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Subject[PATCH 5/5] perf diff: Fix support for all --sort combinations
Date
From: Arnaldo Carvalho de Melo <acme@redhat.com>

When we finish creating the hist_entries we _already_ have them sorted "by
name", in fact by what is in --sort, that is exactly how we can find the pairs
in perf_session__match_hists as 'comm', 'dso' & 'symbol' all are strings we
need to find the matches in the baseline session.

So only do the sort by hits followed by a resort by --sort if we need to find
the position for shwowing the --displacement of hist entries.

Now all these modes work correctly:

Example is a simple 'perf record -f find / > /dev/null' ran twice then followed
by the following commands:
$ perf diff -f --sort comm
# Baseline Delta Command
# ........ .......... .......
#
0.00% +100.00% find
$ perf diff -f --sort dso
# Baseline Delta Shared Object
# ........ .......... ..................
#
59.97% -0.44% [kernel]
21.17% +0.28% libc-2.5.so
18.49% +0.16% [ext3]
0.37% find
$ perf diff -f --sort symbol | head -8
# Baseline Delta Symbol
# ........ .......... ......
#
6.21% +0.36% [k] ext3fs_dirhash
3.43% +0.41% [.] __GI_strlen
3.53% +0.16% [k] __kmalloc
3.17% +0.49% [k] system_call
3.06% +0.37% [k] ext3_htree_store_dirent
$ perf diff -f --sort dso,symbol | head -8
# Baseline Delta Shared Object Symbol
# ........ .......... .................. ......
#
6.21% +0.36% [ext3] [k] ext3fs_dirhash
3.43% +0.41% libc-2.5.so [.] __GI_strlen
3.53% +0.16% [kernel] [k] __kmalloc
3.17% +0.49% [kernel] [k] system_call
3.06% +0.37% [ext3] [k] ext3_htree_store_dirent
$
And we don't have to do two expensive resorts in the common, non --displacement
case.

Cc: Frédéric Weisbecker <fweisbec@gmail.com>
Cc: Mike Galbraith <efault@gmx.de>
Cc: Peter Zijlstra <a.p.zijlstra@chello.nl>
Cc: Paul Mackerras <paulus@samba.org>
Signed-off-by: Arnaldo Carvalho de Melo <acme@redhat.com>
---
tools/perf/builtin-diff.c | 52 ++++++++++++++++++--------------------------
1 files changed, 21 insertions(+), 31 deletions(-)
diff --git a/tools/perf/builtin-diff.c b/tools/perf/builtin-diff.c
index 876a4b9..924bfb7 100644
--- a/tools/perf/builtin-diff.c
+++ b/tools/perf/builtin-diff.c
@@ -82,29 +82,19 @@ static void perf_session__insert_hist_entry_by_name(struct rb_root *root,
struct hist_entry *iter;

while (*p != NULL) {
- int cmp;
parent = *p;
iter = rb_entry(parent, struct hist_entry, rb_node);
-
- cmp = strcmp(he->map->dso->name, iter->map->dso->name);
- if (cmp > 0)
+ if (hist_entry__cmp(he, iter) < 0)
p = &(*p)->rb_left;
- else if (cmp < 0)
+ else
p = &(*p)->rb_right;
- else {
- cmp = strcmp(he->sym->name, iter->sym->name);
- if (cmp > 0)
- p = &(*p)->rb_left;
- else
- p = &(*p)->rb_right;
- }
}

rb_link_node(&he->rb_node, parent, p);
rb_insert_color(&he->rb_node, root);
}

-static void perf_session__resort_by_name(struct perf_session *self)
+static void perf_session__resort_hist_entries(struct perf_session *self)
{
unsigned long position = 1;
struct rb_root tmp = RB_ROOT;
@@ -122,29 +112,28 @@ static void perf_session__resort_by_name(struct perf_session *self)
self->hists = tmp;
}

+static void perf_session__set_hist_entries_positions(struct perf_session *self)
+{
+ perf_session__output_resort(self, self->events_stats.total);
+ perf_session__resort_hist_entries(self);
+}
+
static struct hist_entry *
-perf_session__find_hist_entry_by_name(struct perf_session *self,
- struct hist_entry *he)
+perf_session__find_hist_entry(struct perf_session *self,
+ struct hist_entry *he)
{
struct rb_node *n = self->hists.rb_node;

while (n) {
struct hist_entry *iter = rb_entry(n, struct hist_entry, rb_node);
- int cmp = strcmp(he->map->dso->name, iter->map->dso->name);
+ int64_t cmp = hist_entry__cmp(he, iter);

- if (cmp > 0)
+ if (cmp < 0)
n = n->rb_left;
- else if (cmp < 0)
+ else if (cmp > 0)
n = n->rb_right;
- else {
- cmp = strcmp(he->sym->name, iter->sym->name);
- if (cmp > 0)
- n = n->rb_left;
- else if (cmp < 0)
- n = n->rb_right;
- else
- return iter;
- }
+ else
+ return iter;
}

return NULL;
@@ -155,11 +144,9 @@ static void perf_session__match_hists(struct perf_session *old_session,
{
struct rb_node *nd;

- perf_session__resort_by_name(old_session);
-
for (nd = rb_first(&new_session->hists); nd; nd = rb_next(nd)) {
struct hist_entry *pos = rb_entry(nd, struct hist_entry, rb_node);
- pos->pair = perf_session__find_hist_entry_by_name(old_session, pos);
+ pos->pair = perf_session__find_hist_entry(old_session, pos);
}
}

@@ -177,9 +164,12 @@ static int __cmd_diff(void)
ret = perf_session__process_events(session[i], &event_ops);
if (ret)
goto out_delete;
- perf_session__output_resort(session[i], session[i]->events_stats.total);
}

+ perf_session__output_resort(session[1], session[1]->events_stats.total);
+ if (show_displacement)
+ perf_session__set_hist_entries_positions(session[0]);
+
perf_session__match_hists(session[0], session[1]);
perf_session__fprintf_hists(session[1], session[0],
show_displacement, stdout);
--
1.5.5.1
--
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