Lines Matching +full:lock +full:- +full:latency +full:- +full:ns

1 /* SPDX-License-Identifier: GPL-2.0 */
3  * bch2_time_stats - collect statistics on events that have a duration, with nicely
6  * - percpu buffering of event collection: cheap enough to shotgun
10  *  - number of events
11  *  - maximum event duration ever seen
12  *  - sum of all event durations
13  *  - average event duration, standard and weighted
14  *  - standard deviation of event durations, standard and weighted
18  * deviation and weighted standard deviation, to give an efficient-to-compute
19  * view of current behaviour versus. average behaviour - "did this event source
22  * Particularly useful for tracking down latency issues.
41 const struct time_unit *bch2_pick_time_units(u64 ns);
44  * quantiles - do not use:
46  * Only enabled if bch2_time_stats->quantiles_enabled has been manually set - don't
71 	spinlock_t	lock;
100 	return stats->have_quantiles
101 		? &container_of(stats, struct bch2_time_stats_quantiles, stats)->quantiles
109  * time_stats_update - collect a new event being tracked
111  * @stats	- bch2_time_stats to update
112  * @start	- start time of event, recorded with local_clock()
122  * track_event_change - track state change events
124  * @stats	- bch2_time_stats to update
125  * @v		- new state, true or false
132 	if (v != !!stats->last_event_start) {
134 			bch2_time_stats_update(stats, stats->last_event_start);
135 			stats->last_event_start = 0;
137 			stats->last_event_start = local_clock() ?: 1;
152 	bch2_time_stats_exit(&statq->stats);
156 	bch2_time_stats_init(&statq->stats);
157 	statq->stats.have_quantiles = true;
158 	memset(&statq->quantiles, 0, sizeof(statq->quantiles));