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perf symbols: Use cached rbtrees

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At the cost of an extra pointer, we can avoid the O(logN) cost of
finding the first element in the tree (smallest node).

Signed-off-by: Davidlohr Bueso <dbueso@suse.de>
Tested-by: Arnaldo Carvalho de Melo <acme@redhat.com>
Cc: Jiri Olsa <jolsa@kernel.org>
Cc: Namhyung Kim <namhyung@kernel.org>
Link: http://lkml.kernel.org/r/20181206191819.30182-6-dave@stgolabs.net
Signed-off-by: Arnaldo Carvalho de Melo <acme@redhat.com>
This commit is contained in:
Davidlohr Bueso 2018-12-06 11:18:17 -08:00 • committed by Arnaldo Carvalho de Melo
parent ca2270292e
commit 7137ff50b6
8 changed files with 67 additions and 58 deletions
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8
tools/perf/util/map.c
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@ -286,8 +286,8 @@ void map__put(struct map *map)
void map__fixup_start(struct map *map)
{
struct rb_root *symbols = &map->dso->symbols;
struct rb_node *nd = rb_first(symbols);
struct rb_root_cached *symbols = &map->dso->symbols;
struct rb_node *nd = rb_first_cached(symbols);
if (nd != NULL) {
struct symbol *sym = rb_entry(nd, struct symbol, rb_node);
map->start = sym->start;
@ -296,8 +296,8 @@ void map__fixup_start(struct map *map)
void map__fixup_end(struct map *map)
{
struct rb_root *symbols = &map->dso->symbols;
struct rb_node *nd = rb_last(symbols);
struct rb_root_cached *symbols = &map->dso->symbols;
struct rb_node *nd = rb_last(&symbols->rb_root);
if (nd != NULL) {
struct symbol *sym = rb_entry(nd, struct symbol, rb_node);
map->end = sym->end;