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perf hist: 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), 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>
This commit is contained in:
Davidlohr Bueso
2018-12-06 11:18:18 -08:00
committed by Arnaldo Carvalho de Melo
parent 7137ff50b6
commit 2eb3d6894a
14 changed files with 173 additions and 147 deletions
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3
tools/perf/ui/stdio/hist.c
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@@ -788,7 +788,8 @@ size_t hists__fprintf(struct hists *hists, bool show_header, int max_rows,
indent = hists__overhead_width(hists) + 4;
for (nd = rb_first(&hists->entries); nd; nd = __rb_hierarchy_next(nd, HMD_FORCE_CHILD)) {
for (nd = rb_first_cached(&hists->entries); nd;
nd = __rb_hierarchy_next(nd, HMD_FORCE_CHILD)) {
struct hist_entry *h = rb_entry(nd, struct hist_entry, rb_node);
float percent;