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perf hists: Check if a hist_entry has callchains before using them

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So far if we use 'perf record -g' this will make
symbol_conf.use_callchain 'true' and logic will assume that all events
have callchains enabled, but ever since we added the possibility of
setting up callchains for some events (e.g.: -e
cycles/call-graph=dwarf/) while not for others, we limit usage scenarios
by looking at that symbol_conf.use_callchain global boolean, we better
look at each event attributes.

On the road to that we need to look if a hist_entry has callchains, that
is, to go from hist_entry->hists to the evsel that contains it, to then
look at evsel->sample_type for PERF_SAMPLE_CALLCHAIN.

The next step is to add a symbol_conf.ignore_callchains global, to use
in the places where what we really want to know is if callchains should
be ignored, even if present.

Then -g will mean just to select a callchain mode to be applied to all
events not explicitely setting some other callchain mode, i.e. a default
callchain mode, and --no-call-graph will set
symbol_conf.ignore_callchains with that clear intention.

That too will at some point become a per evsel thing, that tools can set
for all or just a few of its evsels.

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: https://lkml.kernel.org/n/tip-0sas5cm4dsw2obn75g7ruz69@git.kernel.org
Signed-off-by: Arnaldo Carvalho de Melo <acme@redhat.com>
This commit is contained in:
Arnaldo Carvalho de Melo
2018-05-29 13:59:24 -03:00
parent 0b5d6ece5e
commit fabd37b837
7 changed files with 25 additions and 17 deletions
Download Patch File Download Diff File Expand all files Collapse all files

11
tools/perf/ui/browsers/hists.c
View File

@@ -1231,6 +1231,7 @@ static int hist_browser__show_entry(struct hist_browser *browser,
int width = browser->b.width;
char folded_sign = ' ';
bool current_entry = ui_browser__is_current_entry(&browser->b, row);
bool use_callchain = hist_entry__has_callchains(entry) && symbol_conf.use_callchain;
off_t row_offset = entry->row_offset;
bool first = true;
struct perf_hpp_fmt *fmt;
@@ -1240,7 +1241,7 @@ static int hist_browser__show_entry(struct hist_browser *browser,
browser->selection = &entry->ms;
}
if (symbol_conf.use_callchain) {
if (use_callchain) {
hist_entry__init_have_children(entry);
folded_sign = hist_entry__folded(entry);
}
@@ -1276,7 +1277,7 @@ static int hist_browser__show_entry(struct hist_browser *browser,
}
if (first) {
if (symbol_conf.use_callchain) {
if (use_callchain) {
ui_browser__printf(&browser->b, "%c ", folded_sign);
width -= 2;
}
@@ -1583,7 +1584,7 @@ hists_browser__scnprintf_headers(struct hist_browser *browser, char *buf,
int column = 0;
int span = 0;
if (symbol_conf.use_callchain) {
if (hists__has_callchains(hists) && symbol_conf.use_callchain) {
ret = scnprintf(buf, size, " ");
if (advance_hpp_check(&dummy_hpp, ret))
return ret;
@@ -1987,7 +1988,7 @@ static int hist_browser__fprintf_entry(struct hist_browser *browser,
bool first = true;
int ret;
if (symbol_conf.use_callchain) {
if (hist_entry__has_callchains(he) && symbol_conf.use_callchain) {
folded_sign = hist_entry__folded(he);
printed += fprintf(fp, "%c ", folded_sign);
}
@@ -2671,7 +2672,7 @@ static void hist_browser__update_percent_limit(struct hist_browser *hb,
he->nr_rows = 0;
}
if (!he->leaf || !symbol_conf.use_callchain)
if (!he->leaf || !hist_entry__has_callchains(he) || !symbol_conf.use_callchain)
goto next;
if (callchain_param.mode == CHAIN_GRAPH_REL) {

5
tools/perf/ui/gtk/hists.c
View File

@@ -382,7 +382,8 @@ static void perf_gtk__show_hists(GtkWidget *window, struct hists *hists,
gtk_tree_store_set(store, &iter, col_idx++, s, -1);
}
if (symbol_conf.use_callchain && hists__has(hists, sym)) {
if (hists__has_callchains(hists) &&
symbol_conf.use_callchain && hists__has(hists, sym)) {
if (callchain_param.mode == CHAIN_GRAPH_REL)
total = symbol_conf.cumulate_callchain ?
h->stat_acc->period : h->stat.period;
@@ -479,7 +480,7 @@ static void perf_gtk__add_hierarchy_entries(struct hists *hists,
}
}
if (symbol_conf.use_callchain && he->leaf) {
if (he->leaf && hist_entry__has_callchains(he) && symbol_conf.use_callchain) {
if (callchain_param.mode == CHAIN_GRAPH_REL)
total = symbol_conf.cumulate_callchain ?
he->stat_acc->period : he->stat.period;

2
tools/perf/ui/hist.c
View File

@@ -207,7 +207,7 @@ static int __hpp__sort_acc(struct hist_entry *a, struct hist_entry *b,
if (ret)
return ret;
if (a->thread != b->thread || !symbol_conf.use_callchain)
if (a->thread != b->thread || !hist_entry__has_callchains(a) || !symbol_conf.use_callchain)
return 0;
ret = b->callchain->max_depth - a->callchain->max_depth;

4
tools/perf/ui/stdio/hist.c
View File

@@ -516,7 +516,7 @@ static int hist_entry__hierarchy_fprintf(struct hist_entry *he,
}
printed += putc('\n', fp);
if (symbol_conf.use_callchain && he->leaf) {
if (he->leaf && hist_entry__has_callchains(he) && symbol_conf.use_callchain) {
u64 total = hists__total_period(hists);
printed += hist_entry_callchain__fprintf(he, total, 0, fp);
@@ -550,7 +550,7 @@ static int hist_entry__fprintf(struct hist_entry *he, size_t size,
ret = fprintf(fp, "%s\n", bf);
if (use_callchain)
if (hist_entry__has_callchains(he) && use_callchain)
callchain_ret = hist_entry_callchain__fprintf(he, total_period,
0, fp);