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Commit 4bf9ce1b authored by Jiri Olsa's avatar Jiri Olsa Committed by Arnaldo Carvalho de Melo
Browse files

perf diff: Fix to work with new hists design 



The perf diff command is broken since:
  perf hists: Threaded addition and sorting of entries
  commit 1980c2eb

Several places were broken:
  - hists data need to be collected into opened sessions instead
    of into events
  - session's hists data need to be initialized properly when the
    session is created
  - hist_entry__pcnt_snprintf: the percentage and displacement
    buffer preparation must not use 'ret' because it's used
    as a pointer to the final buffer

Signed-off-by: default avatarJiri Olsa <jolsa@redhat.com>
Cc: Corey Ashford <cjashfor@linux.vnet.ibm.com>
Cc: Frederic Weisbecker <fweisbec@gmail.com>
Cc: Ingo Molnar <mingo@elte.hu>
Cc: Paul Mackerras <paulus@samba.org>
Cc: Peter Zijlstra <a.p.zijlstra@chello.nl>
Link: http://lkml.kernel.org/r/20120322133726.GB1601@m.brq.redhat.com


Signed-off-by: default avatarArnaldo Carvalho de Melo <acme@redhat.com>
parent 5d7be90e

tools/perf/builtin-diff.c

+35 −25
Original line number Diff line number Diff line
@@ -24,6 +24,11 @@ static char diff__default_sort_order[] = "dso,symbol"; 
static bool  force;

static bool show_displacement;



struct perf_diff {

	struct perf_tool tool;

	struct perf_session *session;

};



static int hists__add_entry(struct hists *self,

			    struct addr_location *al, u64 period)

{
@@ -32,12 +37,14 @@ static int hists__add_entry(struct hists *self, 
	return -ENOMEM;

}



static int diff__process_sample_event(struct perf_tool *tool __used,

static int diff__process_sample_event(struct perf_tool *tool,

				      union perf_event *event,

				      struct perf_sample *sample,

				      struct perf_evsel *evsel __used,

				      struct machine *machine)

{

	struct perf_diff *_diff = container_of(tool, struct perf_diff, tool);

	struct perf_session *session = _diff->session;

	struct addr_location al;



	if (perf_event__preprocess_sample(event, machine, &al, sample, NULL) < 0) {
@@ -49,16 +56,17 @@ static int diff__process_sample_event(struct perf_tool *tool __used, 
	if (al.filtered || al.sym == NULL)

		return 0;



	if (hists__add_entry(&evsel->hists, &al, sample->period)) {

	if (hists__add_entry(&session->hists, &al, sample->period)) {

		pr_warning("problem incrementing symbol period, skipping event\n");

		return -1;

	}



	evsel->hists.stats.total_period += sample->period;

	session->hists.stats.total_period += sample->period;

	return 0;

}



static struct perf_tool perf_diff = {

static struct perf_diff diff = {

	.tool = {

		.sample	= diff__process_sample_event,

		.mmap	= perf_event__process_mmap,

		.comm	= perf_event__process_comm,
@@ -67,6 +75,7 @@ static struct perf_tool perf_diff = { 
		.lost	= perf_event__process_lost,

		.ordered_samples = true,

		.ordering_requires_timestamps = true,

	},

};



static void perf_session__insert_hist_entry_by_name(struct rb_root *root,
@@ -107,12 +116,6 @@ static void hists__resort_entries(struct hists *self) 
	self->entries = tmp;

}



static void hists__set_positions(struct hists *self)

{

	hists__output_resort(self);

	hists__resort_entries(self);

}



static struct hist_entry *hists__find_entry(struct hists *self,

					    struct hist_entry *he)

{
@@ -146,30 +149,37 @@ static void hists__match(struct hists *older, struct hists *newer) 
static int __cmd_diff(void)

{

	int ret, i;

#define older (session[0])

