linux-kernel - [PATCH 06/19] perf c2c: Use mem

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 for Android: free password hash cracker in your pocket

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

Message-Id: <20180307155020.32613-7-jolsa@kernel.org>
Date:   Wed,  7 Mar 2018 16:50:07 +0100
From:   Jiri Olsa <jolsa@...nel.org>
To:     Arnaldo Carvalho de Melo <acme@...nel.org>
Cc:     lkml <linux-kernel@...r.kernel.org>,
        Ingo Molnar <mingo@...nel.org>,
        Namhyung Kim <namhyung@...nel.org>,
        David Ahern <dsahern@...il.com>,
        Alexander Shishkin <alexander.shishkin@...ux.intel.com>,
        Peter Zijlstra <a.p.zijlstra@...llo.nl>
Subject: [PATCH 06/19] perf c2c: Use mem_info refcnt logic

Switch to refcnt logic instead of duplicating
mem_info objects. No functional change, just
saving some memory.

Link: http://lkml.kernel.org/n/tip-jdirhp2lff9qhtrbxlcgzr7r@git.kernel.org
Signed-off-by: Jiri Olsa <jolsa@...nel.org>
---
 tools/perf/builtin-c2c.c | 24 +++++++++++-------------
 1 file changed, 11 insertions(+), 13 deletions(-)

diff --git a/tools/perf/builtin-c2c.c b/tools/perf/builtin-c2c.c
index 539c3d460158..98d243fa0c06 100644
--- a/tools/perf/builtin-c2c.c
+++ b/tools/perf/builtin-c2c.c
@@ -237,9 +237,12 @@ static int process_sample_event(struct perf_tool *tool __maybe_unused,
 	if (mi == NULL)
 		return -ENOMEM;
 
-	mi_dup = memdup(mi, sizeof(*mi));
-	if (!mi_dup)
-		goto free_mi;
+	/*
+	 * The mi object is released in hists__add_entry_ops,
+	 * if it gets sorted out into existing data, so we need
+	 * to take the copy now.
+	 */
+	mi_dup = mem_info__get(mi);
 
 	c2c_decode_stats(&stats, mi);
 
@@ -247,7 +250,7 @@ static int process_sample_event(struct perf_tool *tool __maybe_unused,
 				  &al, NULL, NULL, mi,
 				  sample, true);
 	if (he == NULL)
-		goto free_mi_dup;
+		goto free_mi;
 
 	c2c_he = container_of(he, struct c2c_hist_entry, he);
 	c2c_add_stats(&c2c_he->stats, &stats);
@@ -272,19 +275,15 @@ static int process_sample_event(struct perf_tool *tool __maybe_unused,
 
 		mi = mi_dup;
 
-		mi_dup = memdup(mi, sizeof(*mi));
-		if (!mi_dup)
-			goto free_mi;
-
 		c2c_hists = he__get_c2c_hists(he, c2c.cl_sort, 2);
 		if (!c2c_hists)
-			goto free_mi_dup;
+			goto free_mi;
 
 		he = hists__add_entry_ops(&c2c_hists->hists, &c2c_entry_ops,
 					  &al, NULL, NULL, mi,
 					  sample, true);
 		if (he == NULL)
-			goto free_mi_dup;
+			goto free_mi;
 
 		c2c_he = container_of(he, struct c2c_hist_entry, he);
 		c2c_add_stats(&c2c_he->stats, &stats);
@@ -303,10 +302,9 @@ static int process_sample_event(struct perf_tool *tool __maybe_unused,
 	addr_location__put(&al);
 	return ret;
 
-free_mi_dup:
-	free(mi_dup);
 free_mi:
-	free(mi);
+	mem_info__put(mi_dup);
+	mem_info__put(mi);
 	ret = -ENOMEM;
 	goto out;
 }
-- 
2.13.6