perf hists browser: Print overhead percent value for first-level callchain

Currently perf report on TUI doesn't print percent for first-level
callchain entry.

I guess it (wrongly) assumes that there's only a single callchain in the
first level.

This patch fixes it by handling the first level callchains same as
others - if it's not 100% it should print the percent value.

Also it'll affect other callchains in the other way around - if it's
100% (single callchain) it should not print the percentage.

Before:
  -   30.95%     6.84%  abc2     abc2              [.] a
     - a
        - 70.00% c
           - 100.00% apic_timer_interrupt
                smp_apic_timer_interrupt
                local_apic_timer_interrupt
                hrtimer_interrupt
                ...
        + 30.00% b
     + __libc_start_main

After:
  -   30.95%     6.84%  abc2     abc2              [.] a
     - 77.90% a
        - 70.00% c
           - apic_timer_interrupt
             smp_apic_timer_interrupt
             local_apic_timer_interrupt
             hrtimer_interrupt
             ...
        + 30.00% b
     + 22.10% __libc_start_main

Reported-by: Arnaldo Carvalho de Melo <acme@redhat.com>
Signed-off-by: Namhyung Kim <namhyung@kernel.org>
Cc: Andi Kleen <andi@firstfloor.org>
Cc: David Ahern <dsahern@gmail.com>
Cc: Frederic Weisbecker <fweisbec@gmail.com>
Cc: Ingo Molnar <mingo@kernel.org>
Cc: Jiri Olsa <jolsa@redhat.com>
Cc: Namhyung Kim <namhyung.kim@lge.com>
Cc: Paul Mackerras <paulus@samba.org>
Cc: Peter Zijlstra <a.p.zijlstra@chello.nl>
Link: http://lkml.kernel.org/r/1416816807-6495-1-git-send-email-namhyung@kernel.org
Signed-off-by: Arnaldo Carvalho de Melo <acme@redhat.com>

diff --git a/tools/perf/ui/browsers/hists.c b/tools/perf/ui/browsers/hists.c
index 12c17c5..8d22905 100644 (file)
--- a/tools/perf/ui/browsers/hists.c
+++ b/tools/perf/ui/browsers/hists.c
@@ -542,8 +542,11 @@ static int hist_browser__show_callchain(struct hist_browser *browser,
        struct rb_node *node;
        int first_row = row, offset = level * LEVEL_OFFSET_STEP;
        u64 new_total;
+       bool need_percent;
 
        node = rb_first(root);
+       need_percent = !!rb_next(node);
+
        while (node) {
                struct callchain_node *child = rb_entry(node, struct callchain_node, rb_node);
                struct rb_node *next = rb_next(node);
@@ -560,7 +563,7 @@ static int hist_browser__show_callchain(struct hist_browser *browser,
 
                        if (first)
                                first = false;
-                       else if (level > 1)
+                       else if (need_percent)
                                extra_offset = LEVEL_OFFSET_STEP;
 
                        folded_sign = callchain_list__folded(chain);
@@ -573,7 +576,7 @@ static int hist_browser__show_callchain(struct hist_browser *browser,
                        str = callchain_list__sym_name(chain, bf, sizeof(bf),
                                                       browser->show_dso);
 
-                       if (was_first && level > 1) {
+                       if (was_first && need_percent) {
                                double percent = cumul * 100.0 / total;
 
                                if (asprintf(&alloc_str, "%2.2f%% %s", percent, str) < 0)
@@ -790,6 +793,13 @@ static int hist_browser__show_entry(struct hist_browser *browser,
                        .is_current_entry = current_entry,
                };
 
+               if (callchain_param.mode == CHAIN_GRAPH_REL) {
+                       if (symbol_conf.cumulate_callchain)
+                               total = entry->stat_acc->period;
+                       else
+                               total = entry->stat.period;
+               }
+
                printed += hist_browser__show_callchain(browser,
                                        &entry->sorted_chain, 1, row, total,
                                        hist_browser__show_callchain_entry, &arg,