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block: add queue flag for SSD/non-rotational devices

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We don't want to idle in AS/CFQ if the device doesn't have a seek
penalty. So add a QUEUE_FLAG_NONROT to indicate a non-rotational
device, low level drivers should set this flag upon discovery of
an SSD or similar device type.

Signed-off-by: Jens Axboe <[email protected]>
This commit is contained in:
Jens Axboe 2008-09-24 13:03:33 +02:00
commit a68bbddba4
3 changed files with 14 additions and 0 deletions
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6
block/as-iosched.c
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@ -745,6 +745,12 @@ static int as_can_break_anticipation(struct as_data *ad, struct request *rq)
*/
static int as_can_anticipate(struct as_data *ad, struct request *rq)
{
/*
* SSD device without seek penalty, disable idling
*/
if (blk_queue_nonrot(ad->q))
return 0;
if (!ad->io_context)
/*
* Last request submitted was a write

6
block/cfq-iosched.c
View file

@ -878,6 +878,12 @@ static void cfq_arm_slice_timer(struct cfq_data *cfqd)
struct cfq_io_context *cic;
unsigned long sl;
/*
* SSD device without seek penalty, disable idling
*/
if (blk_queue_nonrot(cfqd->queue))
return;
WARN_ON(!RB_EMPTY_ROOT(&cfqq->sort_list));
WARN_ON(cfq_cfqq_slice_new(cfqq));