From: Hannes Reinecke <hare@suse.de>
Date: Thu, 7 Jun 2018 10:38:47 +0200
Subject: [PATCH] nvme: add bio remapping tracepoint
References: bsc#1054245
Git-commit: 2796b569591c6f0681303f148a55e50c2cc8304a
Patch-mainline: v4.18-rc1
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>
Signed-off-by: Hannes Reinecke <hare@suse.de>
---
drivers/nvme/host/multipath.c | 4 ++++
1 file changed, 4 insertions(+)
diff --git a/drivers/nvme/host/multipath.c b/drivers/nvme/host/multipath.c
index 0949633ac87c..4e3490ddf0ee 100644
--- a/drivers/nvme/host/multipath.c
+++ b/drivers/nvme/host/multipath.c
@@ -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");
--
2.12.3