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clocksource: Make clocksource insert entry more efficient 

In clocksource_enqueue(), it is unnecessary to continue looping
the list, if we find there is an entry that the value of rating
is smaller than the new one. It is safe to be out the loop,
because all of entry are inserted in descending order.

Cc: Prarit Bhargava <prarit@redhat.com>
Cc: Richard Cochran <richardcochran@gmail.com>
Cc: Thomas Gleixner <tglx@linutronix.de>
Cc: Ingo Molnar <mingo@kernel.org>
Signed-off-by: Minfei Huang <mnghuan@gmail.com>
Signed-off-by: John Stultz <john.stultz@linaro.org>
This commit is contained in:
Minfei Huang 2016-04-25 17:20:28 +08:00 committed by John Stultz
parent af8c34ce6a
commit 0fb71d340d
1 changed files with 5 additions and 3 deletions
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8
kernel/time/clocksource.c
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@ -669,10 +669,12 @@ static void clocksource_enqueue(struct clocksource *cs)
struct list_head *entry = &clocksource_list;
struct clocksource *tmp;
list_for_each_entry(tmp, &clocksource_list, list)
list_for_each_entry(tmp, &clocksource_list, list) {
/* Keep track of the place, where to insert */
if (tmp->rating >= cs->rating)
entry = &tmp->list;
if (tmp->rating < cs->rating)
break;
entry = &tmp->list;
}
list_add(&cs->list, entry);
}