From 3b3d190ec3683d568fd2ebaead5e1ec7f97b6e37 Mon Sep 17 00:00:00 2001 From: Paul Turner Date: Mon, 15 Nov 2010 15:47:08 -0800 Subject: sched: Implement demand based update_cfs_load() When the system is busy, dilation of rq->next_balance makes lb->update_shares() insufficiently frequent for threads which don't sleep (no dequeue/enqueue updates). Adjust for this by making demand based updates based on the accumulation of execution time sufficient to wrap our averaging window. Signed-off-by: Paul Turner Signed-off-by: Peter Zijlstra LKML-Reference: <20101115234938.291159744@google.com> Signed-off-by: Ingo Molnar --- kernel/sched_fair.c | 12 ++++++++++++ 1 file changed, 12 insertions(+) (limited to 'kernel/sched_fair.c') diff --git a/kernel/sched_fair.c b/kernel/sched_fair.c index 33f941d..e7e2f08 100644 --- a/kernel/sched_fair.c +++ b/kernel/sched_fair.c @@ -539,6 +539,9 @@ static u64 sched_vslice(struct cfs_rq *cfs_rq, struct sched_entity *se) return calc_delta_fair(sched_slice(cfs_rq, se), se); } +static void update_cfs_load(struct cfs_rq *cfs_rq); +static void update_cfs_shares(struct cfs_rq *cfs_rq, long weight_delta); + /* * Update the current task's runtime statistics. Skip current tasks that * are not in our scheduling class. @@ -558,6 +561,14 @@ __update_curr(struct cfs_rq *cfs_rq, struct sched_entity *curr, curr->vruntime += delta_exec_weighted; update_min_vruntime(cfs_rq); + +#ifdef CONFIG_FAIR_GROUP_SCHED + cfs_rq->load_unacc_exec_time += delta_exec; + if (cfs_rq->load_unacc_exec_time > sysctl_sched_shares_window) { + update_cfs_load(cfs_rq); + update_cfs_shares(cfs_rq, 0); + } +#endif } static void update_curr(struct cfs_rq *cfs_rq) @@ -713,6 +724,7 @@ static void update_cfs_load(struct cfs_rq *cfs_rq) } cfs_rq->load_stamp = now; + cfs_rq->load_unacc_exec_time = 0; cfs_rq->load_period += delta; if (load) { cfs_rq->load_last = now; -- cgit v1.1