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blk-mq: expose write hints through debugfs
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>
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@ -135,6 +135,29 @@ static void print_stat(struct seq_file *m, struct blk_rq_stat *stat)
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}
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}
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static int queue_write_hint_show(void *data, struct seq_file *m)
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{
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struct request_queue *q = data;
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int i;
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for (i = 0; i < BLK_MAX_WRITE_HINTS; i++)
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seq_printf(m, "hint%d: %llu\n", i, q->write_hints[i]);
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return 0;
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}
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static ssize_t queue_write_hint_store(void *data, const char __user *buf,
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size_t count, loff_t *ppos)
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{
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struct request_queue *q = data;
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int i;
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for (i = 0; i < BLK_MAX_WRITE_HINTS; i++)
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q->write_hints[i] = 0;
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return count;
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}
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static int queue_poll_stat_show(void *data, struct seq_file *m)
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{
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struct request_queue *q = data;
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@ -730,6 +753,7 @@ static const struct blk_mq_debugfs_attr blk_mq_debugfs_queue_attrs[] = {
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{"poll_stat", 0400, queue_poll_stat_show},
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{"requeue_list", 0400, .seq_ops = &queue_requeue_list_seq_ops},
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{"state", 0600, queue_state_show, queue_state_write},
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{"write_hints", 0600, queue_write_hint_show, queue_write_hint_store},
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{},
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};
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@ -596,6 +596,9 @@ struct request_queue {
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void *rq_alloc_data;
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struct work_struct release_work;
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#define BLK_MAX_WRITE_HINTS 5
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u64 write_hints[BLK_MAX_WRITE_HINTS];
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};
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#define QUEUE_FLAG_QUEUED 1 /* uses generic tag queueing */
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