Commit 04dc6e71 authored by Jeff Moyer's avatar Jeff Moyer Committed by Jens Axboe

cfq-iosched: use the default seek distance when there aren't enough seek samples

If the cfq io context doesn't have enough samples yet to provide a mean
seek distance, then use the default threshold we have for seeky IO instead
of defaulting to 0.
Signed-off-by: default avatarJeff Moyer <jmoyer@redhat.com>
Signed-off-by: default avatarJens Axboe <jens.axboe@oracle.com>
parent 4d00aa47
......@@ -947,14 +947,18 @@ static inline sector_t cfq_dist_from_last(struct cfq_data *cfqd,
return cfqd->last_position - rq->sector;
}
#define CIC_SEEK_THR 8 * 1024
#define CIC_SEEKY(cic) ((cic)->seek_mean > CIC_SEEK_THR)
static inline int cfq_rq_close(struct cfq_data *cfqd, struct request *rq)
{
struct cfq_io_context *cic = cfqd->active_cic;
sector_t sdist = cic->seek_mean;
if (!sample_valid(cic->seek_samples))
return 0;
sdist = CIC_SEEK_THR;
return cfq_dist_from_last(cfqd, rq) <= cic->seek_mean;
return cfq_dist_from_last(cfqd, rq) <= sdist;
}
static struct cfq_queue *cfqq_close(struct cfq_data *cfqd,
......@@ -1039,9 +1043,6 @@ static struct cfq_queue *cfq_close_cooperator(struct cfq_data *cfqd,
return cfqq;
}
#define CIC_SEEKY(cic) ((cic)->seek_mean > (8 * 1024))
static void cfq_arm_slice_timer(struct cfq_data *cfqd)
{
struct cfq_queue *cfqq = cfqd->active_queue;
......
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