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| author | Ken Chen <kenchen@google.com> | 2008-12-16 23:41:22 -0800 |
|---|---|---|
| committer | Ingo Molnar <mingo@elte.hu> | 2008-12-18 13:54:01 +0100 |
| commit | 9c2c48020ec0dd6ecd27e5a1298f73b40d85a595 (patch) | |
| tree | 1a44f56e18012120aff0969094eebd572deb2ea3 | |
| parent | e9515c3c9feecd74174c2998add0db51e02abb8d (diff) | |
| download | kernel_samsung_aries-9c2c48020ec0dd6ecd27e5a1298f73b40d85a595.zip kernel_samsung_aries-9c2c48020ec0dd6ecd27e5a1298f73b40d85a595.tar.gz kernel_samsung_aries-9c2c48020ec0dd6ecd27e5a1298f73b40d85a595.tar.bz2 | |
schedstat: consolidate per-task cpu runtime stats
Impact: simplify code
When we turn on CONFIG_SCHEDSTATS, per-task cpu runtime is accumulated
twice. Once in task->se.sum_exec_runtime and once in sched_info.cpu_time.
These two stats are exactly the same.
Given that task->se.sum_exec_runtime is always accumulated by the core
scheduler, sched_info can reuse that data instead of duplicate the accounting.
Signed-off-by: Ken Chen <kenchen@google.com>
Acked-by: Peter Zijlstra <a.p.zijlstra@chello.nl>
Signed-off-by: Ingo Molnar <mingo@elte.hu>
| -rw-r--r-- | fs/proc/base.c | 2 | ||||
| -rw-r--r-- | include/linux/sched.h | 3 | ||||
| -rw-r--r-- | kernel/delayacct.c | 2 | ||||
| -rw-r--r-- | kernel/sched.c | 2 | ||||
| -rw-r--r-- | kernel/sched_stats.h | 5 |
5 files changed, 7 insertions, 7 deletions
diff --git a/fs/proc/base.c b/fs/proc/base.c index d467760..4d745ba 100644 --- a/fs/proc/base.c +++ b/fs/proc/base.c @@ -347,7 +347,7 @@ static int proc_pid_wchan(struct task_struct *task, char *buffer) static int proc_pid_schedstat(struct task_struct *task, char *buffer) { return sprintf(buffer, "%llu %llu %lu\n", - task->sched_info.cpu_time, + task->se.sum_exec_runtime, task->sched_info.run_delay, task->sched_info.pcount); } diff --git a/include/linux/sched.h b/include/linux/sched.h index 8cccd6d..2d1e840 100644 --- a/include/linux/sched.h +++ b/include/linux/sched.h @@ -670,8 +670,7 @@ struct reclaim_state; struct sched_info { /* cumulative counters */ unsigned long pcount; /* # of times run on this cpu */ - unsigned long long cpu_time, /* time spent on the cpu */ - run_delay; /* time spent waiting on a runqueue */ + unsigned long long run_delay; /* time spent waiting on a runqueue */ /* timestamps */ unsigned long long last_arrival,/* when we last ran on a cpu */ diff --git a/kernel/delayacct.c b/kernel/delayacct.c index b3179da..abb6e17 100644 --- a/kernel/delayacct.c +++ b/kernel/delayacct.c @@ -127,7 +127,7 @@ int __delayacct_add_tsk(struct taskstats *d, struct task_struct *tsk) */ t1 = tsk->sched_info.pcount; t2 = tsk->sched_info.run_delay; - t3 = tsk->sched_info.cpu_time; + t3 = tsk->se.sum_exec_runtime; d->cpu_count += t1; diff --git a/kernel/sched.c b/kernel/sched.c index f53e2b8..fd835fc 100644 --- a/kernel/sched.c +++ b/kernel/sched.c @@ -596,6 +596,8 @@ struct rq { #ifdef CONFIG_SCHEDSTATS /* latency stats */ struct sched_info rq_sched_info; + unsigned long long rq_cpu_time; + /* could above be rq->cfs_rq.exec_clock + rq->rt_rq.rt_runtime ? */ /* sys_sched_yield() stats */ unsigned int yld_exp_empty; diff --git a/kernel/sched_stats.h b/kernel/sched_stats.h index 7dbf72a..3b01098 100644 --- a/kernel/sched_stats.h +++ b/kernel/sched_stats.h @@ -31,7 +31,7 @@ static int show_schedstat(struct seq_file *seq, void *v) rq->yld_act_empty, rq->yld_exp_empty, rq->yld_count, rq->sched_switch, rq->sched_count, rq->sched_goidle, rq->ttwu_count, rq->ttwu_local, - rq->rq_sched_info.cpu_time, + rq->rq_cpu_time, rq->rq_sched_info.run_delay, rq->rq_sched_info.pcount); seq_printf(seq, "\n"); @@ -123,7 +123,7 @@ static inline void rq_sched_info_depart(struct rq *rq, unsigned long long delta) { if (rq) - rq->rq_sched_info.cpu_time += delta; + rq->rq_cpu_time += delta; } static inline void @@ -236,7 +236,6 @@ static inline void sched_info_depart(struct task_struct *t) unsigned long long delta = task_rq(t)->clock - t->sched_info.last_arrival; - t->sched_info.cpu_time += delta; rq_sched_info_depart(task_rq(t), delta); if (t->state == TASK_RUNNING) |