From f0b70cc48cc282cb326a4d71b3d1dda7d8fafd2a Mon Sep 17 00:00:00 2001 From: "Steven Rostedt (Red Hat)" Date: Tue, 10 Jun 2014 12:06:30 -0400 Subject: [PATCH] tracing: Fix leak of per cpu max data in instances The freeing of an instance, if max data is configured, there will be per cpu data structures created. But these are not freed when the instance is deleted, which causes a memory leak. A new helper function is added that frees the individual buffers within a trace array, instead of duplicating the code. This way changes made for one are applied to the other (normal buffer vs max buffer). Link: http://lkml.kernel.org/r/87k38pbake.fsf@sejong.aot.lge.com Reported-by: Namhyung Kim Signed-off-by: Steven Rostedt --- kernel/trace/trace.c | 21 ++++++++++++--------- 1 file changed, 12 insertions(+), 9 deletions(-) diff --git a/kernel/trace/trace.c b/kernel/trace/trace.c index 2b458c60e0da..384ede311717 100644 --- a/kernel/trace/trace.c +++ b/kernel/trace/trace.c @@ -6242,22 +6242,25 @@ static int allocate_trace_buffers(struct trace_array *tr, int size) return 0; } +static void free_trace_buffer(struct trace_buffer *buf) +{ + if (buf->buffer) { + ring_buffer_free(buf->buffer); + buf->buffer = NULL; + free_percpu(buf->data); + buf->data = NULL; + } +} + static void free_trace_buffers(struct trace_array *tr) { if (!tr) return; - if (tr->trace_buffer.buffer) { - ring_buffer_free(tr->trace_buffer.buffer); - tr->trace_buffer.buffer = NULL; - free_percpu(tr->trace_buffer.data); - } + free_trace_buffer(&tr->trace_buffer); #ifdef CONFIG_TRACER_MAX_TRACE - if (tr->max_buffer.buffer) { - ring_buffer_free(tr->max_buffer.buffer); - tr->max_buffer.buffer = NULL; - } + free_trace_buffer(&tr->max_buffer); #endif }