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Message-Id: <1483431600-19887-8-git-send-email-jolsa@kernel.org>
Date: Tue, 3 Jan 2017 09:20:00 +0100
From: Jiri Olsa <jolsa@...nel.org>
To: Arnaldo Carvalho de Melo <acme@...nel.org>
Cc: David Ahern <dsahern@...il.com>,
Namhyung Kim <namhyung@...nel.org>,
Peter Zijlstra <a.p.zijlstra@...llo.nl>,
Wang Nan <wangnan0@...wei.com>,
lkml <linux-kernel@...r.kernel.org>,
Ingo Molnar <mingo@...nel.org>
Subject: [PATCH 7/7] perf record: Add switch-output time option argument
It's now possible to specify the threshold time for
perf.data like:
$ perf record --switch-output=30s ...
Once it's reached, the current data are dumped in to the
perf.data.<timestamp> file and session does on.
$ perf record --switch-output=30s ...
[ perf record: dump data: Woken up 44 times ]
[ perf record: Dump perf.data.2017010213043746 ]
...
The time is expected to be a number with appended unit
character - s/m/h/d.
Signed-off-by: Jiri Olsa <jolsa@...nel.org>
Cc: David Ahern <dsahern@...il.com>
Cc: Namhyung Kim <namhyung@...nel.org>
Cc: Peter Zijlstra <a.p.zijlstra@...llo.nl>
Cc: Wang Nan <wangnan0@...wei.com>
Link: http://lkml.kernel.org/n/tip-2u6y3h89c0guejpn1nwv32lc@git.kernel.org
---
tools/perf/Documentation/perf-record.txt | 2 ++
tools/perf/builtin-record.c | 44 ++++++++++++++++++++++++++++++--
2 files changed, 44 insertions(+), 2 deletions(-)
diff --git a/tools/perf/Documentation/perf-record.txt b/tools/perf/Documentation/perf-record.txt
index d838354df417..176f85e89eaa 100644
--- a/tools/perf/Documentation/perf-record.txt
+++ b/tools/perf/Documentation/perf-record.txt
@@ -427,6 +427,8 @@ based on 'mode' value:
"signal" - when receiving a SIGUSR2 (default value) or
<size> - when reaching the size threshold, size is expected to
be a number with appended unit character - B/K/M/G
+ <time> - when reaching the time threshold, size is expected to
+ be a number with appended unit character - s/m/h/d
A possible use case is to, given an external event, slice the perf.data file
that gets then processed, possibly via a perf script, to decide if that
diff --git a/tools/perf/builtin-record.c b/tools/perf/builtin-record.c
index 42321a0fa80e..972272efba47 100644
--- a/tools/perf/builtin-record.c
+++ b/tools/perf/builtin-record.c
@@ -50,6 +50,7 @@ struct switch_output {
bool enabled;
bool signal;
unsigned long size;
+ unsigned long time;
const char *str;
bool set;
};
@@ -91,6 +92,12 @@ static bool switch_output_size(struct record *rec)
(rec->bytes_written >= rec->switch_output.size);
}
+static bool switch_output_time(struct record *rec)
+{
+ return rec->switch_output.time &&
+ trigger_is_ready(&switch_output_trigger);
+}
+
static int record__write(struct record *rec, void *bf, size_t size)
{
if (perf_data_file__write(rec->session->file, bf, size) < 0) {
@@ -737,6 +744,7 @@ static void workload_exec_failed_signal(int signo __maybe_unused,
}
static void snapshot_sig_handler(int sig);
+static void alarm_sig_handler(int sig);
int __weak
perf_event__synth_time_conv(const struct perf_event_mmap_page *pc __maybe_unused,
@@ -1068,6 +1076,10 @@ static int __cmd_record(struct record *rec, int argc, const char **argv)
err = fd;
goto out_child;
}
+
+ /* re-arm the alarm */
+ if (rec->switch_output.time)
+ alarm(rec->switch_output.time);
}
if (hits == rec->samples) {
@@ -1387,6 +1399,13 @@ static int switch_output_setup(struct switch_output *s)
{ .tag = 'G', .mult = 1 << 30 },
{ .tag = 0 },
};
+ static struct parse_tag tags_time[] = {
+ { .tag = 's', .mult = 1 },
+ { .tag = 'm', .mult = 60 },
+ { .tag = 'h', .mult = 60*60 },
+ { .tag = 'd', .mult = 60*60*24 },
+ { .tag = 0 },
+ };
if (!strcmp(s->str, "signal")) {
s->signal = true;
@@ -1401,6 +1420,14 @@ static int switch_output_setup(struct switch_output *s)
goto enabled;
}
+ val = parse_tag_value(s->str, tags_time);
+ if (val != (unsigned long) -1) {
+ s->time = val;
+ pr_debug("switch-output with %s time threshold (%lu seconds)\n",
+ s->str, s->time);
+ goto enabled;
+ }
+
return -1;
enabled:
@@ -1576,8 +1603,8 @@ static struct option __record_options[] = {
OPT_BOOLEAN(0, "timestamp-filename", &record.timestamp_filename,
"append timestamp to output filename"),
OPT_STRING_OPTARG_SET(0, "switch-output", &record.switch_output.str,
- &record.switch_output.set, "signal,size",
- "Switch output when receive SIGUSR2 or cross size threshold",
+ &record.switch_output.set, "signal,size,time",
+ "Switch output when receive SIGUSR2 or cross size,time threshold",
"signal"),
OPT_BOOLEAN(0, "dry-run", &dry_run,
"Parse options then exit"),
@@ -1645,6 +1672,11 @@ int cmd_record(int argc, const char **argv, const char *prefix __maybe_unused)
if (rec->switch_output.enabled)
rec->timestamp_filename = true;
+ if (rec->switch_output.time) {
+ signal(SIGALRM, alarm_sig_handler);
+ alarm(rec->switch_output.time);
+ }
+
if (!rec->itr) {
rec->itr = auxtrace_record__init(rec->evlist, &err);
if (err)
@@ -1797,3 +1829,11 @@ static void snapshot_sig_handler(int sig __maybe_unused)
if (switch_output_signal(rec))
trigger_hit(&switch_output_trigger);
}
+
+static void alarm_sig_handler(int sig __maybe_unused)
+{
+ struct record *rec = &record;
+
+ if (switch_output_time(rec))
+ trigger_hit(&switch_output_trigger);
+}
--
2.7.4
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