perf hist: Introduce hists class and move lots of methods to it
In cbbc79a we introduced support for multiple events by introducing a
new "event_stat_id" struct and then made several perf_session methods
receive a point to it instead of a pointer to perf_session, and kept the
event_stats and hists rb_tree in perf_session.
While working on the new newt based browser, I realised that it would be
better to introduce a new class, "hists" (short for "histograms"),
renaming the "event_stat_id" struct and the perf_session methods that
were really "hists" methods, as they manipulate only struct hists
members, not touching anything in the other perf_session members.
Other optimizations, such as calculating the maximum lenght of a symbol
name present in an hists instance will be possible as we add them,
avoiding a re-traversal just for finding that information.
The rationale for the name "hists" to replace "event_stat_id" is that we
may have multiple sets of hists for the same event_stat id, as, for
instance, the 'perf diff' tool has, so event stat id is not what
characterizes what this struct and the functions that manipulate it do.
Cc: Eric B Munson <ebmunson@us.ibm.com>
Cc: Frédéric Weisbecker <fweisbec@gmail.com>
Cc: Mike Galbraith <efault@gmx.de>
Cc: Paul Mackerras <paulus@samba.org>
Cc: Peter Zijlstra <a.p.zijlstra@chello.nl>
Cc: Tom Zanussi <tzanussi@gmail.com>
LKML-Reference: <new-submission>
Signed-off-by: Arnaldo Carvalho de Melo <acme@redhat.com>
diff --git a/tools/perf/builtin-report.c b/tools/perf/builtin-report.c
index 642a6d8..53077fd 100644
--- a/tools/perf/builtin-report.c
+++ b/tools/perf/builtin-report.c
@@ -44,16 +44,17 @@
static char callchain_default_opt[] = "fractal,0.5";
-static struct event_stat_id *get_stats(struct perf_session *self,
- u64 event_stream, u32 type, u64 config)
+static struct hists *perf_session__hists_findnew(struct perf_session *self,
+ u64 event_stream, u32 type,
+ u64 config)
{
- struct rb_node **p = &self->stats_by_id.rb_node;
+ struct rb_node **p = &self->hists_tree.rb_node;
struct rb_node *parent = NULL;
- struct event_stat_id *iter, *new;
+ struct hists *iter, *new;
while (*p != NULL) {
parent = *p;
- iter = rb_entry(parent, struct event_stat_id, rb_node);
+ iter = rb_entry(parent, struct hists, rb_node);
if (iter->config == config)
return iter;
@@ -64,15 +65,15 @@
p = &(*p)->rb_left;
}
- new = malloc(sizeof(struct event_stat_id));
+ new = malloc(sizeof(struct hists));
if (new == NULL)
return NULL;
- memset(new, 0, sizeof(struct event_stat_id));
+ memset(new, 0, sizeof(struct hists));
new->event_stream = event_stream;
new->config = config;
new->type = type;
rb_link_node(&new->rb_node, parent, p);
- rb_insert_color(&new->rb_node, &self->stats_by_id);
+ rb_insert_color(&new->rb_node, &self->hists_tree);
return new;
}
@@ -84,7 +85,7 @@
struct symbol *parent = NULL;
int err = -ENOMEM;
struct hist_entry *he;
- struct event_stat_id *stats;
+ struct hists *hists;
struct perf_event_attr *attr;
if ((sort__has_parent || symbol_conf.use_callchain) && data->callchain) {
@@ -96,13 +97,12 @@
attr = perf_header__find_attr(data->id, &self->header);
if (attr)
- stats = get_stats(self, data->id, attr->type, attr->config);
+ hists = perf_session__hists_findnew(self, data->id, attr->type, attr->config);
else
- stats = get_stats(self, data->id, 0, 0);
- if (stats == NULL)
+ hists = perf_session__hists_findnew(self, data->id, 0, 0);
+ if (hists == NULL)
goto out_free_syms;
- he = __perf_session__add_hist_entry(&stats->hists, al, parent,
- data->period);
+ he = __hists__add_entry(hists, al, parent, data->period);
if (he == NULL)
goto out_free_syms;
err = 0;
@@ -117,18 +117,19 @@
struct sample_data *data,
struct perf_event_attr *attr)
{
- struct event_stat_id *stats;
+ struct hists *hists;
if (attr)
- stats = get_stats(session, data->id, attr->type, attr->config);
+ hists = perf_session__hists_findnew(session, data->id,
+ attr->type, attr->config);
else
- stats = get_stats(session, data->id, 0, 0);
+ hists = perf_session__hists_findnew(session, data->id, 0, 0);
- if (!stats)
+ if (!hists)
return -ENOMEM;
- stats->stats.total += data->period;
- session->events_stats.total += data->period;
+ hists->stats.total += data->period;
+ session->hists.stats.total += data->period;
return 0;
}
@@ -292,35 +293,33 @@
if (verbose > 2)
perf_session__fprintf_dsos(session, stdout);
- next = rb_first(&session->stats_by_id);
+ next = rb_first(&session->hists_tree);
while (next) {
- struct event_stat_id *stats;
+ struct hists *hists;
u64 nr_hists;
- stats = rb_entry(next, struct event_stat_id, rb_node);
- perf_session__collapse_resort(&stats->hists);
- nr_hists = perf_session__output_resort(&stats->hists,
- stats->stats.total);
+ hists = rb_entry(next, struct hists, rb_node);
+ hists__collapse_resort(hists);
+ nr_hists = hists__output_resort(hists);
if (use_browser)
- perf_session__browse_hists(&stats->hists, nr_hists,
- stats->stats.total, help,
+ perf_session__browse_hists(&hists->entries, nr_hists,
+ hists->stats.total, help,
input_name);
else {
- if (rb_first(&session->stats_by_id) ==
- rb_last(&session->stats_by_id))
+ if (rb_first(&session->hists.entries) ==
+ rb_last(&session->hists.entries))
fprintf(stdout, "# Samples: %Ld\n#\n",
- stats->stats.total);
+ hists->stats.total);
else
fprintf(stdout, "# Samples: %Ld %s\n#\n",
- stats->stats.total,
- __event_name(stats->type, stats->config));
+ hists->stats.total,
+ __event_name(hists->type, hists->config));
- perf_session__fprintf_hists(&stats->hists, NULL, false, stdout,
- stats->stats.total);
+ hists__fprintf(hists, NULL, false, stdout);
fprintf(stdout, "\n\n");
}
- next = rb_next(&stats->rb_node);
+ next = rb_next(&hists->rb_node);
}
if (!use_browser && sort_order == default_sort_order &&