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dm cache policy mq: remove queue_shift_down() 

queue_shift_down() didn't adjust the hit_counts to the new levels, so it
just had the effect of scrambling levels.

Signed-off-by: Joe Thornber <ejt@redhat.com>
Signed-off-by: Mike Snitzer <snitzer@redhat.com>
This commit is contained in:
Joe Thornber 2015-02-20 13:01:22 +00:00 committed by Mike Snitzer
parent 75da39bf25
commit c74ffc5c63
1 changed files with 0 additions and 16 deletions
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16
drivers/md/dm-cache-policy-mq.c
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@ -159,18 +159,6 @@ static void queue_remove(struct queue *q, struct list_head *elt)
list_del(elt);
}
/*
* Shifts all regions down one level. This has no effect on the order of
* the queue.
*/
static void queue_shift_down(struct queue *q)
{
unsigned level;
for (level = 1; level < NR_QUEUE_LEVELS; level++)
list_splice_init(q->qs + level, q->qs + level - 1);
}
/*
* Gives us the oldest entry of the lowest popoulated level. If the first
* level is emptied then we shift down one level.
@ -193,10 +181,6 @@ static struct list_head *queue_pop(struct queue *q)
if (r) {
q->nr_elts--;
list_del(r);
/* have we just emptied the bottom level? */
if (list_empty(q->qs))
queue_shift_down(q);
}
return r;