From 21ef97f05a7da5bc23b26cb34d6746f83ca9bf20 Mon Sep 17 00:00:00 2001 From: Ian Munsie Date: Fri, 10 Dec 2010 14:09:16 +1100 Subject: [PATCH] perf session: Fallback to unordered processing if no sample_id_all If we are running the new perf on an old kernel without support for sample_id_all, we should fall back to the old unordered processing of events. If we didn't than we would *always* process events without timestamps out of order, whether or not we hit a reordering race. In other words, instead of there being a chance of not attributing samples correctly, we would guarantee that samples would not be attributed. While processing all events without timestamps before events with timestamps may seem like an intuitive solution, it falls down as PERF_RECORD_EXIT events would also be processed before any samples. Even with a workaround for that case, samples before/after an exec would not be attributed correctly. This patch allows commands to indicate whether they need to fall back to unordered processing, so that commands that do not care about timestamps on every event will not be affected. If we do fallback, this will print out a warning if report -D was invoked. This patch adds the test in perf_session__new so that we only need to test once per session. Commands that do not use an event_ops (such as record and top) can simply pass NULL in it's place. Acked-by: Thomas Gleixner Cc: Frederic Weisbecker Cc: Ingo Molnar Cc: Peter Zijlstra Cc: Thomas Gleixner LKML-Reference: <1291951882-sup-6069@au1.ibm.com> Signed-off-by: Ian Munsie Signed-off-by: Arnaldo Carvalho de Melo --- tools/perf/builtin-annotate.c | 2 +- tools/perf/builtin-buildid-list.c | 3 ++- tools/perf/builtin-diff.c | 4 ++-- tools/perf/builtin-inject.c | 2 +- tools/perf/builtin-kmem.c | 3 ++- tools/perf/builtin-lock.c | 2 +- tools/perf/builtin-record.c | 2 +- tools/perf/builtin-report.c | 2 +- tools/perf/builtin-sched.c | 3 ++- tools/perf/builtin-script.c | 2 +- tools/perf/builtin-timechart.c | 3 ++- tools/perf/builtin-top.c | 2 +- tools/perf/util/session.c | 11 ++++++++++- tools/perf/util/session.h | 5 ++++- 14 files changed, 31 insertions(+), 15 deletions(-) diff --git a/tools/perf/builtin-annotate.c b/tools/perf/builtin-annotate.c index 569a2761b90ac..48dbab4b482f7 100644 --- a/tools/perf/builtin-annotate.c +++ b/tools/perf/builtin-annotate.c @@ -382,7 +382,7 @@ static int __cmd_annotate(void) int ret; struct perf_session *session; - session = perf_session__new(input_name, O_RDONLY, force, false); + session = perf_session__new(input_name, O_RDONLY, force, false, &event_ops); if (session == NULL) return -ENOMEM; diff --git a/tools/perf/builtin-buildid-list.c b/tools/perf/builtin-buildid-list.c index 44a47e13bd673..3b06f9ca26381 100644 --- a/tools/perf/builtin-buildid-list.c +++ b/tools/perf/builtin-buildid-list.c @@ -39,7 +39,8 @@ static int __cmd_buildid_list(void) int err = -1; struct perf_session *session; - session = perf_session__new(input_name, O_RDONLY, force, false); + session = perf_session__new(input_name, O_RDONLY, force, false, + &build_id__mark_dso_hit_ops); if (session == NULL) return -1; diff --git a/tools/perf/builtin-diff.c b/tools/perf/builtin-diff.c index 5e1a043aae038..af84e1c0519d7 100644 --- a/tools/perf/builtin-diff.c +++ b/tools/perf/builtin-diff.c @@ -142,8 +142,8 @@ static int __cmd_diff(void) int ret, i; struct perf_session *session[2]; - session[0] = perf_session__new(input_old, O_RDONLY, force, false); - session[1] = perf_session__new(input_new, O_RDONLY, force, false); + session[0] = perf_session__new(input_old, O_RDONLY, force, false, &event_ops); + session[1] = perf_session__new(input_new, O_RDONLY, force, false, &event_ops); if (session[0] == NULL || session[1] == NULL) return -ENOMEM; diff --git a/tools/perf/builtin-inject.c b/tools/perf/builtin-inject.c index 4b66b85794109..0c78ffa7bf675 100644 --- a/tools/perf/builtin-inject.c +++ b/tools/perf/builtin-inject.c @@ -196,7 +196,7 @@ static int __cmd_inject(void) inject_ops.tracing_data = event__repipe_tracing_data; } - session = perf_session__new(input_name, O_RDONLY, false, true); + session = perf_session__new(input_name, O_RDONLY, false, true, &inject_ops); if (session == NULL) return -ENOMEM; diff --git a/tools/perf/builtin-kmem.c b/tools/perf/builtin-kmem.c index c9620ff6496ff..def7ddc2fd4fb 100644 --- a/tools/perf/builtin-kmem.c +++ b/tools/perf/builtin-kmem.c @@ -481,7 +481,8 @@ static void sort_result(void) static int __cmd_kmem(void) { int err = -EINVAL; - struct perf_session *session = perf_session__new(input_name, O_RDONLY, 0, false); + struct perf_session *session = perf_session__new(input_name, O_RDONLY, + 0, false, &event_ops); if (session == NULL) return -ENOMEM; diff --git a/tools/perf/builtin-lock.c b/tools/perf/builtin-lock.c index b41b4492b1cc4..b9c6e54329713 100644 --- a/tools/perf/builtin-lock.c +++ b/tools/perf/builtin-lock.c @@ -858,7 +858,7 @@ static struct perf_event_ops eops = { static