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blk-wbt: export internal state via debugfs

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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>
This commit is contained in:
Ming Lei 2018-12-17 09:46:01 +08:00 committed by Jens Axboe
parent cc56694f13
commit d19afebca4
1 changed files with 91 additions and 0 deletions
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91
block/blk-wbt.c
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@ -715,6 +715,94 @@ void wbt_disable_default(struct request_queue *q)
} }
EXPORT_SYMBOL_GPL(wbt_disable_default); EXPORT_SYMBOL_GPL(wbt_disable_default);
#ifdef CONFIG_BLK_DEBUG_FS
static int wbt_curr_win_nsec_show(void *data, struct seq_file *m)
{
struct rq_qos *rqos = data;
struct rq_wb *rwb = RQWB(rqos);
seq_printf(m, "%llu\n", rwb->cur_win_nsec);
return 0;
}
static int wbt_enabled_show(void *data, struct seq_file *m)
{
struct rq_qos *rqos = data;
struct rq_wb *rwb = RQWB(rqos);
seq_printf(m, "%d\n", rwb->enable_state);
return 0;
}
static int wbt_id_show(void *data, struct seq_file *m)
{
struct rq_qos *rqos = data;
seq_printf(m, "%u\n", rqos->id);
return 0;
}
static int wbt_inflight_show(void *data, struct seq_file *m)
{
struct rq_qos *rqos = data;
struct rq_wb *rwb = RQWB(rqos);
int i;
for (i = 0; i < WBT_NUM_RWQ; i++)
seq_printf(m, "%d: inflight %d\n", i,
atomic_read(&rwb->rq_wait[i].inflight));
return 0;
}
static int wbt_min_lat_nsec_show(void *data, struct seq_file *m)
{
struct rq_qos *rqos = data;
struct rq_wb *rwb = RQWB(rqos);
seq_printf(m, "%lu\n", rwb->min_lat_nsec);
return 0;
}
static int wbt_unknown_cnt_show(void *data, struct seq_file *m)
{
struct rq_qos *rqos = data;
struct rq_wb *rwb = RQWB(rqos);
seq_printf(m, "%u\n", rwb->unknown_cnt);
return 0;
}
static int wbt_normal_show(void *data, struct seq_file *m)
{
struct rq_qos *rqos = data;
struct rq_wb *rwb = RQWB(rqos);
seq_printf(m, "%u\n", rwb->wb_normal);
return 0;
}
static int wbt_background_show(void *data, struct seq_file *m)
{
struct rq_qos *rqos = data;
struct rq_wb *rwb = RQWB(rqos);
seq_printf(m, "%u\n", rwb->wb_background);
return 0;
}
static const struct blk_mq_debugfs_attr wbt_debugfs_attrs[] = {
{"curr_win_nsec", 0400, wbt_curr_win_nsec_show},
{"enabled", 0400, wbt_enabled_show},
{"id", 0400, wbt_id_show},
{"inflight", 0400, wbt_inflight_show},
{"min_lat_nsec", 0400, wbt_min_lat_nsec_show},
{"unknown_cnt", 0400, wbt_unknown_cnt_show},
{"wb_normal", 0400, wbt_normal_show},
{"wb_background", 0400, wbt_background_show},
{},
};
#endif
static struct rq_qos_ops wbt_rqos_ops = { static struct rq_qos_ops wbt_rqos_ops = {
.throttle = wbt_wait, .throttle = wbt_wait,
.issue = wbt_issue, .issue = wbt_issue,
@ -723,6 +811,9 @@ static struct rq_qos_ops wbt_rqos_ops = {
.done = wbt_done, .done = wbt_done,
.cleanup = wbt_cleanup, .cleanup = wbt_cleanup,
.exit = wbt_exit, .exit = wbt_exit,
#ifdef CONFIG_BLK_DEBUG_FS
.debugfs_attrs = wbt_debugfs_attrs,
#endif
}; };
int wbt_init(struct request_queue *q) int wbt_init(struct request_queue *q)