perf: Fix header.size for namespace events

[ 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@verizon.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>

diff --git a/kernel/events/core.c b/kernel/events/core.c
index 8c20af8..f42f7c7 100644 (file)
--- 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,