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authorIngo Molnar <mingo@elte.hu>2007-10-15 17:00:02 +0200
committerIngo Molnar <mingo@elte.hu>2007-10-15 17:00:02 +0200
commiteba1ed4b7e52720e3099325874811c38a5ec1562 (patch)
tree4ce145dd10b6cc248a2bc3463822dff23f9dd3c5
parenta4b29ba2f72673aaa60ba11ced74d579771dd578 (diff)
sched: debug: track maximum 'slice'
track the maximum amount of time a task has executed while the CPU load was at least 2x. (i.e. at least two nice-0 tasks were runnable) Signed-off-by: Ingo Molnar <mingo@elte.hu> Signed-off-by: Peter Zijlstra <a.p.zijlstra@chello.nl> Signed-off-by: Mike Galbraith <efault@gmx.de> Reviewed-by: Thomas Gleixner <tglx@linutronix.de>
-rw-r--r--include/linux/sched.h1
-rw-r--r--kernel/sched.c1
-rw-r--r--kernel/sched_debug.c2
-rw-r--r--kernel/sched_fair.c11
4 files changed, 15 insertions, 0 deletions
diff --git a/include/linux/sched.h b/include/linux/sched.h
index 833f7dc2b8d..9761b165d56 100644
--- a/include/linux/sched.h
+++ b/include/linux/sched.h
@@ -921,6 +921,7 @@ struct sched_entity {
u64 block_start;
u64 block_max;
u64 exec_max;
+ u64 slice_max;
unsigned long wait_runtime_overruns;
unsigned long wait_runtime_underruns;
diff --git a/kernel/sched.c b/kernel/sched.c
index e92b185e371..282d037c730 100644
--- a/kernel/sched.c
+++ b/kernel/sched.c
@@ -1603,6 +1603,7 @@ static void __sched_fork(struct task_struct *p)
p->se.sleep_max = 0;
p->se.block_max = 0;
p->se.exec_max = 0;
+ p->se.slice_max = 0;
p->se.wait_max = 0;
p->se.wait_runtime_overruns = 0;
p->se.wait_runtime_underruns = 0;
diff --git a/kernel/sched_debug.c b/kernel/sched_debug.c
index 94915f1fd9d..fd080f686f1 100644
--- a/kernel/sched_debug.c
+++ b/kernel/sched_debug.c
@@ -254,6 +254,7 @@ void proc_sched_show_task(struct task_struct *p, struct seq_file *m)
P(se.sleep_max);
P(se.block_max);
P(se.exec_max);
+ P(se.slice_max);
P(se.wait_max);
P(se.wait_runtime_overruns);
P(se.wait_runtime_underruns);
@@ -282,6 +283,7 @@ void proc_sched_set_task(struct task_struct *p)
p->se.sleep_max = 0;
p->se.block_max = 0;
p->se.exec_max = 0;
+ p->se.slice_max = 0;
p->se.wait_max = 0;
p->se.wait_runtime_overruns = 0;
p->se.wait_runtime_underruns = 0;
diff --git a/kernel/sched_fair.c b/kernel/sched_fair.c
index 0990b20fdcf..5c15d8ae92c 100644
--- a/kernel/sched_fair.c
+++ b/kernel/sched_fair.c
@@ -739,6 +739,17 @@ set_next_entity(struct cfs_rq *cfs_rq, struct sched_entity *se)
update_stats_wait_end(cfs_rq, se);
update_stats_curr_start(cfs_rq, se);
set_cfs_rq_curr(cfs_rq, se);
+#ifdef CONFIG_SCHEDSTATS
+ /*
+ * Track our maximum slice length, if the CPU's load is at
+ * least twice that of our own weight (i.e. dont track it
+ * when there are only lesser-weight tasks around):
+ */
+ if (rq_of(cfs_rq)->ls.load.weight >= 2*se->load.weight) {
+ se->slice_max = max(se->slice_max,
+ se->sum_exec_runtime - se->prev_sum_exec_runtime);
+ }
+#endif
se->prev_sum_exec_runtime = se->sum_exec_runtime;
}