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perf data: Enable stream flush within processing

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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 <dsahern@gmail.com>
Signed-off-by: Jiri Olsa <jolsa@kernel.org>
Acked-by: Namhyung Kim <namhyung@kernel.org>
Cc: David Ahern <dsahern@gmail.com>
Cc: Frederic Weisbecker <fweisbec@gmail.com>
Cc: He Kuang <hekuang@huawei.com>
Cc: Jeremie Galarneau <jgalar@efficios.com>
Cc: Paul Mackerras <paulus@samba.org>
Cc: Peter Zijlstra <a.p.zijlstra@chello.nl>
Cc: Sebastian Andrzej Siewior <bigeasy@linutronix.de>
Cc: Tom Zanussi <tzanussi@gmail.com>
Cc: Wang Nan <wangnan0@huawei.com>
Link: http://lkml.kernel.org/r/1429372220-6406-4-git-send-email-jolsa@kernel.org
Signed-off-by: Arnaldo Carvalho de Melo <acme@redhat.com>
This commit is contained in:
Jiri Olsa 2015-04-18 17:50:16 +02:00 committed by Arnaldo Carvalho de Melo
parent 90e129ff60
commit 89e5fa884d
1 changed files with 24 additions and 2 deletions
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26
tools/perf/util/data-convert-bt.c
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@ -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;