diff mbox series

[09/12,v2] ring-buffer: Do not disable recording when there is an iterator

Message ID 20200319232732.839465737@goodmis.org
State Not Applicable
Delegated to: BPF Maintainers
Headers show
Series ring-buffer/tracing: Remove disabling of ring buffer while reading trace file | expand

Commit Message

Steven Rostedt March 19, 2020, 11:22 p.m. UTC 
From: "Steven Rostedt (VMware)" <rostedt@goodmis.org>

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: Steven Rostedt (VMware) <rostedt@goodmis.org>
---
 kernel/trace/ring_buffer.c | 2 --
 1 file changed, 2 deletions(-)
diff mbox series

Patch

diff --git a/kernel/trace/ring_buffer.c b/kernel/trace/ring_buffer.c
index 5979327254f9..8bafba674ec0 100644
--- a/kernel/trace/ring_buffer.c
+++ b/kernel/trace/ring_buffer.c
@@ -4295,7 +4295,6 @@  ring_buffer_read_prepare(struct trace_buffer *buffer, int cpu, gfp_t flags)
 	iter->cpu_buffer = cpu_buffer;
 
 	atomic_inc(&buffer->resize_disabled);
-	atomic_inc(&cpu_buffer->record_disabled);
 
 	return iter;
 }
@@ -4368,7 +4367,6 @@  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->buffer->resize_disabled);
 	kfree(iter->event);
 	kfree(iter);