ring-buffer: Do not disable recording when there is an iterator (1039221c) · Commits · 戴 / test

Now that the iterator can handle a concurrent writer, do not disable writing to the ring buffer when there is an iterator present. Link: http://lkml.kernel.org/r/20200317213416.759770696@goodmis.org Signed-off-by:

kernel/trace/ring_buffer.c

+0 −2

Original line number	Diff line number	Diff line
		@@ -4312,7 +4312,6 @@ ring_buffer_read_prepare(struct trace_buffer *buffer, int cpu, gfp_t flags)
		iter->cpu_buffer = cpu_buffer;

		atomic_inc(&cpu_buffer->resize_disabled);
		atomic_inc(&cpu_buffer->record_disabled);

		return iter;
		}
		@@ -4385,7 +4384,6 @@ ring_buffer_read_finish(struct ring_buffer_iter *iter)
		rb_check_pages(cpu_buffer);
		raw_spin_unlock_irqrestore(&cpu_buffer->reader_lock, flags);

		atomic_dec(&cpu_buffer->record_disabled);
		atomic_dec(&cpu_buffer->resize_disabled);
		kfree(iter->event);
		kfree(iter);