diff options
| author | Srivatsa Vaddagiri <vatsa@codeaurora.org> | 2014-11-04 14:24:19 +0530 |
|---|---|---|
| committer | David Keitel <dkeitel@codeaurora.org> | 2016-03-23 20:00:58 -0700 |
| commit | 33af11b6f4238f34860e305cf7610021ea8036b4 (patch) | |
| tree | 0a6200a2b28d5ee6475662b7fdcf95ecc4f4bb84 /kernel/sched | |
| parent | bb63ece414d917d843ab3fbb44c230fad035d416 (diff) | |
sched: Add API to set task's initial task load
Add a per-task attribute, init_load_pct, that is used to initialize
newly created children's initial task load. This helps important
applications launch their child tasks on cpus with highest capacity.
Change-Id: Ie9665fd2aeb15203f95fd7f211c50bebbaa18727
Signed-off-by: Srivatsa Vaddagiri <vatsa@codeaurora.org>
[joonwoop@codeaurora.org: fixed conflict int init_new_task_load.
se.avg.runnable_avg_sum has deprecated.]
Signed-off-by: Joonwoo Park <joonwoop@codeaurora.org>
Diffstat (limited to 'kernel/sched')
| -rw-r--r-- | kernel/sched/fair.c | 32 |
1 files changed, 29 insertions, 3 deletions
diff --git a/kernel/sched/fair.c b/kernel/sched/fair.c index e078a63adc51..833225a9fe57 100644 --- a/kernel/sched/fair.c +++ b/kernel/sched/fair.c @@ -2700,6 +2700,21 @@ void set_hmp_defaults(void) (u64)sched_ravg_window, 100); } +u32 sched_get_init_task_load(struct task_struct *p) +{ + return p->init_load_pct; +} + +int sched_set_init_task_load(struct task_struct *p, int init_load_pct) +{ + if (init_load_pct < 0 || init_load_pct > 100) + return -EINVAL; + + p->init_load_pct = init_load_pct; + + return 0; +} + /* * 'load' is in reference to "best cpu" at its best frequency. * Scale that in reference to a given cpu, accounting for how bad it is @@ -3605,13 +3620,24 @@ static inline int capacity(struct rq *rq) void init_new_task_load(struct task_struct *p) { int i; + u32 init_load_windows = sched_init_task_load_windows; + u32 init_load_pelt = sched_init_task_load_pelt; + u32 init_load_pct = current->init_load_pct; + /* Note: child's init_load_pct itself would be 0 */ memset(&p->ravg, 0, sizeof(struct ravg)); + if (init_load_pct) { + init_load_pelt = div64_u64((u64)init_load_pct * + (u64)LOAD_AVG_MAX, 100); + init_load_windows = div64_u64((u64)init_load_pct * + (u64)sched_ravg_window, 100); + } + + p->ravg.demand = init_load_windows; for (i = 0; i < RAVG_HIST_SIZE_MAX; ++i) - p->ravg.sum_history[i] = sched_init_task_load_windows; - p->se.avg.runnable_avg_sum_scaled = sched_init_task_load_pelt; - p->ravg.demand = sched_init_task_load_windows; + p->ravg.sum_history[i] = init_load_windows; + p->se.avg.runnable_avg_sum_scaled = init_load_pelt; } #else /* CONFIG_SCHED_HMP */ |