entity *se) sa->period_contrib = 1023; sa->load_avg = scale_load_down(se->load.weight); sa->load_sum = sa->load_avg * LOAD_AVG_MAX; - sa->util_avg = scale_load_down(SCHED_LOAD_SCALE); + sa->util_avg = sched_freq() ? + sysctl_sched_initial_task_util : + scale_load_down(SCHED_LOAD_SCALE); sa->util_sum = sa->util_avg * LOAD_AVG_MAX; /* when this task enqueue'ed, it will contribute to its cfs_rq's load_avg */ } diff --git a/kernel/sysctl.c b/kernel/sysctl.c index 831d674a5566..dd46f370b73a 100644 --- a/kernel/sysctl.c +++ b/kernel/sysctl.c @@ -319,6 +319,13 @@ static struct ctl_table kern_table[] = { .proc_handler = proc_dointvec, }, { + .procname = "sched_initial_task_util", + .data = &sysctl_sched_initial_task_util, + .maxlen = sizeof(unsigned int), + .mode = 0644, + .proc_handler = proc_dointvec, + }, + { .procname = "sched_cstate_aware", .data = &sysctl_sched_cstate_aware, .maxlen = sizeof(unsigned int), |