linux-kernel - [PATCH] perf hist: Improve srcfile sort key performance (really)

lists.openwall.net		lists / announce owl-users owl-dev john-users john-dev passwdqc-users yescrypt popa3d-users / oss-security kernel-hardening musl sabotage tlsify passwords / crypt-dev xvendor / Bugtraq Full-Disclosure linux-kernel linux-netdev linux-ext4 linux-hardening linux-cve-announce PHC
Open Source and information security mailing list archives

Hash Suite: Windows password security audit tool. GUI, reports in PDF.

[<prev] [next>] [thread-next>] [day] [month] [year] [list]

Date:   Wed, 22 Mar 2023 19:50:05 -0700
From:   Namhyung Kim <namhyung@...nel.org>
To:     Arnaldo Carvalho de Melo <acme@...nel.org>,
        Jiri Olsa <jolsa@...nel.org>
Cc:     Ian Rogers <irogers@...gle.com>,
        Adrian Hunter <adrian.hunter@...el.com>,
        Peter Zijlstra <peterz@...radead.org>,
        Ingo Molnar <mingo@...nel.org>,
        LKML <linux-kernel@...r.kernel.org>,
        linux-perf-users@...r.kernel.org
Subject: [PATCH] perf hist: Improve srcfile sort key performance (really)

The earlier commit f0cdde28fecc ("perf hist: Improve srcfile sort key
performance") updated the srcfile logic but missed to change the ->cmp()
callback which is called for every sample.  It should use the same logic
like in the srcline to speed up the processing because it'd return the
same information repeatedly for the same address.  The real processing
will be done in sort__srcfile_collapse().

Fixes: pf0cdde28fecc ("perf hist: Improve srcfile sort key performance")
Signed-off-by: Namhyung Kim <namhyung@...nel.org>
---
 tools/perf/util/sort.c | 7 +------
 1 file changed, 1 insertion(+), 6 deletions(-)

diff --git a/tools/perf/util/sort.c b/tools/perf/util/sort.c
index e11e68ecf0a2..2b5cc8e4aa6e 100644
--- a/tools/perf/util/sort.c
+++ b/tools/perf/util/sort.c
@@ -657,12 +657,7 @@ static char *hist_entry__get_srcfile(struct hist_entry *e)
 static int64_t
 sort__srcfile_cmp(struct hist_entry *left, struct hist_entry *right)
 {
-	if (!left->srcfile)
-		left->srcfile = hist_entry__get_srcfile(left);
-	if (!right->srcfile)
-		right->srcfile = hist_entry__get_srcfile(right);
-
-	return strcmp(right->srcfile, left->srcfile);
+	return sort__srcline_cmp(left, right);
 }
 
 static int64_t
-- 
2.40.0.rc1.284.g88254d51c5-goog