[PATCH 06/10] blk-mq: export software queue pending map to debugfs
From: Omar Sandoval <osandov@osandov.com>
Date: 2017-01-23 19:00:24
Subsystem:
block layer, the rest · Maintainers:
Jens Axboe, Linus Torvalds
From: Omar Sandoval <redacted> This is useful for debugging problems where we've gotten stuck with requests in the software queues. Signed-off-by: Omar Sandoval <redacted> --- block/blk-mq-debugfs.c | 15 +++++++++++++++ 1 file changed, 15 insertions(+)
diff --git a/block/blk-mq-debugfs.c b/block/blk-mq-debugfs.c
index ee947f2f605b..4ee6ab28f56f 100644
--- a/block/blk-mq-debugfs.c
+++ b/block/blk-mq-debugfs.c@@ -134,6 +134,20 @@ static const struct file_operations hctx_dispatch_fops = { .release = seq_release, }; +static int hctx_ctx_map_open(struct inode *inode, struct file *file) +{ + struct blk_mq_hw_ctx *hctx = inode->i_private; + + return single_open(file, sbitmap_bitmap_show, &hctx->ctx_map); +} + +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 +193,7 @@ 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[] = {
--
2.11.0