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perf: Support only inheriting events if cloned with CLONE_THREAD

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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/
This commit is contained in:
Marco Elver
2021-04-08 12:35:58 +02:00
committed by Peter Zijlstra
parent 47f661eca0
commit 2b26f0aa00
4 changed files with 20 additions and 11 deletions
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2
kernel/fork.c
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@ -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);