perf: Support only inheriting events if cloned with CLONE_THREAD
Adds bit perf_event_attr::inherit_thread, to restricting inheriting
events only if the child was cloned with CLONE_THREAD.
This option supports the case where an event is supposed to be
process-wide only (including subthreads), but should not propagate
beyond the current process's shared environment.
Suggested-by: Peter Zijlstra <peterz@infradead.org>
Signed-off-by: Marco Elver <elver@google.com>
Signed-off-by: Peter Zijlstra (Intel) <peterz@infradead.org>
Link: https://lore.kernel.org/lkml/YBvj6eJR%2FDY2TsEB@hirez.programming.kicks-ass.net/
diff --git a/kernel/fork.c b/kernel/fork.c
index 0acc8ed1..3728a645 100644
--- a/kernel/fork.c
+++ b/kernel/fork.c
@@ -2078,7 +2078,7 @@ static __latent_entropy struct task_struct *copy_process(
if (retval)
goto bad_fork_cleanup_policy;
- retval = perf_event_init_task(p);
+ retval = perf_event_init_task(p, clone_flags);
if (retval)
goto bad_fork_cleanup_policy;
retval = audit_alloc(p);