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timers: Track total number of timers in list 

Currently, the tvec_base structure's ->active_timers field tracks only
the non-deferrable timers, which means that even if ->active_timers is
zero, there might well be deferrable timers in the list.  This commit
therefore adds an ->all_timers field to track all the timers, whether
deferrable or not.

Signed-off-by: Paul E. McKenney <paulmck@linux.vnet.ibm.com>
Reviewed-by: Josh Triplett <josh@joshtriplett.org>
Acked-by: Peter Zijlstra <peterz@infradead.org>
Reviewed-by: Oleg Nesterov <oleg@redhat.com>
Reviewed-by: Steven Rostedt <rostedt@goodmis.org>
Tested-by: Mike Galbraith <bitbucket@online.de>
This commit is contained in:
Paul E. McKenney 2014-01-14 20:20:43 -08:00
parent 849401b66d
commit fff421580f
1 changed files with 5 additions and 0 deletions
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5
kernel/timer.c
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@ -81,6 +81,7 @@ struct tvec_base {
unsigned long timer_jiffies;
unsigned long next_timer;
unsigned long active_timers;
unsigned long all_timers;
struct tvec_root tv1;
struct tvec tv2;
struct tvec tv3;
@ -392,6 +393,7 @@ static void internal_add_timer(struct tvec_base *base, struct timer_list *timer)
base->next_timer = timer->expires;
base->active_timers++;
}
base->all_timers++;
}
#ifdef CONFIG_TIMER_STATS
@ -671,6 +673,7 @@ detach_expired_timer(struct timer_list *timer, struct tvec_base *base)
detach_timer(timer, true);
if (!tbase_get_deferrable(timer->base))
base->active_timers--;
base->all_timers--;
}
static int detach_if_pending(struct timer_list *timer, struct tvec_base *base,
@ -685,6 +688,7 @@ static int detach_if_pending(struct timer_list *timer, struct tvec_base *base,
if (timer->expires == base->next_timer)
base->next_timer = base->timer_jiffies;
}
base->all_timers--;
return 1;
}
@ -1559,6 +1563,7 @@ static int init_timers_cpu(int cpu)
base->timer_jiffies = jiffies;
base->next_timer = base->timer_jiffies;
base->active_timers = 0;
base->all_timers = 0;
return 0;
}