int read_events(void) { - session = perf_session__new(input_name, O_RDONLY, 0, false); + session = perf_session__new(input_name, O_RDONLY, 0, false, &eops); if (!session) die("Initializing perf session failed\n"); diff --git a/tools/perf/builtin-record.c b/tools/perf/builtin-record.c index e9be6ae87a278..efd1b3c3d4a03 100644 --- a/tools/perf/builtin-record.c +++ b/tools/perf/builtin-record.c @@ -572,7 +572,7 @@ static int __cmd_record(int argc, const char **argv) } session = perf_session__new(output_name, O_WRONLY, - write_mode == WRITE_FORCE, false); + write_mode == WRITE_FORCE, false, NULL); if (session == NULL) { pr_err("Not enough memory for reading perf file header\n"); return -1; diff --git a/tools/perf/builtin-report.c b/tools/perf/builtin-report.c index b6a2a899aa8fb..fd4c4500cd15e 100644 --- a/tools/perf/builtin-report.c +++ b/tools/perf/builtin-report.c @@ -308,7 +308,7 @@ static int __cmd_report(void) signal(SIGINT, sig_handler); - session = perf_session__new(input_name, O_RDONLY, force, false); + session = perf_session__new(input_name, O_RDONLY, force, false, &event_ops); if (session == NULL) return -ENOMEM; diff --git a/tools/perf/builtin-sched.c b/tools/perf/builtin-sched.c index c7753940aea04..7a4ebeb8b016b 100644 --- a/tools/perf/builtin-sched.c +++ b/tools/perf/builtin-sched.c @@ -1643,7 +1643,8 @@ static struct perf_event_ops event_ops = { static int read_events(void) { int err = -EINVAL; - struct perf_session *session = perf_session__new(input_name, O_RDONLY, 0, false); + struct perf_session *session = perf_session__new(input_name, O_RDONLY, + 0, false, &event_ops); if (session == NULL) return -ENOMEM; diff --git a/tools/perf/builtin-script.c b/tools/perf/builtin-script.c index 54f1ea808db53..6ef65c04ab9a2 100644 --- a/tools/perf/builtin-script.c +++ b/tools/perf/builtin-script.c @@ -779,7 +779,7 @@ int cmd_script(int argc, const char **argv, const char *prefix __used) if (!script_name) setup_pager(); - session = perf_session__new(input_name, O_RDONLY, 0, false); + session = perf_session__new(input_name, O_RDONLY, 0, false, &event_ops); if (session == NULL) return -ENOMEM; diff --git a/tools/perf/builtin-timechart.c b/tools/perf/builtin-timechart.c index d2fc46103f834..459b5e3db267a 100644 --- a/tools/perf/builtin-timechart.c +++ b/tools/perf/builtin-timechart.c @@ -937,7 +937,8 @@ static struct perf_event_ops event_ops = { static int __cmd_timechart(void) { - struct perf_session *session = perf_session__new(input_name, O_RDONLY, 0, false); + struct perf_session *session = perf_session__new(input_name, O_RDONLY, + 0, false, &event_ops); int ret = -EINVAL; if (session == NULL) diff --git a/tools/perf/builtin-top.c b/tools/perf/builtin-top.c index 0515ce9d3d3ea..ae15f046c4058 100644 --- a/tools/perf/builtin-top.c +++ b/tools/perf/builtin-top.c @@ -1272,7 +1272,7 @@ static int __cmd_top(void) * FIXME: perf_session__new should allow passing a O_MMAP, so that all this * mmap reading, etc is encapsulated in it. Use O_WRONLY for now. */ - struct perf_session *session = perf_session__new(NULL, O_WRONLY, false, false); + struct perf_session *session = perf_session__new(NULL, O_WRONLY, false, false, NULL); if (session == NULL) return -ENOMEM; diff --git a/tools/perf/util/session.c b/tools/perf/util/session.c index b59abf5aba36e..0f7e544544f56 100644 --- a/tools/perf/util/session.c +++ b/tools/perf/util/session.c @@ -125,7 +125,9 @@ static void perf_session__destroy_kernel_maps(struct perf_session *self) machines__destroy_guest_kernel_maps(&self->machines); } -struct perf_session *perf_session__new(const char *filename, int mode, bool force, bool repipe) +struct perf_session *perf_session__new(const char *filename, int mode, + bool force, bool repipe, + struct perf_event_ops *ops) { size_t len = filename ? strlen(filename) + 1 : 0; struct perf_session *self = zalloc(sizeof(*self) + len); @@ -170,6 +172,13 @@ struct perf_session *perf_session__new(const char *filename, int mode, bool forc } perf_session__update_sample_type(self); + + if (ops && ops->ordering_requires_timestamps && + ops->ordered_samples && !self->sample_id_all) { + dump_printf("WARNING: No sample_id_all support, falling back to unordered processing\n"); + ops->ordered_samples = false; + } + out: return self; out_free: diff --git a/tools/perf/util/session.h b/tools/perf/util/session.h index ac36f99f14af5..ffe4b98db8f08 100644 --- a/tools/perf/util/session.h +++ b/tools/perf/util/session.h @@ -78,9 +78,12 @@ struct perf_event_ops { build_id; event_op2 finished_round; bool ordered_samples; + bool ordering_requires_timestamps; }; -struct perf_session *perf_session__new(const char *filename, int mode, bool force, bool repipe); +struct perf_session *perf_session__new(const char *filename, int mode, + bool force, bool repipe, + struct perf_event_ops *ops); void perf_session__delete(struct perf_session *self); void perf_event_header__bswap(struct perf_event_header *self); -- 2.30.2