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| author | Bart Van Assche <bart.vanassche@wdc.com> | 2018-02-27 16:32:14 -0800 |
|---|---|---|
| committer | Jens Axboe <axboe@kernel.dk> | 2018-02-28 12:23:35 -0700 |
| commit | 18bc42308699522b57fd599401c03ad561f422ef (patch) | |
| tree | f83eb2e88c180612a859e0e36be78cf0afaff78b /block/blk-mq-debugfs.c | |
| parent | 1209cb7fa4afcd7f652a70e1d2028686ec28a7a5 (diff) | |
| download | lwn-18bc42308699522b57fd599401c03ad561f422ef.tar.gz lwn-18bc42308699522b57fd599401c03ad561f422ef.zip | |
blk-mq-debugfs: Show zone locking information
When debugging the ZBC code in the mq-deadline scheduler it is very
important to know which zones are locked and which zones are not
locked. Hence this patch that exports the zone locking information
through debugfs.
Cc: Omar Sandoval <osandov@fb.com>
Cc: Ming Lei <ming.lei@redhat.com>
Cc: Hannes Reinecke <hare@suse.de>
Cc: Johannes Thumshirn <jthumshirn@suse.de>
Reviewed-by: Damien Le Moal <damien.lemoal@wdc.com>
Tested-by: Damien Le Moal <damien.lemoal@wdc.com>
Signed-off-by: Bart Van Assche <bart.vanassche@wdc.com>
Signed-off-by: Jens Axboe <axboe@kernel.dk>
Diffstat (limited to 'block/blk-mq-debugfs.c')
| -rw-r--r-- | block/blk-mq-debugfs.c | 16 |
1 files changed, 16 insertions, 0 deletions
diff --git a/block/blk-mq-debugfs.c b/block/blk-mq-debugfs.c index 9547569aa619..bd21d5b9f65f 100644 --- a/block/blk-mq-debugfs.c +++ b/block/blk-mq-debugfs.c @@ -206,11 +206,27 @@ static ssize_t queue_write_hint_store(void *data, const char __user *buf, return count; } +static int queue_zone_wlock_show(void *data, struct seq_file *m) +{ + struct request_queue *q = data; + unsigned int i; + + if (!q->seq_zones_wlock) + return 0; + + for (i = 0; i < blk_queue_nr_zones(q); i++) + if (test_bit(i, q->seq_zones_wlock)) + seq_printf(m, "%u\n", i); + + return 0; +} + 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 }, + { "zone_wlock", 0400, queue_zone_wlock_show, NULL }, { }, }; |