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nvme: add bio remapping tracepoint 

Adding a tracepoint to trace bio remapping for native nvme multipath.

Signed-off-by: Hannes Reinecke <hare@suse.com>
Reviewed-by: Sagi Grimberg <sagi@grimberg.me>
Signed-off-by: Christoph Hellwig <hch@lst.de>
This commit is contained in:
Hannes Reinecke 2018-06-07 10:38:47 +02:00 committed by Christoph Hellwig
parent 16001c1072
commit 2796b56959
1 changed files with 4 additions and 0 deletions
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4
drivers/nvme/host/multipath.c
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@ -12,6 +12,7 @@
*/
#include <linux/moduleparam.h>
#include <trace/events/block.h>
#include "nvme.h"
static bool multipath = true;
@ -111,6 +112,9 @@ static blk_qc_t nvme_ns_head_make_request(struct request_queue *q,
if (likely(ns)) {
bio->bi_disk = ns->disk;
bio->bi_opf |= REQ_NVME_MPATH;
trace_block_bio_remap(bio->bi_disk->queue, bio,
disk_devt(ns->head->disk),
bio->bi_iter.bi_sector);
ret = direct_make_request(bio);
} else if (!list_empty_careful(&head->list)) {
dev_warn_ratelimited(dev, "no path available - requeuing I/O\n");