[PATCH 2/4] perf hist: Clarify events_stats fields usage
From: Arnaldo Carvalho de Melo
Date: Fri May 14 2010 - 19:09:57 EST
From: Arnaldo Carvalho de Melo <acme@xxxxxxxxxx>
The events_stats.total field is too generic, rename it to .total_period,
and also add a comment explaining that it is the sum of all the .period
fields in samples, that is needed because we use auto-freq to avoid
sampling artifacts.
Ditto for events_stats.lost, that is the sum of all lost_event.lost
fields, i.e. the number of events the kernel dropped.
Looking at the users, builtin-sched.c can make use of these fields and
stop doing it again.
Cc: FrÃdÃric Weisbecker <fweisbec@xxxxxxxxx>
Cc: Mike Galbraith <efault@xxxxxx>
Cc: Paul Mackerras <paulus@xxxxxxxxx>
Cc: Peter Zijlstra <a.p.zijlstra@xxxxxxxxx>
Cc: Tom Zanussi <tzanussi@xxxxxxxxx>
LKML-Reference: <new-submission>
Signed-off-by: Arnaldo Carvalho de Melo <acme@xxxxxxxxxx>
---
tools/perf/builtin-diff.c | 2 +-
tools/perf/builtin-report.c | 8 ++++----
tools/perf/builtin-sched.c | 17 ++++++-----------
tools/perf/builtin-trace.c | 2 +-
tools/perf/util/event.c | 2 +-
tools/perf/util/hist.c | 20 ++++++++++----------
tools/perf/util/hist.h | 16 ++++++++++++++--
tools/perf/util/newt.c | 6 +++---
tools/perf/util/session.c | 2 +-
9 files changed, 41 insertions(+), 34 deletions(-)
diff --git a/tools/perf/builtin-diff.c b/tools/perf/builtin-diff.c
index 3a95a02..6dd4bda 100644
--- a/tools/perf/builtin-diff.c
+++ b/tools/perf/builtin-diff.c
@@ -54,7 +54,7 @@ static int diff__process_sample_event(event_t *event, struct perf_session *sessi
return -1;
}
- session->hists.stats.total += data.period;
+ session->hists.stats.total_period += data.period;
return 0;
}
diff --git a/tools/perf/builtin-report.c b/tools/perf/builtin-report.c
index f13cda1..b8f47de 100644
--- a/tools/perf/builtin-report.c
+++ b/tools/perf/builtin-report.c
@@ -138,14 +138,14 @@ static int add_event_total(struct perf_session *session,
if (!hists)
return -ENOMEM;
- hists->stats.total += data->period;
+ hists->stats.total_period += data->period;
/*
* FIXME: add_event_total should be moved from here to
* perf_session__process_event so that the proper hist is passed to
* the event_op methods.
*/
hists__inc_nr_events(hists, PERF_RECORD_SAMPLE);
- session->hists.stats.total += data->period;
+ session->hists.stats.total_period += data->period;
return 0;
}
@@ -322,10 +322,10 @@ static int __cmd_report(void)
if (rb_first(&session->hists.entries) ==
rb_last(&session->hists.entries))
fprintf(stdout, "# Samples: %Ld\n#\n",
- hists->stats.total);
+ hists->stats.total_period);
else
fprintf(stdout, "# Samples: %Ld %s\n#\n",
- hists->stats.total,
+ hists->stats.total_period,
__event_name(hists->type, hists->config));
hists__fprintf(hists, NULL, false, stdout);
diff --git a/tools/perf/builtin-sched.c b/tools/perf/builtin-sched.c
index aef6ed0..be7bc92 100644
--- a/tools/perf/builtin-sched.c
+++ b/tools/perf/builtin-sched.c
@@ -1641,19 +1641,10 @@ static int process_sample_event(event_t *event, struct perf_session *session)
return 0;
}
-static int process_lost_event(event_t *event __used,
- struct perf_session *session __used)
-{
- nr_lost_chunks++;
- nr_lost_events += event->lost.lost;
-
- return 0;
-}
-
static struct perf_event_ops event_ops = {
.sample = process_sample_event,
.comm = event__process_comm,
- .lost = process_lost_event,
+ .lost = event__process_lost,
.ordered_samples = true,
};
@@ -1664,8 +1655,12 @@ static int read_events(void)
