Commit d7e3621a authored by Omar Sandoval's avatar Omar Sandoval Committed by Jens Axboe
Browse files

blk-mq: add tags and sched_tags bitmaps to debugfs



These can be used to debug issues like tag leaks and stuck requests.
Reviewed-by: default avatarHannes Reinecke <hare@suse.com>
Signed-off-by: default avatarOmar Sandoval <osandov@fb.com>
Signed-off-by: default avatarJens Axboe <axboe@fb.com>
parent d96b37c0
......@@ -197,6 +197,30 @@ static const struct file_operations hctx_tags_fops = {
.release = single_release,
};
static int hctx_tags_bitmap_show(struct seq_file *m, void *v)
{
struct blk_mq_hw_ctx *hctx = m->private;
struct request_queue *q = hctx->queue;
mutex_lock(&q->sysfs_lock);
if (hctx->tags)
sbitmap_bitmap_show(&hctx->tags->bitmap_tags.sb, m);
mutex_unlock(&q->sysfs_lock);
return 0;
}
static int hctx_tags_bitmap_open(struct inode *inode, struct file *file)
{
return single_open(file, hctx_tags_bitmap_show, inode->i_private);
}
static const struct file_operations hctx_tags_bitmap_fops = {
.open = hctx_tags_bitmap_open,
.read = seq_read,
.llseek = seq_lseek,
.release = single_release,
};
static int hctx_sched_tags_show(struct seq_file *m, void *v)
{
struct blk_mq_hw_ctx *hctx = m->private;
......@@ -222,6 +246,30 @@ static const struct file_operations hctx_sched_tags_fops = {
.release = single_release,
};
static int hctx_sched_tags_bitmap_show(struct seq_file *m, void *v)
{
struct blk_mq_hw_ctx *hctx = m->private;
struct request_queue *q = hctx->queue;
mutex_lock(&q->sysfs_lock);
if (hctx->sched_tags)
sbitmap_bitmap_show(&hctx->sched_tags->bitmap_tags.sb, m);
mutex_unlock(&q->sysfs_lock);
return 0;
}
static int hctx_sched_tags_bitmap_open(struct inode *inode, struct file *file)
{
return single_open(file, hctx_sched_tags_bitmap_show, inode->i_private);
}
static const struct file_operations hctx_sched_tags_bitmap_fops = {
.open = hctx_sched_tags_bitmap_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;
......@@ -269,7 +317,9 @@ static const struct blk_mq_debugfs_attr blk_mq_debugfs_hctx_attrs[] = {
{"dispatch", 0400, &hctx_dispatch_fops},
{"ctx_map", 0400, &hctx_ctx_map_fops},
{"tags", 0400, &hctx_tags_fops},
{"tags_bitmap", 0400, &hctx_tags_bitmap_fops},
{"sched_tags", 0400, &hctx_sched_tags_fops},
{"sched_tags_bitmap", 0400, &hctx_sched_tags_bitmap_fops},
};
static const struct blk_mq_debugfs_attr blk_mq_debugfs_ctx_attrs[] = {
......
Markdown is supported
0% or .
You are about to add 0 people to the discussion. Proceed with caution.
Finish editing this message first!
Please register or to comment