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blk-mq: expose write hints through debugfs

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Useful to verify that things are working the way they should.
Reading the file will return number of kb written with each
write hint. Writing the file will reset the statistics. No care
is taken to ensure that we don't race on updates.

Drivers will write to q->write_hints[] if they handle a given
write hint.

Reviewed-by: Andreas Dilger <adilger@dilger.ca>
Reviewed-by: Martin K. Petersen <martin.petersen@oracle.com>
Reviewed-by: Christoph Hellwig <hch@lst.de>
Signed-off-by: Jens Axboe <axboe@kernel.dk>
This commit is contained in:
Jens Axboe 2017-06-26 08:15:27 -06:00
parent cb6934f8ea
commit f793dfd3f3
2 changed files with 27 additions and 0 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

24
block/blk-mq-debugfs.c
View File

@ -135,6 +135,29 @@ static void print_stat(struct seq_file *m, struct blk_rq_stat *stat)
}
}
static int queue_write_hint_show(void *data, struct seq_file *m)
{
struct request_queue *q = data;
int i;
for (i = 0; i < BLK_MAX_WRITE_HINTS; i++)
seq_printf(m, "hint%d: %llu\n", i, q->write_hints[i]);
return 0;
}
static ssize_t queue_write_hint_store(void *data, const char __user *buf,
size_t count, loff_t *ppos)
{
struct request_queue *q = data;
int i;
for (i = 0; i < BLK_MAX_WRITE_HINTS; i++)
q->write_hints[i] = 0;
return count;
}
static int queue_poll_stat_show(void *data, struct seq_file *m)
{
struct request_queue *q = data;
@ -730,6 +753,7 @@ static const struct blk_mq_debugfs_attr blk_mq_debugfs_queue_attrs[] = {
{"poll_stat", 0400, queue_poll_stat_show},
{"requeue_list", 0400, .seq_ops = &queue_requeue_list_seq_ops},
{"state", 0600, queue_state_show, queue_state_write},
{"write_hints", 0600, queue_write_hint_show, queue_write_hint_store},
{},
};

3
include/linux/blkdev.h
View File

@ -596,6 +596,9 @@ struct request_queue {
void *rq_alloc_data;
struct work_struct release_work;
#define BLK_MAX_WRITE_HINTS 5
u64 write_hints[BLK_MAX_WRITE_HINTS];
};
#define QUEUE_FLAG_QUEUED 1 /* uses generic tag queueing */