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perf hists: Introduce hists__match_hierarchy() 

The hists__match_hierarchy() is to find matching hist entries in a
group.  A matching entry has the same values for all sort keys given.

With an event group (e.g.: -e "{cycles,instructions}"), a leader event
should show other members in a group.  So each entry in the leader
should be able to find its pair entries which have same values.

With hierarchy mode, it needs to search all matching children in a
hierarchy.

An example output looks like:

  #               Overhead  Command / Shared Object / Symbol
  # ......................  ..................................
  #
      25.74%  27.18%        sh
         19.96%  24.14%        libc-2.24.so
            9.55%  14.64%        [.] __strcmp_sse2
            1.54%   0.00%        [.] __tfind
            1.07%   1.13%        [.] _int_malloc
  ...

In the above example, two overheads are shown - one for the leader and
another for the other group member.  They were matched since their
command, dso and symbol have the same values.

Signed-off-by: Namhyung Kim <namhyung@kernel.org>
Cc: Andi Kleen <andi@firstfloor.org>
Cc: Jiri Olsa <jolsa@kernel.org>
Cc: Peter Zijlstra <a.p.zijlstra@chello.nl>
Link: http://lkml.kernel.org/r/20160913074552.13284-2-namhyung@kernel.org
Signed-off-by: Arnaldo Carvalho de Melo <acme@redhat.com>
This commit is contained in:
Namhyung Kim 2016-09-13 16:45:46 +09:00 committed by Arnaldo Carvalho de Melo
parent 0a4a7e435f
commit 09034de63e
1 changed files with 51 additions and 0 deletions
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51
tools/perf/util/hist.c
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@ -2174,6 +2174,51 @@ static struct hist_entry *hists__find_entry(struct hists *hists,
return NULL;
}
static struct hist_entry *hists__find_hierarchy_entry(struct rb_root *root,
struct hist_entry *he)
{
struct rb_node *n = root->rb_node;
while (n) {
struct hist_entry *iter;
struct perf_hpp_fmt *fmt;
int64_t cmp = 0;
iter = rb_entry(n, struct hist_entry, rb_node_in);
perf_hpp_list__for_each_sort_list(he->hpp_list, fmt) {
cmp = fmt->collapse(fmt, iter, he);
if (cmp)
break;
}
if (cmp < 0)
n = n->rb_left;
else if (cmp > 0)
n = n->rb_right;
else
return iter;
}
return NULL;
}
static void hists__match_hierarchy(struct rb_root *leader_root,
struct rb_root *other_root)
{
struct rb_node *nd;
struct hist_entry *pos, *pair;
for (nd = rb_first(leader_root); nd; nd = rb_next(nd)) {
pos = rb_entry(nd, struct hist_entry, rb_node_in);
pair = hists__find_hierarchy_entry(other_root, pos);
if (pair) {
hist_entry__add_pair(pair, pos);
hists__match_hierarchy(&pos->hroot_in, &pair->hroot_in);
}
}
}
/*
* Look for pairs to link to the leader buckets (hist_entries):
*/
@ -2183,6 +2228,12 @@ void hists__match(struct hists *leader, struct hists *other)
struct rb_node *nd;
struct hist_entry *pos, *pair;
if (symbol_conf.report_hierarchy) {
/* hierarchy report always collapses entries */
return hists__match_hierarchy(&leader->entries_collapsed,
&other->entries_collapsed);
}
if (hists__has(leader, need_collapse))
root = &leader->entries_collapsed;
else