include/trace/events/wbt.h

Source file repositories/reference/linux-study-clean/include/trace/events/wbt.h

File Facts

System
Linux kernel
Corpus path
include/trace/events/wbt.h
Extension
.h
Size
3907 bytes
Lines
159
Domain
Repository Root And Misc
Bucket
include
Inferred role
Repository Root And Misc: implementation source
Status
source implementation candidate

Why This File Exists

Top-level or miscellaneous repository surface. Use this as map coverage unless a later manual pass promotes the file into a deeper subsystem dossier.

Dependency Surface

Detected Declarations

Annotated Snippet

#undef TRACE_SYSTEM
#define TRACE_SYSTEM wbt

#if !defined(_TRACE_WBT_H) || defined(TRACE_HEADER_MULTI_READ)
#define _TRACE_WBT_H

#include <linux/tracepoint.h>
#include "../../../block/blk-wbt.h"

/**
 * wbt_stat - trace stats for blk_wb
 * @stat: array of read/write stats
 */
TRACE_EVENT(wbt_stat,

	TP_PROTO(struct backing_dev_info *bdi, struct blk_rq_stat *stat),

	TP_ARGS(bdi, stat),

	TP_STRUCT__entry(
		__array(char, name, 32)
		__field(s64, rmean)
		__field(u64, rmin)
		__field(u64, rmax)
		__field(s64, rnr_samples)
		__field(s64, rtime)
		__field(s64, wmean)
		__field(u64, wmin)
		__field(u64, wmax)
		__field(s64, wnr_samples)
		__field(s64, wtime)
	),

	TP_fast_assign(
		strscpy(__entry->name, bdi_dev_name(bdi),
			ARRAY_SIZE(__entry->name));
		__entry->rmean		= stat[0].mean;
		__entry->rmin		= stat[0].min;
		__entry->rmax		= stat[0].max;
		__entry->rnr_samples	= stat[0].nr_samples;
		__entry->wmean		= stat[1].mean;
		__entry->wmin		= stat[1].min;
		__entry->wmax		= stat[1].max;
		__entry->wnr_samples	= stat[1].nr_samples;
	),

	TP_printk("%s: rmean=%llu, rmin=%llu, rmax=%llu, rsamples=%llu, "
		  "wmean=%llu, wmin=%llu, wmax=%llu, wsamples=%llu",
		  __entry->name, __entry->rmean, __entry->rmin, __entry->rmax,
		  __entry->rnr_samples, __entry->wmean, __entry->wmin,
		  __entry->wmax, __entry->wnr_samples)
);

/**
 * wbt_lat - trace latency event
 * @lat: latency trigger
 */
TRACE_EVENT(wbt_lat,

	TP_PROTO(struct backing_dev_info *bdi, unsigned long lat),

	TP_ARGS(bdi, lat),

	TP_STRUCT__entry(
		__array(char, name, 32)
		__field(unsigned long, lat)
	),

	TP_fast_assign(
		strscpy(__entry->name, bdi_dev_name(bdi),
			ARRAY_SIZE(__entry->name));
		__entry->lat = div_u64(lat, 1000);
	),

	TP_printk("%s: latency %lluus", __entry->name,
			(unsigned long long) __entry->lat)
);

/**
 * wbt_step - trace wb event step
 * @msg: context message
 * @step: the current scale step count
 * @window: the current monitoring window
 * @bg: the current background queue limit
 * @normal: the current normal writeback limit
 * @max: the current max throughput writeback limit
 */
TRACE_EVENT(wbt_step,

	TP_PROTO(struct backing_dev_info *bdi, const char *msg,

Annotation

Implementation Notes