[PATCH AUTOSEL for 4.14 014/100] perf: Fix header.size for namespace events

Sasha Levin
2018-01-28T22:26:16Z

From: Jiri Olsa <jolsa@kernel.org>

[ Upstream commit 34900ec5c9577cc1b0f22887ac7349f458ba8ac2 ]

Reset header size for namespace events, otherwise it only gets bigger in
ctx iterations.

Signed-off-by: Jiri Olsa <jolsa@kernel.org>
Acked-by: Peter Zijlstra (Intel) <peterz@infradead.org>
Fixes: e422267322cd ("perf: Add PERF_RECORD_NAMESPACES to include namespaces related info")
Link: http://lkml.kernel.org/n/tip-nlo4gonz9d4guyb8153ukzt0@git.kernel.org
Signed-off-by: Arnaldo Carvalho de Melo <acme@redhat.com>
Signed-off-by: Sasha Levin <alexander.levin@microsoft.com>
---
kernel/events/core.c | 5 ++++-
1 file changed, 4 insertions(+), 1 deletion(-)

diff --git a/kernel/events/core.c b/kernel/events/core.c
index 24ebad5567b4..5253dbba66ea 100644
--- a/kernel/events/core.c
+++ b/kernel/events/core.c
@@ -6719,6 +6719,7 @@ static void perf_event_namespaces_output(struct perf_event *event,
struct perf_namespaces_event *namespaces_event = data;
struct perf_output_handle handle;
struct perf_sample_data sample;
+ u16 header_size = namespaces_event->event_id.header.size;
int ret;

if (!perf_event_namespaces_match(event))
@@ -6729,7 +6730,7 @@ static void perf_event_namespaces_output(struct perf_event *event,
ret = perf_output_begin(&handle, event,
namespaces_event->event_id.header.size);
if (ret)
- return;
+ goto out;

namespaces_event->event_id.pid = perf_event_pid(event,
namespaces_event->task);
@@ -6741,6 +6742,8 @@ static void perf_event_namespaces_output(struct perf_event *event,
perf_event__output_id_sample(event, &handle, &sample);

perf_output_end(&handle);
+out:
+ namespaces_event->event_id.header.size = header_size;
}

static void perf_fill_ns_link_info(struct perf_ns_link_info *ns_link_info,
--
2.11.0