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Merge branch 'sched-urgent-for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/tip/tip

Browse Source 
Pull scheduler fixes from Ingo Molnar:
 "Two scheduler debugging fixes"

* 'sched-urgent-for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/tip/tip:
  sched/debug: Fix 'schedstats=enable' cmdline option
  sched/debug: Fix /proc/sched_debug regression
This commit is contained in:
Linus Torvalds 2016-06-10 11:24:39 -07:00
commit 60e383037b
3 changed files with 29 additions and 17 deletions
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28
kernel/sched/core.c
View File

@ -2253,9 +2253,11 @@ int sysctl_numa_balancing(struct ctl_table *table, int write,
#endif
#endif
DEFINE_STATIC_KEY_FALSE(sched_schedstats);
#ifdef CONFIG_SCHEDSTATS
DEFINE_STATIC_KEY_FALSE(sched_schedstats);
static bool __initdata __sched_schedstats = false;
static void set_schedstats(bool enabled)
{
if (enabled)
@ -2278,11 +2280,16 @@ static int __init setup_schedstats(char *str)
if (!str)
goto out;
/*
* This code is called before jump labels have been set up, so we can't
* change the static branch directly just yet. Instead set a temporary
* variable so init_schedstats() can do it later.
*/
if (!strcmp(str, "enable")) {
set_schedstats(true);
__sched_schedstats = true;
ret = 1;
} else if (!strcmp(str, "disable")) {
set_schedstats(false);
__sched_schedstats = false;
ret = 1;
}
out:
@ -2293,6 +2300,11 @@ out:
}
__setup("schedstats=", setup_schedstats);
static void __init init_schedstats(void)
{
set_schedstats(__sched_schedstats);
}
#ifdef CONFIG_PROC_SYSCTL
int sysctl_schedstats(struct ctl_table *table, int write,
void __user *buffer, size_t *lenp, loff_t *ppos)
@ -2313,8 +2325,10 @@ int sysctl_schedstats(struct ctl_table *table, int write,
set_schedstats(state);
return err;
}
#endif
#endif
#endif /* CONFIG_PROC_SYSCTL */
#else /* !CONFIG_SCHEDSTATS */
static inline void init_schedstats(void) {}
#endif /* CONFIG_SCHEDSTATS */
/*
* fork()/clone()-time setup:
@ -7487,6 +7501,8 @@ void __init sched_init(void)
#endif
init_sched_fair_class();
init_schedstats();
scheduler_running = 1;
}

15
kernel/sched/debug.c
View File

@ -427,19 +427,12 @@ print_task(struct seq_file *m, struct rq *rq, struct task_struct *p)
SPLIT_NS(p->se.vruntime),
(long long)(p->nvcsw + p->nivcsw),
p->prio);
#ifdef CONFIG_SCHEDSTATS
if (schedstat_enabled()) {
SEQ_printf(m, "%9Ld.%06ld %9Ld.%06ld %9Ld.%06ld",
SPLIT_NS(p->se.statistics.wait_sum),
SPLIT_NS(p->se.sum_exec_runtime),
SPLIT_NS(p->se.statistics.sum_sleep_runtime));
}
#else
SEQ_printf(m, "%9Ld.%06ld %9Ld.%06ld %9Ld.%06ld",
0LL, 0L,
SPLIT_NS(schedstat_val(p, se.statistics.wait_sum)),
SPLIT_NS(p->se.sum_exec_runtime),
0LL, 0L);
#endif
SPLIT_NS(schedstat_val(p, se.statistics.sum_sleep_runtime)));
#ifdef CONFIG_NUMA_BALANCING
SEQ_printf(m, " %d %d", task_node(p), task_numa_group_id(p));
#endif

3
kernel/sched/stats.h
View File

@ -33,6 +33,8 @@ rq_sched_info_dequeued(struct rq *rq, unsigned long long delta)
# define schedstat_inc(rq, field) do { if (schedstat_enabled()) { (rq)->field++; } } while (0)
# define schedstat_add(rq, field, amt) do { if (schedstat_enabled()) { (rq)->field += (amt); } } while (0)
# define schedstat_set(var, val) do { if (schedstat_enabled()) { var = (val); } } while (0)
# define schedstat_val(rq, field) ((schedstat_enabled()) ? (rq)->field : 0)
#else /* !CONFIG_SCHEDSTATS */
static inline void
rq_sched_info_arrive(struct rq *rq, unsigned long long delta)
@ -47,6 +49,7 @@ rq_sched_info_depart(struct rq *rq, unsigned long long delta)
# define schedstat_inc(rq, field) do { } while (0)
# define schedstat_add(rq, field, amt) do { } while (0)
# define schedstat_set(var, val) do { } while (0)
# define schedstat_val(rq, field) 0
#endif
#ifdef CONFIG_SCHED_INFO