Commit 2a1292cb authored by Andi Kleen's avatar Andi Kleen Committed by Arnaldo Carvalho de Melo

perf report: Parse time quantum

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: default avatarAndi 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: default avatarArnaldo Carvalho de Melo <acme@redhat.com>
parent f8c856cb
......@@ -497,6 +497,10 @@ include::itrace.txt[]
The period/hits keywords set the base the percentage is computed
on - the samples period or the number of samples (hits).
--time-quantum::
Configure time quantum for time sort key. Default 100ms.
Accepts s, us, ms, ns units.
include::callchain-overhead-calculation.txt[]
SEE ALSO
......
......@@ -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 = {
......
......@@ -6,6 +6,7 @@
#include <string.h>
#include <linux/kernel.h>
#include <linux/mman.h>
#include <linux/time64.h>
#include <sys/types.h>
#include <sys/stat.h>
#include <sys/param.h>
......@@ -45,6 +46,7 @@ struct symbol_conf symbol_conf = {
.demangle = true,
.demangle_kernel = false,
.cumulate_callchain = true,
.time_quantum = 100 * NSEC_PER_MSEC, /* 100ms */
.show_hist_headers = true,
.symfs = "",
.event_group = true,
......
......@@ -56,6 +56,7 @@ struct symbol_conf {
*sym_list_str,
*col_width_list_str,
*bt_stop_list_str;
unsigned long time_quantum;
struct strlist *dso_list,
*comm_list,
*sym_list,
......
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