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authorJens Axboe <axboe@kernel.dk>2017-08-09 01:53:33 +0200
committerJens Axboe <axboe@kernel.dk>2017-08-09 21:09:33 +0200
commitb8d62b3a9c25d64d8de4a272314dac0c957982f2 (patch)
tree8da4ed2c4ad00ed7469ebe90bdc741830ffa0426 /block
parentblk-mq: provide internal in-flight variant (diff)
downloadlinux-b8d62b3a9c25d64d8de4a272314dac0c957982f2.tar.xz
linux-b8d62b3a9c25d64d8de4a272314dac0c957982f2.zip
blk-mq: enable checking two part inflight counts at the same time
Modify blk_mq_in_flight() to count both a partition and root at the same time. Then we only have to call it once, instead of potentially looping the tags twice. Reviewed-by: Omar Sandoval <osandov@fb.com> Signed-off-by: Jens Axboe <axboe@kernel.dk>
Diffstat (limited to 'block')
-rw-r--r--block/blk-core.c38
-rw-r--r--block/blk-mq.c12
2 files changed, 33 insertions, 17 deletions
diff --git a/block/blk-core.c b/block/blk-core.c
index 6ad2b8602c1d..d836c84ad3da 100644
--- a/block/blk-core.c
+++ b/block/blk-core.c
@@ -1470,17 +1470,12 @@ static void add_acct_request(struct request_queue *q, struct request *rq,
}
static void part_round_stats_single(struct request_queue *q, int cpu,
- struct hd_struct *part, unsigned long now)
+ struct hd_struct *part, unsigned long now,
+ unsigned int inflight)
{
- int inflight[2];
-
- if (now == part->stamp)
- return;
-
- part_in_flight(q, part, inflight);
- if (inflight[0]) {
+ if (inflight) {
__part_stat_add(cpu, part, time_in_queue,
- inflight[0] * (now - part->stamp));
+ inflight * (now - part->stamp));
__part_stat_add(cpu, part, io_ticks, (now - part->stamp));
}
part->stamp = now;
@@ -1505,12 +1500,29 @@ static void part_round_stats_single(struct request_queue *q, int cpu,
*/
void part_round_stats(struct request_queue *q, int cpu, struct hd_struct *part)
{
+ struct hd_struct *part2 = NULL;
unsigned long now = jiffies;
+ unsigned int inflight[2];
+ int stats = 0;
+
+ if (part->stamp != now)
+ stats |= 1;
+
+ if (part->partno) {
+ part2 = &part_to_disk(part)->part0;
+ if (part2->stamp != now)
+ stats |= 2;
+ }
+
+ if (!stats)
+ return;
+
+ part_in_flight(q, part, inflight);
- if (part->partno)
- part_round_stats_single(q, cpu, &part_to_disk(part)->part0,
- now);
- part_round_stats_single(q, cpu, part, now);
+ if (stats & 2)
+ part_round_stats_single(q, cpu, part2, now, inflight[1]);
+ if (stats & 1)
+ part_round_stats_single(q, cpu, part, now, inflight[0]);
}
EXPORT_SYMBOL_GPL(part_round_stats);
diff --git a/block/blk-mq.c b/block/blk-mq.c
index 0dfc7a9984b6..fe764ca16993 100644
--- a/block/blk-mq.c
+++ b/block/blk-mq.c
@@ -97,11 +97,15 @@ static void blk_mq_check_inflight(struct blk_mq_hw_ctx *hctx,
if (test_bit(REQ_ATOM_STARTED, &rq->atomic_flags) &&
!test_bit(REQ_ATOM_COMPLETE, &rq->atomic_flags)) {
/*
- * Count as inflight if it either matches the partition we
- * asked for, or if it's the root
+ * index[0] counts the specific partition that was asked
+ * for. index[1] counts the ones that are active on the
+ * whole device, so increment that if mi->part is indeed
+ * a partition, and not a whole device.
*/
- if (rq->part == mi->part || mi->part->partno)
+ if (rq->part == mi->part)
mi->inflight[0]++;
+ if (mi->part->partno)
+ mi->inflight[1]++;
}
}
@@ -110,7 +114,7 @@ void blk_mq_in_flight(struct request_queue *q, struct hd_struct *part,
{
struct mq_inflight mi = { .part = part, .inflight = inflight, };
- inflight[0] = 0;
+ inflight[0] = inflight[1] = 0;
blk_mq_queue_tag_busy_iter(q, blk_mq_check_inflight, &mi);
}