From 94dfb5e75ef59068a8cf68fa6e18f25ebdcd20b9 Mon Sep 17 00:00:00 2001 From: Peter Zijlstra Date: Mon, 15 Oct 2007 17:00:05 +0200 Subject: [PATCH] sched: add tree based averages add support for tree based vruntime averages. Signed-off-by: Peter Zijlstra Signed-off-by: Ingo Molnar Signed-off-by: Mike Galbraith Reviewed-by: Thomas Gleixner --- kernel/sched.c | 6 +++++- kernel/sched_fair.c | 20 +++++++++++++------- 2 files changed, 18 insertions(+), 8 deletions(-) diff --git a/kernel/sched.c b/kernel/sched.c index bf85b4b281..198b07a6d0 100644 --- a/kernel/sched.c +++ b/kernel/sched.c @@ -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) diff --git a/kernel/sched_fair.c b/kernel/sched_fair.c index c8c6b05613..86e5e8c5d1 100644 --- a/kernel/sched_fair.c +++ b/kernel/sched_fair.c @@ -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 (last) { - min_runtime += last->vruntime; - min_runtime >>= 1; - if (initial && sched_feat(START_DEBIT)) - min_runtime += sysctl_sched_latency/2; - } + + 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; + } + } 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; -- 2.39.5