From 6cecd084d0fd27bb1e498e2829fd45846d806856 Mon Sep 17 00:00:00 2001 From: Peter Zijlstra Date: Mon, 30 Nov 2009 13:00:37 +0100 Subject: [PATCH] sched: Discard some old bits WAKEUP_RUNNING was an experiment, not sure why that ever ended up being merged... Signed-off-by: Peter Zijlstra LKML-Reference: Signed-off-by: Ingo Molnar --- include/linux/sched.h | 2 -- kernel/sched.c | 17 +++++++---------- kernel/sched_debug.c | 1 - kernel/sched_fair.c | 3 --- kernel/sched_features.h | 5 ----- 5 files changed, 7 insertions(+), 21 deletions(-) diff --git a/include/linux/sched.h b/include/linux/sched.h index 31d9dec7867..4b1ebd3280c 100644 --- a/include/linux/sched.h +++ b/include/linux/sched.h @@ -1152,8 +1152,6 @@ struct sched_entity { u64 start_runtime; u64 avg_wakeup; - u64 avg_running; - #ifdef CONFIG_SCHEDSTATS u64 wait_start; u64 wait_max; diff --git a/kernel/sched.c b/kernel/sched.c index 33c90357313..0170735bdaf 100644 --- a/kernel/sched.c +++ b/kernel/sched.c @@ -2493,7 +2493,6 @@ static void __sched_fork(struct task_struct *p) p->se.avg_overlap = 0; p->se.start_runtime = 0; p->se.avg_wakeup = sysctl_sched_wakeup_granularity; - p->se.avg_running = 0; #ifdef CONFIG_SCHEDSTATS p->se.wait_start = 0; @@ -5379,13 +5378,14 @@ static inline void schedule_debug(struct task_struct *prev) #endif } -static void put_prev_task(struct rq *rq, struct task_struct *p) +static void put_prev_task(struct rq *rq, struct task_struct *prev) { - u64 runtime = p->se.sum_exec_runtime - p->se.prev_sum_exec_runtime; + if (prev->state == TASK_RUNNING) { + u64 runtime = prev->se.sum_exec_runtime; - update_avg(&p->se.avg_running, runtime); + runtime -= prev->se.prev_sum_exec_runtime; + runtime = min_t(u64, runtime, 2*sysctl_sched_migration_cost); - if (p->state == TASK_RUNNING) { /* * In order to avoid avg_overlap growing stale when we are * indeed overlapping and hence not getting put to sleep, grow @@ -5395,12 +5395,9 @@ static void put_prev_task(struct rq *rq, struct task_struct *p) * correlates to the amount of cache footprint a task can * build up. */ - runtime = min_t(u64, runtime, 2*sysctl_sched_migration_cost); - update_avg(&p->se.avg_overlap, runtime); - } else { - update_avg(&p->se.avg_running, 0); + update_avg(&prev->se.avg_overlap, runtime); } - p->sched_class->put_prev_task(rq, p); + prev->sched_class->put_prev_task(rq, prev); } /* diff --git a/kernel/sched_debug.c b/kernel/sched_debug.c index 6988cf08f70..5fda66615fe 100644 --- a/kernel/sched_debug.c +++ b/kernel/sched_debug.c @@ -399,7 +399,6 @@ void proc_sched_show_task(struct task_struct *p, struct seq_file *m) PN(se.sum_exec_runtime); PN(se.avg_overlap); PN(se.avg_wakeup); - PN(se.avg_running); nr_switches = p->nvcsw + p->nivcsw; diff --git a/kernel/sched_fair.c b/kernel/sched_fair.c index 76b5792c419..e9f5daee12c 100644 --- a/kernel/sched_fair.c +++ b/kernel/sched_fair.c @@ -1689,9 +1689,6 @@ static void check_preempt_wakeup(struct rq *rq, struct task_struct *p, int wake_ pse->avg_overlap < sysctl_sched_migration_cost) goto preempt; - if (sched_feat(WAKEUP_RUNNING) && pse->avg_running < se->avg_running) - goto preempt; - if (!sched_feat(WAKEUP_PREEMPT)) return; diff --git a/kernel/sched_features.h b/kernel/sched_features.h index 0d94083582c..d5059fd761d 100644 --- a/kernel/sched_features.h +++ b/kernel/sched_features.h @@ -53,11 +53,6 @@ SCHED_FEAT(WAKEUP_SYNC, 0) */ SCHED_FEAT(WAKEUP_OVERLAP, 0) -/* - * Wakeup preemption towards tasks that run short - */ -SCHED_FEAT(WAKEUP_RUNNING, 0) - /* * Use the SYNC wakeup hint, pipes and the likes use this to indicate * the remote end is likely to consume the data we just wrote, and