#define newer (session[1])

	struct perf_session *session[2];



	session[0] = perf_session__new(input_old, O_RDONLY, force, false, &perf_diff);

	session[1] = perf_session__new(input_new, O_RDONLY, force, false, &perf_diff);

	older = perf_session__new(input_old, O_RDONLY, force, false,

				  &diff.tool);

	newer = perf_session__new(input_new, O_RDONLY, force, false,

				  &diff.tool);

	if (session[0] == NULL || session[1] == NULL)

		return -ENOMEM;



	for (i = 0; i < 2; ++i) {

		ret = perf_session__process_events(session[i], &perf_diff);

		diff.session = session[i];

		ret = perf_session__process_events(session[i], &diff.tool);

		if (ret)

			goto out_delete;

		hists__output_resort(&session[i]->hists);

	}



	hists__output_resort(&session[1]->hists);

	if (show_displacement)

		hists__set_positions(&session[0]->hists);

		hists__resort_entries(&older->hists);



	hists__match(&session[0]->hists, &session[1]->hists);

	hists__fprintf(&session[1]->hists, &session[0]->hists,

	hists__match(&older->hists, &newer->hists);

	hists__fprintf(&newer->hists, &older->hists,

		       show_displacement, true, 0, 0, stdout);

out_delete:

	for (i = 0; i < 2; ++i)

		perf_session__delete(session[i]);

	return ret;

#undef older

#undef newer

}



static const char * const diff_usage[] = {

tools/perf/util/evsel.c

+1 −1
Original line number Diff line number Diff line
@@ -34,7 +34,7 @@ int __perf_evsel__sample_size(u64 sample_type) 
	return size;

}



static void hists__init(struct hists *hists)

void hists__init(struct hists *hists)

{

	memset(hists, 0, sizeof(*hists));

	hists->entries_in_array[0] = hists->entries_in_array[1] = RB_ROOT;

tools/perf/util/evsel.h

+2 −0
Original line number Diff line number Diff line
@@ -170,4 +170,6 @@ static inline int perf_evsel__sample_size(struct perf_evsel *evsel) 
	return __perf_evsel__sample_size(evsel->attr.sample_type);

}



void hists__init(struct hists *hists);



#endif /* __PERF_EVSEL_H */

tools/perf/util/hist.c

+4 −4
Original line number Diff line number Diff line
@@ -891,9 +891,9 @@ static int hist_entry__pcnt_snprintf(struct hist_entry *he, char *s, 
		diff = new_percent - old_percent;



		if (fabs(diff) >= 0.01)

			ret += scnprintf(bf, sizeof(bf), "%+4.2F%%", diff);

			scnprintf(bf, sizeof(bf), "%+4.2F%%", diff);

		else

			ret += scnprintf(bf, sizeof(bf), " ");

			scnprintf(bf, sizeof(bf), " ");



		if (sep)

			ret += scnprintf(s + ret, size - ret, "%c%s", *sep, bf);
@@ -902,9 +902,9 @@ static int hist_entry__pcnt_snprintf(struct hist_entry *he, char *s, 


		if (show_displacement) {

			if (displacement)

				ret += scnprintf(bf, sizeof(bf), "%+4ld", displacement);

				scnprintf(bf, sizeof(bf), "%+4ld", displacement);

			else

				ret += scnprintf(bf, sizeof(bf), " ");

				scnprintf(bf, sizeof(bf), " ");



			if (sep)

				ret += scnprintf(s + ret, size - ret, "%c%s", *sep, bf);

tools/perf/util/session.c

+1 −0
Original line number Diff line number Diff line
@@ -140,6 +140,7 @@ struct perf_session *perf_session__new(const char *filename, int mode, 
	INIT_LIST_HEAD(&self->ordered_samples.sample_cache);

	INIT_LIST_HEAD(&self->ordered_samples.to_free);

	machine__init(&self->host_machine, "", HOST_KERNEL_ID);

	hists__init(&self->hists);



	if (mode == O_RDONLY) {

		if (perf_session__open(self, force) < 0)