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| author |   Davidlohr Bueso <dave@stgolabs.net> | 2018-12-06 11:18:14 -0800 |
|---|---|---|
| committer |   Arnaldo Carvalho de Melo <acme@redhat.com> | 2019-01-25 15:12:09 +0100 |
| commit | f3acb3a8a2081344801974ac5ec8e1b0d6f0ef36 (patch) | |
| tree | 0bc3576849c9ff99905e7af40e9d5fb1bfa08249 /tools/perf/util/build-id.c | |
| parent | tools: Update rbtree implementation (diff) | |
| download | linux-dev-f3acb3a8a2081344801974ac5ec8e1b0d6f0ef36.tar.xz linux-dev-f3acb3a8a2081344801974ac5ec8e1b0d6f0ef36.zip | |
perf machine: Use cached rbtrees
At the cost of an extra pointer, we can avoid the O(logN) cost of
finding the first element in the tree (smallest node), which is
something required for nearly every operation dealing with
machine->guests and threads->entries.
The conversion is straightforward, however, it's worth noticing that the
rb_erase_init() calls have been replaced by rb_erase_cached() which has
no _init() flavor, however, the node is explicitly cleared next anyway,
which was redundant until now.
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/20181206191819.30182-3-dave@stgolabs.net
Signed-off-by: Arnaldo Carvalho de Melo <acme@redhat.com>
Diffstat (limited to 'tools/perf/util/build-id.c')
| -rw-r--r-- | tools/perf/util/build-id.c | 12 |
1 files changed, 8 insertions, 4 deletions
diff --git a/tools/perf/util/build-id.c b/tools/perf/util/build-id.c index 07ef7fad689c..2ff802068f06 100644 --- a/tools/perf/util/build-id.c +++ b/tools/perf/util/build-id.c @@ -364,7 +364,8 @@ int perf_session__write_buildid_table(struct perf_session *session, if (err) return err; - for (nd = rb_first(&session->machines.guests); nd; nd = rb_next(nd)) { + for (nd = rb_first_cached(&session->machines.guests); nd; + nd = rb_next(nd)) { struct machine *pos = rb_entry(nd, struct machine, rb_node); err = machine__write_buildid_table(pos, fd); if (err) @@ -397,7 +398,8 @@ int dsos__hit_all(struct perf_session *session) if (err) return err; - for (nd = rb_first(&session->machines.guests); nd; nd = rb_next(nd)) { + for (nd = rb_first_cached(&session->machines.guests); nd; + nd = rb_next(nd)) { struct machine *pos = rb_entry(nd, struct machine, rb_node); err = machine__hit_all_dsos(pos); @@ -850,7 +852,8 @@ int perf_session__cache_build_ids(struct perf_session *session) ret = machine__cache_build_ids(&session->machines.host); - for (nd = rb_first(&session->machines.guests); nd; nd = rb_next(nd)) { + for (nd = rb_first_cached(&session->machines.guests); nd; + nd = rb_next(nd)) { struct machine *pos = rb_entry(nd, struct machine, rb_node); ret |= machine__cache_build_ids(pos); } @@ -867,7 +870,8 @@ bool perf_session__read_build_ids(struct perf_session *session, bool with_hits) struct rb_node *nd; bool ret = machine__read_build_ids(&session->machines.host, with_hits); - for (nd = rb_first(&session->machines.guests); nd; nd = rb_next(nd)) { + for (nd = rb_first_cached(&session->machines.guests); nd; + nd = rb_next(nd)) { struct machine *pos = rb_entry(nd, struct machine, rb_node); ret |= machine__read_build_ids(pos, with_hits); } |