diff options
| author | Davidlohr Bueso <dave@stgolabs.net> | 2018-12-06 11:18:18 -0800 |
|---|---|---|
| committer | Arnaldo Carvalho de Melo <acme@redhat.com> | 2019-01-25 15:12:10 +0100 |
| commit | 2eb3d6894ae3b9cc8a94c91458a041c45773f23d (patch) | |
| tree | 146c0a9ee9b5177a0142319aa606dc1dd18de79b /tools/perf/util/sort.h | |
| parent | 7137ff50b68a48bc28270c91b1c313259ab0c1c4 (diff) | |
perf hist: 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 heavily required for histograms. Specifically, the following
are converted to rb_root_cached, and users accordingly:
hist::entries_in_array
hist::entries_in
hist::entries
hist::entries_collapsed
hist_entry::hroot_in
hist_entry::hroot_out
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/20181206191819.30182-7-dave@stgolabs.net
[ Added some missing conversions to rb_first_cached() ]
Signed-off-by: Arnaldo Carvalho de Melo <acme@redhat.com>
Diffstat (limited to 'tools/perf/util/sort.h')
| -rw-r--r-- | tools/perf/util/sort.h | 4 |
1 files changed, 2 insertions, 2 deletions
diff --git a/tools/perf/util/sort.h b/tools/perf/util/sort.h index 130fe37fe2df..dd6312876492 100644 --- a/tools/perf/util/sort.h +++ b/tools/perf/util/sort.h @@ -145,8 +145,8 @@ struct hist_entry { union { /* this is for hierarchical entry structure */ struct { - struct rb_root hroot_in; - struct rb_root hroot_out; + struct rb_root_cached hroot_in; + struct rb_root_cached hroot_out; }; /* non-leaf entries */ struct rb_root sorted_chain; /* leaf entry has callchains */ }; |