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author | Jiri Olsa <jolsa@kernel.org> | 2017-08-03 13:21:14 +0200 |
---|---|---|
committer | Arnaldo Carvalho de Melo <acme@redhat.com> | 2017-11-17 16:16:04 +0100 |
commit | 93d10af26bb7159349158b721ba2e258291d53c3 (patch) | |
tree | e476300cb6e6f32e23e79c453bf259b036829cd3 /tools/perf | |
parent | perf ordered_events: Pass timestamp arg in perf_session__queue_event (diff) | |
download | linux-93d10af26bb7159349158b721ba2e258291d53c3.tar.xz linux-93d10af26bb7159349158b721ba2e258291d53c3.zip |
perf tools: Optimize sample parsing for ordered events
Currently when using ordered events we parse the sample twice (the
perf_evlist__parse_sample function). Once before we queue the sample for
sorting:
perf_session__process_event
perf_evlist__parse_sample(sample)
perf_session__queue_event(sample.time)
And then when we deliver the sorted sample:
ordered_events__deliver_event
perf_evlist__parse_sample
perf_session__deliver_event
We can skip the initial full sample parsing by using
perf_evlist__parse_sample_timestamp function, which got introduced
earlier. The new path looks like:
perf_session__process_event
perf_evlist__parse_sample_timestamp
perf_session__queue_event
ordered_events__deliver_event
perf_session__deliver_event
perf_evlist__parse_sample
It saves some instructions and is slightly faster:
Before:
Performance counter stats for './perf.old report --stdio' (5 runs):
64,396,007,225 cycles:u ( +- 0.97% )
105,882,112,735 instructions:u # 1.64 insn per cycle ( +- 0.00% )
21.618103465 seconds time elapsed ( +- 1.12% )
After:
Performance counter stats for './perf report --stdio' (5 runs):
60,567,807,182 cycles:u ( +- 0.40% )
104,853,333,514 instructions:u # 1.73 insn per cycle ( +- 0.00% )
20.168895243 seconds time elapsed ( +- 0.32% )
Signed-off-by: Jiri Olsa <jolsa@kernel.org>
Cc: Adrian Hunter <adrian.hunter@intel.com>
Cc: David Ahern <dsahern@gmail.com>
Cc: Jiri Olsa <jolsa@kernel.org>
Cc: Namhyung Kim <namhyung@kernel.org>
Cc: Wang Nan <wangnan0@huawei.com>
Link: http://lkml.kernel.org/n/tip-cjp2tuk0qkjs9dxzlpmm34ua@git.kernel.org
Signed-off-by: Arnaldo Carvalho de Melo <acme@redhat.com>
Diffstat (limited to 'tools/perf')
-rw-r--r-- | tools/perf/builtin-kvm.c | 8 | ||||
-rw-r--r-- | tools/perf/util/session.c | 41 |
2 files changed, 22 insertions, 27 deletions
diff --git a/tools/perf/builtin-kvm.c b/tools/perf/builtin-kvm.c index cd253db6917f..597c7de9bec9 100644 --- a/tools/perf/builtin-kvm.c +++ b/tools/perf/builtin-kvm.c @@ -741,20 +741,20 @@ static s64 perf_kvm__mmap_read_idx(struct perf_kvm_stat *kvm, int idx, u64 *mmap_time) { union perf_event *event; - struct perf_sample sample; + u64 timestamp; s64 n = 0; int err; *mmap_time = ULLONG_MAX; while ((event = perf_evlist__mmap_read(kvm->evlist, idx)) != NULL) { - err = perf_evlist__parse_sample(kvm->evlist, event, &sample); + err = perf_evlist__parse_sample_timestamp(kvm->evlist, event, ×tamp); if (err) { perf_evlist__mmap_consume(kvm->evlist, idx); pr_err("Failed to parse sample\n"); return -1; } - err = perf_session__queue_event(kvm->session, event, sample.time, 0); + err = perf_session__queue_event(kvm->session, event, timestamp, 0); /* * FIXME: Here we can't consume the event, as perf_session__queue_event will * point to it, and it'll get possibly overwritten by the kernel. @@ -768,7 +768,7 @@ static s64 perf_kvm__mmap_read_idx(struct perf_kvm_stat *kvm, int idx, /* save time stamp of our first sample for this mmap */ if (n == 0) - *mmap_time = sample.time; + *mmap_time = timestamp; /* limit events per mmap handled all at once */ n++; diff --git a/tools/perf/util/session.c b/tools/perf/util/session.c index 8976e417eab2..df2857137908 100644 --- a/tools/perf/util/session.c +++ b/tools/perf/util/session.c @@ -27,7 +27,6 @@ static int perf_session__deliver_event(struct perf_session *session, union perf_event *event, - struct perf_sample *sample, struct perf_tool *tool, u64 file_offset); @@ -107,17 +106,10 @@ static void perf_session__set_comm_exec(struct perf_session *session) static int ordered_events__deliver_event(struct ordered_events *oe, struct ordered_event *event) { - struct perf_sample sample; struct perf_session *session = container_of(oe, struct perf_session, ordered_events); - int ret = perf_evlist__parse_sample(session->evlist, event->event, &sample); - - if (ret) { - pr_err("Can't parse sample, err = %d\n", ret); - return ret; - } - return perf_session__deliver_event(session, event->event, &sample, + return perf_session__deliver_event(session, event->event, session->tool, event->file_offset); } @@ -1328,20 +1320,26 @@ static int machines__deliver_event(struct machines *machines, static int perf_session__deliver_event(struct perf_session *session, union perf_event *event, - struct perf_sample *sample, struct perf_tool *tool, u64 file_offset) { + struct perf_sample sample; int ret; - ret = auxtrace__process_event(session, event, sample, tool); + ret = perf_evlist__parse_sample(session->evlist, event, &sample); + if (ret) { + pr_err("Can't parse sample, err = %d\n", ret); + return ret; + } + + ret = auxtrace__process_event(session, event, &sample, tool); if (ret < 0) return ret; if (ret > 0) return 0; return machines__deliver_event(&session->machines, session->evlist, - event, sample, tool, file_offset); + event, &sample, tool, file_offset); } static s64 perf_session__process_user_event(struct perf_session *session, @@ -1495,7 +1493,6 @@ static s64 perf_session__process_event(struct perf_session *session, { struct perf_evlist *evlist = session->evlist; struct perf_tool *tool = session->tool; - struct perf_sample sample; int ret; if (session->header.needs_swap) @@ -1509,21 +1506,19 @@ static s64 perf_session__process_event(struct perf_session *session, if (event->header.type >= PERF_RECORD_USER_TYPE_START) return perf_session__process_user_event(session, event, file_offset); - /* - * For all kernel events we get the sample data - */ - ret = perf_evlist__parse_sample(evlist, event, &sample); - if (ret) - return ret; - if (tool->ordered_events) { - ret = perf_session__queue_event(session, event, sample.time, file_offset); + u64 timestamp; + + ret = perf_evlist__parse_sample_timestamp(evlist, event, ×tamp); + if (ret) + return ret; + + ret = perf_session__queue_event(session, event, timestamp, file_offset); if (ret != -ETIME) return ret; } - return perf_session__deliver_event(session, event, &sample, tool, - file_offset); + return perf_session__deliver_event(session, event, tool, file_offset); } void perf_event_header__bswap(struct perf_event_header *hdr) |