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blk-wbt: export internal state via debugfs
This information is helpful to either investigate issues, or understand wbt's internal behaviour. Cc: Bart Van Assche <bart.vanassche@wdc.com> Cc: Omar Sandoval <osandov@fb.com> Cc: Christoph Hellwig <hch@lst.de> Cc: Josef Bacik <josef@toxicpanda.com> Signed-off-by: Ming Lei <ming.lei@redhat.com> Signed-off-by: Jens Axboe <axboe@kernel.dk>
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@ -715,6 +715,94 @@ void wbt_disable_default(struct request_queue *q)
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}
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EXPORT_SYMBOL_GPL(wbt_disable_default);
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#ifdef CONFIG_BLK_DEBUG_FS
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static int wbt_curr_win_nsec_show(void *data, struct seq_file *m)
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{
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struct rq_qos *rqos = data;
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struct rq_wb *rwb = RQWB(rqos);
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seq_printf(m, "%llu\n", rwb->cur_win_nsec);
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return 0;
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}
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static int wbt_enabled_show(void *data, struct seq_file *m)
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{
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struct rq_qos *rqos = data;
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struct rq_wb *rwb = RQWB(rqos);
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seq_printf(m, "%d\n", rwb->enable_state);
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return 0;
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}
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static int wbt_id_show(void *data, struct seq_file *m)
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{
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struct rq_qos *rqos = data;
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seq_printf(m, "%u\n", rqos->id);
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return 0;
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}
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static int wbt_inflight_show(void *data, struct seq_file *m)
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{
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struct rq_qos *rqos = data;
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struct rq_wb *rwb = RQWB(rqos);
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int i;
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for (i = 0; i < WBT_NUM_RWQ; i++)
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seq_printf(m, "%d: inflight %d\n", i,
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atomic_read(&rwb->rq_wait[i].inflight));
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return 0;
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}
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static int wbt_min_lat_nsec_show(void *data, struct seq_file *m)
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{
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struct rq_qos *rqos = data;
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struct rq_wb *rwb = RQWB(rqos);
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seq_printf(m, "%lu\n", rwb->min_lat_nsec);
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return 0;
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}
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static int wbt_unknown_cnt_show(void *data, struct seq_file *m)
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{
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struct rq_qos *rqos = data;
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struct rq_wb *rwb = RQWB(rqos);
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seq_printf(m, "%u\n", rwb->unknown_cnt);
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return 0;
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}
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static int wbt_normal_show(void *data, struct seq_file *m)
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{
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struct rq_qos *rqos = data;
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struct rq_wb *rwb = RQWB(rqos);
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seq_printf(m, "%u\n", rwb->wb_normal);
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return 0;
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}
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static int wbt_background_show(void *data, struct seq_file *m)
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{
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struct rq_qos *rqos = data;
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struct rq_wb *rwb = RQWB(rqos);
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seq_printf(m, "%u\n", rwb->wb_background);
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return 0;
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}
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static const struct blk_mq_debugfs_attr wbt_debugfs_attrs[] = {
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{"curr_win_nsec", 0400, wbt_curr_win_nsec_show},
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{"enabled", 0400, wbt_enabled_show},
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{"id", 0400, wbt_id_show},
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{"inflight", 0400, wbt_inflight_show},
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{"min_lat_nsec", 0400, wbt_min_lat_nsec_show},
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{"unknown_cnt", 0400, wbt_unknown_cnt_show},
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{"wb_normal", 0400, wbt_normal_show},
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{"wb_background", 0400, wbt_background_show},
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{},
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};
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#endif
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static struct rq_qos_ops wbt_rqos_ops = {
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.throttle = wbt_wait,
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.issue = wbt_issue,
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@ -723,6 +811,9 @@ static struct rq_qos_ops wbt_rqos_ops = {
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.done = wbt_done,
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.cleanup = wbt_cleanup,
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.exit = wbt_exit,
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#ifdef CONFIG_BLK_DEBUG_FS
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.debugfs_attrs = wbt_debugfs_attrs,
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#endif
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};
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int wbt_init(struct request_queue *q)
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