perf tools: Lock to protect namespaces and comm list
Add two locks to protect namespaces_list and comm_list.
The lock is only needed for multithreaded code, so using mutex wrappers
provided by perf tool.
Not all the comm_list/namespaces_list accessing are protected, e.g.
thread__exec_comm. Because the multithread code for perf top event
synthesizing does not touch them. They don't need a lock.
Signed-off-by: Kan Liang <kan.liang@intel.com>
Acked-by: Jiri Olsa <jolsa@kernel.org>
Cc: Adrian Hunter <adrian.hunter@intel.com>
Cc: Alexei Starovoitov <ast@kernel.org>
Cc: Andi Kleen <ak@linux.intel.com>
Cc: He Kuang <hekuang@huawei.com>
Cc: Lukasz Odzioba <lukasz.odzioba@intel.com>
Cc: Namhyung Kim <namhyung@kernel.org>
Cc: Peter Zijlstra <peterz@infradead.org>
Cc: Wang Nan <wangnan0@huawei.com>
Link: http://lkml.kernel.org/r/1506696477-146932-2-git-send-email-kan.liang@intel.com
Signed-off-by: Arnaldo Carvalho de Melo <acme@redhat.com>
diff --git a/tools/perf/util/thread.h b/tools/perf/util/thread.h
index cb1a5dd..10555d6 100644
--- a/tools/perf/util/thread.h
+++ b/tools/perf/util/thread.h
@@ -9,6 +9,7 @@
#include "symbol.h"
#include <strlist.h>
#include <intlist.h>
+#include "rwsem.h"
struct thread_stack;
struct unwind_libunwind_ops;
@@ -29,7 +30,9 @@ struct thread {
int comm_len;
bool dead; /* if set thread has exited */
struct list_head namespaces_list;
+ struct rw_semaphore namespaces_lock;
struct list_head comm_list;
+ struct rw_semaphore comm_lock;
u64 db_id;
void *priv;