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Date: Tue, 3 Jan 2017 11:20:27 -0300
From: Arnaldo Carvalho de Melo <acme@...nel.org>
To: Jiri Olsa <jolsa@...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: Re: [PATCH 6/7] perf record: Add switch-output size option argument
Em Tue, Jan 03, 2017 at 09:19:59AM +0100, Jiri Olsa escreveu:
> It's now possible to specify the threshold size for
> perf.data like:
>
> $ perf record --switch-output=2G ...
>
> Once it's reached, the current data are dumped in to the
> perf.data.<timestamp> file and session does on.
s/does/goes/g
But:
[root@...et ~]# perf record -F9000 -a --switch-output=1K sleep 5
[ perf record: dump data: Woken up 0 times ]
[ perf record: Dump perf.data.2017010311185502 ]
[ perf record: dump data: Woken up 1 times ]
[ perf record: Dump perf.data.2017010311190003 ]
[ perf record: Woken up 0 times to write data ]
[ perf record: Dump perf.data.2017010311190020 ]
[ perf record: Captured and wrote 2.240 MB perf.data.<timestamp> ]
[root@...et ~]# ls -larth perf.data.*
-rw-------. 1 root root 2.3M Jan 3 11:18 perf.data.2017010311181984
-rw-------. 1 root root 2.3M Jan 3 11:18 perf.data.2017010311182002
-rw-------. 1 root root 2.3M Jan 3 11:18 perf.data.2017010311185502
-rw-------. 1 root root 2.3M Jan 3 11:19 perf.data.2017010311190003
-rw-------. 1 root root 2.3M Jan 3 11:19 perf.data.2017010311190020
[root@...et ~]#
What is that I am missing?
- Arnaldo
> $ perf record --switch-output=2G ...
> [ perf record: dump data: Woken up 7244 times ]
> [ perf record: Dump perf.data.2017010214093746 ]
> ...
>
> The size is expected to be a number with appended unit
> character - B/K/M/G.
>
> 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-xw4x8qj6aojox378q9ley29e@git.kernel.org
> ---
> tools/perf/Documentation/perf-record.txt | 7 +++-
> tools/perf/builtin-record.c | 66 ++++++++++++++++++++++++++------
> 2 files changed, 59 insertions(+), 14 deletions(-)
>
> diff --git a/tools/perf/Documentation/perf-record.txt b/tools/perf/Documentation/perf-record.txt
> index 5054d9147f0f..d838354df417 100644
> --- a/tools/perf/Documentation/perf-record.txt
> +++ b/tools/perf/Documentation/perf-record.txt
> @@ -421,9 +421,12 @@ Configure all used events to run in user space.
> --timestamp-filename
> Append timestamp to output file name.
>
> ---switch-output::
> +--switch-output[=mode]::
> Generate multiple perf.data files, timestamp prefixed, switching to a new one
> -when receiving a SIGUSR2.
> +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
>
> 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 b503e5ebc1e7..42321a0fa80e 100644
> --- a/tools/perf/builtin-record.c
> +++ b/tools/perf/builtin-record.c
> @@ -47,7 +47,9 @@
> #include <linux/time64.h>
>
> struct switch_output {
> + bool enabled;
> bool signal;
> + unsigned long size;
> const char *str;
> bool set;
> };
> @@ -72,6 +74,23 @@ struct record {
> unsigned long long samples;
> };
>
> +static volatile int auxtrace_record__snapshot_started;
> +static DEFINE_TRIGGER(auxtrace_snapshot_trigger);
> +static DEFINE_TRIGGER(switch_output_trigger);
> +
> +static bool switch_output_signal(struct record *rec)
> +{
> + return rec->switch_output.signal &&
> + trigger_is_ready(&switch_output_trigger);
> +}
> +
> +static bool switch_output_size(struct record *rec)
> +{
> + return rec->switch_output.size &&
> + trigger_is_ready(&switch_output_trigger) &&
> + (rec->bytes_written >= rec->switch_output.size);
> +}
> +
> static int record__write(struct record *rec, void *bf, size_t size)
> {
> if (perf_data_file__write(rec->session->file, bf, size) < 0) {
