Messages in this thread Patch in this message | | | From | Wang Nan <> | Subject | [PATCH 52/53] perf record: Toggle tailsize ring buffer for reading | Date | Mon, 11 Jan 2016 13:48:43 +0000 |
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Toggel tailsize_evt_stopped director after receiving done or switch output. After this patch it is possible to trigger a dump use SIGUSR2 when something happen.
Signed-off-by: Wang Nan <wangnan0@huawei.com> Signed-off-by: He Kuang <hekuang@huawei.com> Cc: Arnaldo Carvalho de Melo <acme@redhat.com> Cc: Jiri Olsa <jolsa@kernel.org> Cc: Masami Hiramatsu <masami.hiramatsu.pt@hitachi.com> Cc: Namhyung Kim <namhyung@kernel.org> Cc: Zefan Li <lizefan@huawei.com> Cc: pi3orama@163.com --- tools/perf/builtin-record.c | 36 ++++++++++++++++++++++++++++++++++++ 1 file changed, 36 insertions(+)
diff --git a/tools/perf/builtin-record.c b/tools/perf/builtin-record.c index 6c8905b..6ec0529 100644 --- a/tools/perf/builtin-record.c +++ b/tools/perf/builtin-record.c @@ -591,6 +591,26 @@ static void record__init_features(struct record *rec) } static void +record__toggle_tailsize_evsels(struct record *rec, bool stop) +{ + struct perf_evsel *pos; + struct perf_evlist *evlist = rec->evlist; + + evlist__for_each(evlist, pos) { + if (!pos->tailsize) + continue; + if (!pos->overwrite) + continue; + if (stop) + perf_evsel__disable(pos); + else + perf_evsel__enable(pos); + } + + rec->tailsize_evt_stopped = stop; +} + +static void record__finish_output(struct record *rec) { struct perf_data_file *file = &rec->file; @@ -925,6 +945,9 @@ static int __cmd_record(struct record *rec, int argc, const char **argv) for (;;) { unsigned long long hits = rec->samples; + if (switch_output_started || done) + record__toggle_tailsize_evsels(rec, true); + if (record__mmap_read_all(rec) < 0) { auxtrace_snapshot_disable(); err = -1; @@ -943,7 +966,20 @@ static int __cmd_record(struct record *rec, int argc, const char **argv) } if (switch_output_started) { + /* + * SIGUSR2 raise after or during record__mmap_read_all(). + * continue to read again. + */ + if (!rec->tailsize_evt_stopped) + continue; + switch_output_started = 0; + /* + * Reenable events in tailsize ring buffer after + * record__mmap_read_all(): we have collected + * data from it. + */ + record__toggle_tailsize_evsels(rec, false); if (!quiet) fprintf(stderr, "[ perf record: dump data: Woken up %ld times ]\n", -- 1.8.3.4
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