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Commit fdf9dc4b authored by David Ahern's avatar David Ahern Committed by Arnaldo Carvalho de Melo
Browse files

perf tools: Add time-based utility functions 



Add function to parse a user time string of the form <start>,<stop>
where start and stop are time in sec.nsec format. Both start and stop
times are optional.

Add function to determine if a sample time is within a given time
time window of interest.

Signed-off-by: default avatarDavid Ahern <dsahern@gmail.com>
Acked-by: default avatarNamhyung Kim <namhyung@kernel.org>
Cc: Jiri Olsa <jolsa@kernel.org>
Cc: Peter Zijlstra <peterz@infradead.org>
Link: http://lkml.kernel.org/r/1480439746-42695-2-git-send-email-dsahern@gmail.com


Signed-off-by: default avatarArnaldo Carvalho de Melo <acme@redhat.com>
parent 64eff7d9

tools/perf/util/Build

+1 −0
Original line number Diff line number Diff line
@@ -87,6 +87,7 @@ libperf-y += help-unknown-cmd.o 
libperf-y += mem-events.o

libperf-y += vsprintf.o

libperf-y += drv_configs.o

libperf-y += time-utils.o



libperf-$(CONFIG_LIBBPF) += bpf-loader.o

libperf-$(CONFIG_BPF_PROLOGUE) += bpf-prologue.o

tools/perf/util/time-utils.c

0 → 100644
+85 −0
Original line number Diff line number Diff line 
#include <string.h>

#include <sys/time.h>

#include <time.h>

#include <errno.h>

#include <inttypes.h>



#include "perf.h"

#include "debug.h"

#include "time-utils.h"

#include "util.h"



static int parse_timestr_sec_nsec(struct perf_time_interval *ptime,

				  char *start_str, char *end_str)

{

	if (start_str && (*start_str != '\0') &&

	    (parse_nsec_time(start_str, &ptime->start) != 0)) {

		return -1;

	}



	if (end_str && (*end_str != '\0') &&

	    (parse_nsec_time(end_str, &ptime->end) != 0)) {

		return -1;

	}



	return 0;

}



int perf_time__parse_str(struct perf_time_interval *ptime, const char *ostr)

{

	char *start_str, *end_str;

	char *d, *str;

	int rc = 0;



	if (ostr == NULL || *ostr == '\0')

		return 0;



	/* copy original string because we need to modify it */

	str = strdup(ostr);

	if (str == NULL)

		return -ENOMEM;



	ptime->start = 0;

	ptime->end = 0;



	/* str has the format: <start>,<stop>

	 * variations: <start>,

	 *             ,<stop>

	 *             ,

	 */

	start_str = str;

	d = strchr(start_str, ',');

	if (d) {

		*d = '\0';

		++d;

	}

	end_str = d;



	rc = parse_timestr_sec_nsec(ptime, start_str, end_str);



	free(str);



	/* make sure end time is after start time if it was given */

	if (rc == 0 && ptime->end && ptime->end < ptime->start)

		return -EINVAL;



	pr_debug("start time %" PRIu64 ", ", ptime->start);

	pr_debug("end time %" PRIu64 "\n", ptime->end);



	return rc;

}



bool perf_time__skip_sample(struct perf_time_interval *ptime, u64 timestamp)

{

	/* if time is not set don't drop sample */

	if (timestamp == 0)

		return false;



	/* otherwise compare sample time to time window */

	if ((ptime->start && timestamp < ptime->start) ||

	    (ptime->end && timestamp > ptime->end)) {

		return true;

	}



	return false;

}

tools/perf/util/time-utils.h

0 → 100644
+12 −0
Original line number Diff line number Diff line 
#ifndef _TIME_UTILS_H_

#define _TIME_UTILS_H_



struct perf_time_interval {

	u64 start, end;

};



int perf_time__parse_str(struct perf_time_interval *ptime, const char *ostr);



bool perf_time__skip_sample(struct perf_time_interval *ptime, u64 timestamp);



#endif