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perf report: Parse time quantum

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Many workloads change over time. 'perf report' currently aggregates the
whole time range reported in perf.data.

This patch adds an option for a time quantum to quantisize the perf.data
over time.

This just adds the option, will be used in follow on patches for a time
sort key.

Signed-off-by: Andi Kleen <ak@linux.intel.com>
Cc: Jiri Olsa <jolsa@kernel.org>
Cc: Namhyung Kim <namhyung@kernel.org>
Link: http://lkml.kernel.org/r/20190305144758.12397-6-andi@firstfloor.org
[ Use NSEC_PER_[MU]SEC ]
Signed-off-by: Arnaldo Carvalho de Melo <acme@redhat.com>
This commit is contained in:
Andi Kleen
2019-03-05 06:47:48 -08:00
committed by Arnaldo Carvalho de Melo
parent f8c856cb2c
commit 2a1292cbd4
4 changed files with 49 additions and 0 deletions
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42
tools/perf/builtin-report.c
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@@ -47,9 +47,11 @@
#include <errno.h>
#include <inttypes.h>
#include <regex.h>
#include "sane_ctype.h"
#include <signal.h>
#include <linux/bitmap.h>
#include <linux/stringify.h>
#include <linux/time64.h>
#include <sys/types.h>
#include <sys/stat.h>
#include <unistd.h>
@@ -926,6 +928,43 @@ report_parse_callchain_opt(const struct option *opt, const char *arg, int unset)
return parse_callchain_report_opt(arg);
}
static int
parse_time_quantum(const struct option *opt, const char *arg,
int unset __maybe_unused)
{
unsigned long *time_q = opt->value;
char *end;
*time_q = strtoul(arg, &end, 0);
if (end == arg)
goto parse_err;
if (*time_q == 0) {
pr_err("time quantum cannot be 0");
return -1;
}
while (isspace(*end))
end++;
if (*end == 0)
return 0;
if (!strcmp(end, "s")) {
*time_q *= NSEC_PER_SEC;
return 0;
}
if (!strcmp(end, "ms")) {
*time_q *= NSEC_PER_MSEC;
return 0;
}
if (!strcmp(end, "us")) {
*time_q *= NSEC_PER_USEC;
return 0;
}
if (!strcmp(end, "ns"))
return 0;
parse_err:
pr_err("Cannot parse time quantum `%s'\n", arg);
return -1;
}
int
report_parse_ignore_callees_opt(const struct option *opt __maybe_unused,
const char *arg, int unset __maybe_unused)
@@ -1148,6 +1187,9 @@ int cmd_report(int argc, const char **argv)
"Set percent type local/global-period/hits",
annotate_parse_percent_type),
OPT_BOOLEAN(0, "ns", &symbol_conf.nanosecs, "Show times in nanosecs"),
OPT_CALLBACK(0, "time-quantum", &symbol_conf.time_quantum, "time (ms|us|ns|s)",
"Set time quantum for time sort key (default 100ms)",
parse_time_quantum),
OPT_END()
};
struct perf_data data = {