提交 94dfb5e7 编写于 作者: P Peter Zijlstra 提交者: Ingo Molnar

sched: add tree based averages

add support for tree based vruntime averages.
Signed-off-by: NPeter Zijlstra <a.p.zijlstra@chello.nl>
Signed-off-by: NIngo Molnar <mingo@elte.hu>
Signed-off-by: NMike Galbraith <efault@gmx.de>
Reviewed-by: NThomas Gleixner <tglx@linutronix.de>
上级 28a1f6fa
......@@ -399,6 +399,8 @@ enum {
SCHED_FEAT_SLEEPER_AVG = 4,
SCHED_FEAT_SLEEPER_LOAD_AVG = 8,
SCHED_FEAT_START_DEBIT = 16,
SCHED_FEAT_USE_TREE_AVG = 32,
SCHED_FEAT_APPROX_AVG = 64,
};
const_debug unsigned int sysctl_sched_features =
......@@ -406,7 +408,9 @@ const_debug unsigned int sysctl_sched_features =
SCHED_FEAT_NEW_FAIR_SLEEPERS *1 |
SCHED_FEAT_SLEEPER_AVG *0 |
SCHED_FEAT_SLEEPER_LOAD_AVG *1 |
SCHED_FEAT_START_DEBIT *1;
SCHED_FEAT_START_DEBIT *1 |
SCHED_FEAT_USE_TREE_AVG *0 |
SCHED_FEAT_APPROX_AVG *0;
#define sched_feat(x) (sysctl_sched_features & SCHED_FEAT_##x)
......
......@@ -547,16 +547,22 @@ static void enqueue_sleeper(struct cfs_rq *cfs_rq, struct sched_entity *se)
static void
place_entity(struct cfs_rq *cfs_rq, struct sched_entity *se, int initial)
{
struct sched_entity *last = __pick_last_entity(cfs_rq);
u64 min_runtime, latency;
min_runtime = cfs_rq->min_vruntime;
if (sched_feat(USE_TREE_AVG)) {
struct sched_entity *last = __pick_last_entity(cfs_rq);
if (last) {
min_runtime = __pick_next_entity(cfs_rq)->vruntime;
min_runtime += last->vruntime;
min_runtime >>= 1;
if (initial && sched_feat(START_DEBIT))
min_runtime += sysctl_sched_latency/2;
}
} else if (sched_feat(APPROX_AVG))
min_runtime += sysctl_sched_latency/2;
if (initial && sched_feat(START_DEBIT))
min_runtime += sched_slice(cfs_rq, se);
if (!initial && sched_feat(NEW_FAIR_SLEEPERS)) {
latency = sysctl_sched_latency;
......
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