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tracing: Fix leak of per cpu max data in instances

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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 <namhyung@gmail.com>
Signed-off-by: Steven Rostedt <rostedt@goodmis.org>
This commit is contained in:
Steven Rostedt (Red Hat) 2014-06-10 12:06:30 -04:00 committed by Steven Rostedt
parent a6af8fbf17
commit f0b70cc48c
1 changed files with 12 additions and 9 deletions
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21
kernel/trace/trace.c
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@ -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
}