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kyber: add tracepoints

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When debugging Kyber, it's really useful to know what latencies we've
been having, how the domain depths have been adjusted, and if we've
actually been throttling. Add three tracepoints, kyber_latency,
kyber_adjust, and kyber_throttled, to record that.

Signed-off-by: Omar Sandoval <osandov@fb.com>
Signed-off-by: Jens Axboe <axboe@kernel.dk>
This commit is contained in:
Omar Sandoval
2018-09-27 15:55:55 -07:00
committed by Jens Axboe
parent 6e25cb01ea
commit 6c3b7af1c9
2 changed files with 130 additions and 18 deletions
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96
include/trace/events/kyber.h Normal file
View File

@@ -0,0 +1,96 @@
/* SPDX-License-Identifier: GPL-2.0 */
#undef TRACE_SYSTEM
#define TRACE_SYSTEM kyber
#if !defined(_TRACE_KYBER_H) || defined(TRACE_HEADER_MULTI_READ)
#define _TRACE_KYBER_H
#include <linux/blkdev.h>
#include <linux/tracepoint.h>
#define DOMAIN_LEN 16
#define LATENCY_TYPE_LEN 8
TRACE_EVENT(kyber_latency,
TP_PROTO(struct request_queue *q, const char *domain, const char *type,
unsigned int percentile, unsigned int numerator,
unsigned int denominator, unsigned int samples),
TP_ARGS(q, domain, type, percentile, numerator, denominator, samples),
TP_STRUCT__entry(
__field( dev_t, dev )
__array( char, domain, DOMAIN_LEN )
__array( char, type, LATENCY_TYPE_LEN )
__field( u8, percentile )
__field( u8, numerator )
__field( u8, denominator )
__field( unsigned int, samples )
),
TP_fast_assign(
__entry->dev = disk_devt(dev_to_disk(kobj_to_dev(q->kobj.parent)));
strlcpy(__entry->domain, domain, DOMAIN_LEN);
strlcpy(__entry->type, type, DOMAIN_LEN);
__entry->percentile = percentile;
__entry->numerator = numerator;
__entry->denominator = denominator;
__entry->samples = samples;
),
TP_printk("%d,%d %s %s p%u %u/%u samples=%u",
MAJOR(__entry->dev), MINOR(__entry->dev), __entry->domain,
__entry->type, __entry->percentile, __entry->numerator,
__entry->denominator, __entry->samples)
);
TRACE_EVENT(kyber_adjust,
TP_PROTO(struct request_queue *q, const char *domain,
unsigned int depth),
TP_ARGS(q, domain, depth),
TP_STRUCT__entry(
__field( dev_t, dev )
__array( char, domain, DOMAIN_LEN )
__field( unsigned int, depth )
),
TP_fast_assign(
__entry->dev = disk_devt(dev_to_disk(kobj_to_dev(q->kobj.parent)));
strlcpy(__entry->domain, domain, DOMAIN_LEN);
__entry->depth = depth;
),
TP_printk("%d,%d %s %u",
MAJOR(__entry->dev), MINOR(__entry->dev), __entry->domain,
__entry->depth)
);
TRACE_EVENT(kyber_throttled,
TP_PROTO(struct request_queue *q, const char *domain),
TP_ARGS(q, domain),
TP_STRUCT__entry(
__field( dev_t, dev )
__array( char, domain, DOMAIN_LEN )
),
TP_fast_assign(
__entry->dev = disk_devt(dev_to_disk(kobj_to_dev(q->kobj.parent)));
strlcpy(__entry->domain, domain, DOMAIN_LEN);
),
TP_printk("%d,%d %s", MAJOR(__entry->dev), MINOR(__entry->dev),
__entry->domain)
);
#define _TRACE_KYBER_H
#endif /* _TRACE_KYBER_H */
/* This part must be outside protection */
#include <trace/define_trace.h>