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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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14
tools/perf/tests/hists_cumulate.c
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@@ -125,8 +125,8 @@ out:
static void del_hist_entries(struct hists *hists)
{
struct hist_entry *he;
struct rb_root *root_in;
struct rb_root *root_out;
struct rb_root_cached *root_in;
struct rb_root_cached *root_out;
struct rb_node *node;
if (hists__has(hists, need_collapse))
@@ -136,12 +136,12 @@ static void del_hist_entries(struct hists *hists)
root_out = &hists->entries;
while (!RB_EMPTY_ROOT(root_out)) {
node = rb_first(root_out);
while (!RB_EMPTY_ROOT(&root_out->rb_root)) {
node = rb_first_cached(root_out);
he = rb_entry(node, struct hist_entry, rb_node);
rb_erase(node, root_out);
rb_erase(&he->rb_node_in, root_in);
rb_erase_cached(node, root_out);
rb_erase_cached(&he->rb_node_in, root_in);
hist_entry__delete(he);
}
}
@@ -198,7 +198,7 @@ static int do_test(struct hists *hists, struct result *expected, size_t nr_expec
print_hists_out(hists);
}
root = &hists->entries;
root = &hists->entries.rb_root;
for (node = rb_first(root), i = 0;
node && (he = rb_entry(node, struct hist_entry, rb_node));
node = rb_next(node), i++) {