if (session == NULL)
return -ENOMEM;
- if (perf_session__has_traces(session, "record -R"))
+ if (perf_session__has_traces(session, "record -R")) {
err = perf_session__process_events(session, &event_ops);
+ nr_events = session->hists.stats.nr_events[0];
+ nr_lost_events = session->hists.stats.total_lost;
+ nr_lost_chunks = session->hists.stats.nr_events[PERF_RECORD_LOST];
+ }
perf_session__delete(session);
return err;
diff --git a/tools/perf/builtin-trace.c b/tools/perf/builtin-trace.c
index 95fcb05..dddf3f0 100644
--- a/tools/perf/builtin-trace.c
+++ b/tools/perf/builtin-trace.c
@@ -109,7 +109,7 @@ static int process_sample_event(event_t *event, struct perf_session *session)
data.time, thread->comm);
}
- session->hists.stats.total += data.period;
+ session->hists.stats.total_period += data.period;
return 0;
}
diff --git a/tools/perf/util/event.c b/tools/perf/util/event.c
index 3e8fec1..50771b5 100644
--- a/tools/perf/util/event.c
+++ b/tools/perf/util/event.c
@@ -385,7 +385,7 @@ int event__process_comm(event_t *self, struct perf_session *session)
int event__process_lost(event_t *self, struct perf_session *session)
{
dump_printf(": id:%Ld: lost:%Ld\n", self->lost.id, self->lost.lost);
- session->hists.stats.lost += self->lost.lost;
+ session->hists.stats.total_lost += self->lost.lost;
return 0;
}
diff --git a/tools/perf/util/hist.c b/tools/perf/util/hist.c
index 1614ad7..c592245 100644
--- a/tools/perf/util/hist.c
+++ b/tools/perf/util/hist.c
@@ -239,7 +239,7 @@ void hists__output_resort(struct hists *self)
struct hist_entry *n;
u64 min_callchain_hits;
- min_callchain_hits = self->stats.total * (callchain_param.min_percent / 100);
+ min_callchain_hits = self->stats.total_period * (callchain_param.min_percent / 100);
tmp = RB_ROOT;
next = rb_first(&self->entries);
@@ -525,7 +525,7 @@ int hist_entry__snprintf(struct hist_entry *self, char *s, size_t size,
if (pair_hists) {
count = self->pair ? self->pair->count : 0;
- total = pair_hists->stats.total;
+ total = pair_hists->stats.total_period;
count_sys = self->pair ? self->pair->count_sys : 0;
count_us = self->pair ? self->pair->count_us : 0;
count_guest_sys = self->pair ? self->pair->count_guest_sys : 0;
@@ -769,10 +769,10 @@ print_entries:
++position;
}
ret += hist_entry__fprintf(h, pair, show_displacement,
- displacement, fp, self->stats.total);
+ displacement, fp, self->stats.total_period);
if (symbol_conf.use_callchain)
- ret += hist_entry__fprintf_callchain(h, fp, self->stats.total);
+ ret += hist_entry__fprintf_callchain(h, fp, self->stats.total_period);
if (h->ms.map == NULL && verbose > 1) {
__map_groups__fprintf_maps(&h->thread->mg,
@@ -795,7 +795,7 @@ void hists__filter_by_dso(struct hists *self, const struct dso *dso)
{
struct rb_node *nd;
- self->nr_entries = self->stats.total = 0;
+ self->nr_entries = self->stats.total_period = 0;
self->max_sym_namelen = 0;
for (nd = rb_first(&self->entries); nd; nd = rb_next(nd)) {
@@ -812,7 +812,7 @@ void hists__filter_by_dso(struct hists *self, const struct dso *dso)
h->filtered &= ~(1 << HIST_FILTER__DSO);
if (!h->filtered) {
++self->nr_entries;
- self->stats.total += h->count;
+ self->stats.total_period += h->count;
if (h->ms.sym &&
self->max_sym_namelen < h->ms.sym->namelen)
self->max_sym_namelen = h->ms.sym->namelen;
@@ -824,7 +824,7 @@ void hists__filter_by_thread(struct hists *self, const struct thread *thread)
{
struct rb_node *nd;
- self->nr_entries = self->stats.total = 0;
