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

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>

7 files changed, 25 insertions, 17 deletions

diff --git a/tools/perf/ui/browsers/hists.c b/tools/perf/ui/browsers/hists.c
index 22054107f1af..a96f62ca984a 100644
--- a/tools/perf/ui/browsers/hists.c
+++ b/tools/perf/ui/browsers/hists.c
@@ -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) {
diff --git a/tools/perf/ui/gtk/hists.c b/tools/perf/ui/gtk/hists.c
index 24e1ec201ffd..b085f1b3e34d 100644
--- a/tools/perf/ui/gtk/hists.c
+++ b/tools/perf/ui/gtk/hists.c
@@ -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;
diff --git a/tools/perf/ui/hist.c b/tools/perf/ui/hist.c
index 706f6f1e9c7d..fe3dfaa64a91 100644
--- a/tools/perf/ui/hist.c
+++ b/tools/perf/ui/hist.c
@@ -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;
diff --git a/tools/perf/ui/stdio/hist.c b/tools/perf/ui/stdio/hist.c
index c1eb476da91b..69b7a28f7a1c 100644
--- a/tools/perf/ui/stdio/hist.c
+++ b/tools/perf/ui/stdio/hist.c
@@ -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);
 
diff --git a/tools/perf/util/hist.c b/tools/perf/util/hist.c
index 34864c87cd3c..52e8fda93a47 100644
--- a/tools/perf/util/hist.c
+++ b/tools/perf/util/hist.c
@@ -410,7 +410,7 @@ static int hist_entry__init(struct hist_entry *he,
                 map__get(he->mem_info->daddr.map);
         }
 
-        if (symbol_conf.use_callchain)
+        if (hist_entry__has_callchains(he) && symbol_conf.use_callchain)
                 callchain_init(he->callchain);
 
         if (he->raw_data) {
@@ -492,7 +492,7 @@ static u8 symbol__parent_filter(const struct symbol *parent)
 
 static void hist_entry__add_callchain_period(struct hist_entry *he, u64 period)
 {
-        if (!symbol_conf.use_callchain)
+        if (!hist_entry__has_callchains(he) || !symbol_conf.use_callchain)
                 return;
 
         he->hists->callchain_period += period;
@@ -986,7 +986,7 @@ iter_add_next_cumulative_entry(struct hist_entry_iter *iter,
         iter->he = he;
         he_cache[iter->curr++] = he;
 
-        if (symbol_conf.use_callchain)
+        if (hist_entry__has_callchains(he) && symbol_conf.use_callchain)
                 callchain_append(he->callchain, &cursor, sample->period);
         return 0;
 }
@@ -1373,7 +1373,8 @@ static int hists__hierarchy_insert_entry(struct hists *hists,
         if (new_he) {
                 new_he->leaf = true;
 
-                if (symbol_conf.use_callchain) {
+                if (hist_entry__has_callchains(new_he) &&
+                    symbol_conf.use_callchain) {
                         callchain_cursor_reset(&callchain_cursor);
                         if (callchain_merge(&callchain_cursor,
                                             new_he->callchain,
@@ -1414,7 +1415,7 @@ static int hists__collapse_insert_entry(struct hists *hists,
                         if (symbol_conf.cumulate_callchain)
                                 he_stat__add_stat(iter->stat_acc, he->stat_acc);
 
-                        if (symbol_conf.use_callchain) {
+                        if (hist_entry__has_callchains(he) && symbol_conf.use_callchain) {
                                 callchain_cursor_reset(&callchain_cursor);
                                 if (callchain_merge(&callchain_cursor,
                                                     iter->callchain,
diff --git a/tools/perf/util/hist.h b/tools/perf/util/hist.h
index cafafbf2aa9f..06607c434949 100644
--- a/tools/perf/util/hist.h
+++ b/tools/perf/util/hist.h
@@ -220,6 +220,12 @@ static inline struct hists *evsel__hists(struct perf_evsel *evsel)
         return &hevsel->hists;
 }
 
+static __pure inline bool hists__has_callchains(struct hists *hists)
+{
+        const struct perf_evsel *evsel = hists_to_evsel(hists);
+        return evsel__has_callchain(evsel);
+}
+
 int hists__init(void);
 int __hists__init(struct hists *hists, struct perf_hpp_list *hpp_list);
 
diff --git a/tools/perf/util/sort.h b/tools/perf/util/sort.h
index 1a046157bfef..7cf2d5cc038e 100644
--- a/tools/perf/util/sort.h
+++ b/tools/perf/util/sort.h
@@ -153,8 +153,7 @@ struct hist_entry {
 
 static __pure inline bool hist_entry__has_callchains(struct hist_entry *he)
 {
-        const struct perf_evsel *evsel = hists_to_evsel(he->hists);
-        return evsel__has_callchain(evsel);
+        return hists__has_callchains(he->hists);
 }
 
 static inline bool hist_entry__has_pairs(struct hist_entry *he)