linux-kernel - [PATCH v1 01/13] perf synthetic-events: Avoid unnecessary memset

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Message-Id: <20240817064442.2152089-2-irogers@google.com>
Date: Fri, 16 Aug 2024 23:44:30 -0700
From: Ian Rogers <irogers@...gle.com>
To: Peter Zijlstra <peterz@...radead.org>, Ingo Molnar <mingo@...hat.com>, 
	Arnaldo Carvalho de Melo <acme@...nel.org>, Namhyung Kim <namhyung@...nel.org>, 
	Mark Rutland <mark.rutland@....com>, 
	Alexander Shishkin <alexander.shishkin@...ux.intel.com>, Jiri Olsa <jolsa@...nel.org>, 
	Ian Rogers <irogers@...gle.com>, Adrian Hunter <adrian.hunter@...el.com>, 
	Kan Liang <kan.liang@...ux.intel.com>, Masahiro Yamada <masahiroy@...nel.org>, 
	Arnd Bergmann <arnd@...db.de>, Jann Horn <jannh@...gle.com>, 
	Colin Ian King <colin.i.king@...il.com>, Casey Chen <cachen@...estorage.com>, 
	Athira Rajeev <atrajeev@...ux.vnet.ibm.com>, 
	Chaitanya S Prakash <chaitanyas.prakash@....com>, James Clark <james.clark@...aro.org>, 
	Ze Gao <zegao2021@...il.com>, Yang Jihong <yangjihong1@...wei.com>, 
	Yunseong Kim <yskelg@...il.com>, Weilin Wang <weilin.wang@...el.com>, 
	Dominique Martinet <asmadeus@...ewreck.org>, Anne Macedo <retpolanne@...teo.net>, 
	Sun Haiyong <sunhaiyong@...ngson.cn>, linux-perf-users@...r.kernel.org, 
	linux-kernel@...r.kernel.org
Subject: [PATCH v1 01/13] perf synthetic-events: Avoid unnecessary memset

Make sure the memset of a synthesized event only zeros the necessary
tracing data part of the event, as a full event can be over 4kb in
size.

Signed-off-by: Ian Rogers <irogers@...gle.com>
---
 tools/perf/util/synthetic-events.c | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/tools/perf/util/synthetic-events.c b/tools/perf/util/synthetic-events.c
index 7f884d70de81..0a7f93ae76fb 100644
--- a/tools/perf/util/synthetic-events.c
+++ b/tools/perf/util/synthetic-events.c
@@ -2200,7 +2200,7 @@ int perf_event__synthesize_tracing_data(const struct perf_tool *tool, int fd, st
 	if (!tdata)
 		return -1;
 
-	memset(&ev, 0, sizeof(ev));
+	memset(&ev, 0, sizeof(ev.tracing_data));
 
 	ev.tracing_data.header.type = PERF_RECORD_HEADER_TRACING_DATA;
 	size = tdata->size;
-- 
2.46.0.184.g6999bdac58-goog