+ self->nr_entries = self->stats.total_period = 0;
self->max_sym_namelen = 0;
for (nd = rb_first(&self->entries); nd; nd = rb_next(nd)) {
@@ -837,7 +837,7 @@ void hists__filter_by_thread(struct hists *self, const struct thread *thread)
h->filtered &= ~(1 << HIST_FILTER__THREAD);
if (!h->filtered) {
++self->nr_entries;
- self->stats.total += h->count;
+ self->stats.total_period += h->count;
if (h->ms.sym &&
self->max_sym_namelen < h->ms.sym->namelen)
self->max_sym_namelen = h->ms.sym->namelen;
@@ -1031,8 +1031,8 @@ int hist_entry__annotate(struct hist_entry *self, struct list_head *head)
void hists__inc_nr_events(struct hists *self, u32 type)
{
- ++self->hists.stats.nr_events[0];
- ++self->hists.stats.nr_events[type];
+ ++self->stats.nr_events[0];
+ ++self->stats.nr_events[type];
}
size_t hists__fprintf_nr_events(struct hists *self, FILE *fp)
diff --git a/tools/perf/util/hist.h b/tools/perf/util/hist.h
index 97b8962..da6b848 100644
--- a/tools/perf/util/hist.h
+++ b/tools/perf/util/hist.h
@@ -37,9 +37,21 @@ struct sym_priv {
struct sym_ext *ext;
};
+/*
+ * The kernel collects the number of events it couldn't send in a stretch and
+ * when possible sends this number in a PERF_RECORD_LOST event. The number of
+ * such "chunks" of lost events is stored in .nr_events[PERF_EVENT_LOST] while
+ * total_lost tells exactly how many events the kernel in fact lost, i.e. it is
+ * the sum of all struct lost_event.lost fields reported.
+ *
+ * The total_period is needed because by default auto-freq is used, so
+ * multipling nr_events[PERF_EVENT_SAMPLE] by a frequency isn't possible to get
+ * the total number of low level events, it is necessary to to sum all struct
+ * sample_event.period and stash the result in total_period.
+ */
struct events_stats {
- u64 total;
- u64 lost;
+ u64 total_period;
+ u64 total_lost;
u32 nr_events[PERF_RECORD_HEADER_MAX];
u32 nr_unknown_events;
};
diff --git a/tools/perf/util/newt.c b/tools/perf/util/newt.c
index ba6acd0..010bacf 100644
--- a/tools/perf/util/newt.c
+++ b/tools/perf/util/newt.c
@@ -689,7 +689,7 @@ static int hist_browser__populate(struct hist_browser *self, struct hists *hists
}
snprintf(str, sizeof(str), "Samples: %Ld ",
- hists->stats.total);
+ hists->stats.total_period);
newtDrawRootText(0, 0, str);
newtGetScreenSize(NULL, &rows);
@@ -718,12 +718,12 @@ static int hist_browser__populate(struct hist_browser *self, struct hists *hists
if (h->filtered)
continue;
- len = hist_entry__append_browser(h, self->tree, hists->stats.total);
+ len = hist_entry__append_browser(h, self->tree, hists->stats.total_period);
if (len > max_len)
max_len = len;
if (symbol_conf.use_callchain)
hist_entry__append_callchain_browser(h, self->tree,
- hists->stats.total, idx++);
+ hists->stats.total_period, idx++);
++curr_hist;
if (curr_hist % 5)
ui_progress__update(progress, curr_hist);
diff --git a/tools/perf/util/session.c b/tools/perf/util/session.c
index 7231f6b..25bfca4 100644
--- a/tools/perf/util/session.c
+++ b/tools/perf/util/session.c
@@ -549,7 +549,7 @@ static int perf_session__process_event(struct perf_session *self,
dump_printf("%#Lx [%#x]: PERF_RECORD_%s",
offset + head, event->header.size,
event__name[event->header.type]);
- hists__inc_nr_events(self, event->header.type);
+ hists__inc_nr_events(&self->hists, event->header.type);
}
if (self->header.needs_swap && event__swap_ops[event->header.type])
--
1.6.2.5
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