From: Jiri Olsa <[email protected]> For big data files the size of data allocated for stream instance could get really high. It's needed to flush the data out of the stream once in a while.
Unfortunately there's no size indication in the stream object, so we govern the flush based on the number of stored events. Current flush limit is set ot 100000 events. Reviewed-by: David Ahern <[email protected]> Signed-off-by: Jiri Olsa <[email protected]> Acked-by: Namhyung Kim <[email protected]> Cc: David Ahern <[email protected]> Cc: Frederic Weisbecker <[email protected]> Cc: He Kuang <[email protected]> Cc: Jeremie Galarneau <[email protected]> Cc: Paul Mackerras <[email protected]> Cc: Peter Zijlstra <[email protected]> Cc: Sebastian Andrzej Siewior <[email protected]> Cc: Tom Zanussi <[email protected]> Cc: Wang Nan <[email protected]> Link: http://lkml.kernel.org/r/[email protected] Signed-off-by: Arnaldo Carvalho de Melo <[email protected]> --- tools/perf/util/data-convert-bt.c | 26 ++++++++++++++++++++++++-- 1 file changed, 24 insertions(+), 2 deletions(-) diff --git a/tools/perf/util/data-convert-bt.c b/tools/perf/util/data-convert-bt.c index 0a2d7a5b70f9..4f942b37067b 100644 --- a/tools/perf/util/data-convert-bt.c +++ b/tools/perf/util/data-convert-bt.c @@ -43,6 +43,7 @@ struct evsel_priv { struct ctf_stream { struct bt_ctf_stream *stream; int cpu; + u32 count; }; struct ctf_writer { @@ -392,7 +393,10 @@ static int ctf_stream__flush(struct ctf_stream *cs) if (err) pr_err("CTF stream %d flush failed\n", cs->cpu); - pr("Flush stream for cpu %d\n", cs->cpu); + pr("Flush stream for cpu %d (%u samples)\n", + cs->cpu, cs->count); + + cs->count = 0; } return err; @@ -490,6 +494,19 @@ static int get_sample_cpu(struct ctf_writer *cw, struct perf_sample *sample, return cpu; } +#define STREAM_FLUSH_COUNT 100000 + +/* + * Currently we have no other way to determine the + * time for the stream flush other than keep track + * of the number of events and check it against + * threshold. + */ +static bool is_flush_needed(struct ctf_stream *cs) +{ + return cs->count >= STREAM_FLUSH_COUNT; +} + static int process_sample_event(struct perf_tool *tool, union perf_event *_event __maybe_unused, struct perf_sample *sample, @@ -535,8 +552,13 @@ static int process_sample_event(struct perf_tool *tool, } cs = ctf_stream(cw, get_sample_cpu(cw, sample, evsel)); - if (cs) + if (cs) { + if (is_flush_needed(cs)) + ctf_stream__flush(cs); + + cs->count++; bt_ctf_stream_append_event(cs->stream, event); + } bt_ctf_event_put(event); return cs ? 0 : -1; -- 1.9.3 -- To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to [email protected] More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/