> @@ -80,6 +99,10 @@ static int record__write(struct record *rec, void *bf, size_t size)
> }
>
> rec->bytes_written += size;
> +
> + if (switch_output_size(rec))
> + trigger_hit(&switch_output_trigger);
> +
> return 0;
> }
>
> @@ -199,10 +222,6 @@ static volatile int done;
> static volatile int signr = -1;
> static volatile int child_finished;
>
> -static volatile int auxtrace_record__snapshot_started;
> -static DEFINE_TRIGGER(auxtrace_snapshot_trigger);
> -static DEFINE_TRIGGER(switch_output_trigger);
> -
> static void sig_handler(int sig)
> {
> if (sig == SIGCHLD)
> @@ -848,11 +867,11 @@ static int __cmd_record(struct record *rec, int argc, const char **argv)
> signal(SIGTERM, sig_handler);
> signal(SIGSEGV, sigsegv_handler);
>
> - if (rec->opts.auxtrace_snapshot_mode || rec->switch_output.signal) {
> + if (rec->opts.auxtrace_snapshot_mode || rec->switch_output.enabled) {
> signal(SIGUSR2, snapshot_sig_handler);
> if (rec->opts.auxtrace_snapshot_mode)
> trigger_on(&auxtrace_snapshot_trigger);
> - if (rec->switch_output.signal)
> + if (rec->switch_output.enabled)
> trigger_on(&switch_output_trigger);
> } else {
> signal(SIGUSR2, SIG_IGN);
> @@ -1360,13 +1379,33 @@ static int record__parse_mmap_pages(const struct option *opt,
>
> static int switch_output_setup(struct switch_output *s)
> {
> + unsigned long val;
> + static struct parse_tag tags_size[] = {
> + { .tag = 'B', .mult = 1 },
> + { .tag = 'K', .mult = 1 << 10 },
> + { .tag = 'M', .mult = 1 << 20 },
> + { .tag = 'G', .mult = 1 << 30 },
> + { .tag = 0 },
> + };
> +
> if (!strcmp(s->str, "signal")) {
> s->signal = true;
> pr_debug("switch-output with SIGUSR2 signal\n");
> - return 0;
> + goto enabled;
> + }
> +
> + val = parse_tag_value(s->str, tags_size);
> + if (val != (unsigned long) -1) {
> + s->size = val;
> + pr_debug("switch-output with %s size threshold\n", s->str);
> + goto enabled;
> }
>
> return -1;
> +
> +enabled:
> + s->enabled = true;
> + return 0;
> }
>
> static const char * const __record_usage[] = {
> @@ -1537,8 +1576,9 @@ 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",
> - "Switch output when receive SIGUSR2", "signal"),
> + &record.switch_output.set, "signal,size",
> + "Switch output when receive SIGUSR2 or cross size threshold",
> + "signal"),
> OPT_BOOLEAN(0, "dry-run", &dry_run,
> "Parse options then exit"),
> OPT_END()
> @@ -1602,7 +1642,7 @@ int cmd_record(int argc, const char **argv, const char *prefix __maybe_unused)
> return -EINVAL;
> }
>
> - if (rec->switch_output.signal)
> + if (rec->switch_output.enabled)
> rec->timestamp_filename = true;
>
> if (!rec->itr) {
> @@ -1653,7 +1693,7 @@ int cmd_record(int argc, const char **argv, const char *prefix __maybe_unused)
>
> if (rec->no_buildid_cache || rec->no_buildid) {
> disable_buildid_cache();
> - } else if (rec->switch_output.signal) {
> + } else if (rec->switch_output.enabled) {
> /*
> * In 'perf record --switch-output', disable buildid
> * generation by default to reduce data file switching
> @@ -1745,6 +1785,8 @@ int cmd_record(int argc, const char **argv, const char *prefix __maybe_unused)
>
> static void snapshot_sig_handler(int sig __maybe_unused)
> {
> + struct record *rec = &record;
> +
> if (trigger_is_ready(&auxtrace_snapshot_trigger)) {
> trigger_hit(&auxtrace_snapshot_trigger);
> auxtrace_record__snapshot_started = 1;
> @@ -1752,6 +1794,6 @@ static void snapshot_sig_handler(int sig __maybe_unused)
> trigger_error(&auxtrace_snapshot_trigger);
> }
>
> - if (trigger_is_ready(&switch_output_trigger))
> + if (switch_output_signal(rec))
> trigger_hit(&switch_output_trigger);
> }
> --
> 2.7.4
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