diff options
| author | Omar Sandoval <osandov@fb.com> | 2017-01-25 19:06:45 +0300 |
|---|---|---|
| committer | Jens Axboe <axboe@fb.com> | 2017-01-27 18:17:44 +0300 |
| commit | 0bfa5288a78176be8a895ce65dbbf61f63f54b96 (patch) | |
| tree | 89dca1c2d7628602a986c54c674d2c187be92318 | |
| parent | 24af1ccfe12adddbe17d11801e1689791a4cc282 (diff) | |
| download | linux-0bfa5288a78176be8a895ce65dbbf61f63f54b96.tar.xz | |
blk-mq: export software queue pending map to debugfs
This is useful for debugging problems where we've gotten stuck with
requests in the software queues.
Reviewed-by: Hannes Reinecke <hare@suse.com>
Signed-off-by: Omar Sandoval <osandov@fb.com>
Signed-off-by: Jens Axboe <axboe@fb.com>
| -rw-r--r-- | block/blk-mq-debugfs.c | 21 |
1 files changed, 21 insertions, 0 deletions
diff --git a/block/blk-mq-debugfs.c b/block/blk-mq-debugfs.c index ee947f2f605b..857bdadc6b1f 100644 --- a/block/blk-mq-debugfs.c +++ b/block/blk-mq-debugfs.c @@ -134,6 +134,26 @@ static const struct file_operations hctx_dispatch_fops = { .release = seq_release, }; +static int hctx_ctx_map_show(struct seq_file *m, void *v) +{ + struct blk_mq_hw_ctx *hctx = m->private; + + sbitmap_bitmap_show(&hctx->ctx_map, m); + return 0; +} + +static int hctx_ctx_map_open(struct inode *inode, struct file *file) +{ + return single_open(file, hctx_ctx_map_show, inode->i_private); +} + +static const struct file_operations hctx_ctx_map_fops = { + .open = hctx_ctx_map_open, + .read = seq_read, + .llseek = seq_lseek, + .release = single_release, +}; + static void *ctx_rq_list_start(struct seq_file *m, loff_t *pos) { struct blk_mq_ctx *ctx = m->private; @@ -179,6 +199,7 @@ static const struct blk_mq_debugfs_attr blk_mq_debugfs_hctx_attrs[] = { {"state", 0400, &hctx_state_fops}, {"flags", 0400, &hctx_flags_fops}, {"dispatch", 0400, &hctx_dispatch_fops}, + {"ctx_map", 0400, &hctx_ctx_map_fops}, }; static const struct blk_mq_debugfs_attr blk_mq_debugfs_ctx_attrs[] = { |