diff options
Diffstat (limited to 'kernel/trace/trace.c')
| -rw-r--r-- | kernel/trace/trace.c | 20 |
1 files changed, 20 insertions, 0 deletions
diff --git a/kernel/trace/trace.c b/kernel/trace/trace.c index 0c1dc1850858..35ee63ae4122 100644 --- a/kernel/trace/trace.c +++ b/kernel/trace/trace.c @@ -2357,6 +2357,26 @@ static int tracing_resize_ring_buffer(unsigned long size) return ret; } +/** + * tracing_update_buffers - used by tracing facility to expand ring buffers + * + * To save on memory when the tracing is never used on a system with it + * configured in. The ring buffers are set to a minimum size. But once + * a user starts to use the tracing facility, then they need to grow + * to their default size. + * + * This function is to be called when a tracer is about to be used. + */ +int tracing_update_buffers(void) +{ + int ret = 0; + + if (!ring_buffer_expanded) + ret = tracing_resize_ring_buffer(trace_buf_size); + + return ret; +} + struct trace_option_dentry; static struct trace_option_dentry * |