trace: Reorder struct ring_buffer_per_cpu to remove padding on 64bit

Reorder structure to remove 8 bytes of padding on 64 bit builds.
This shrinks the size to 128 bytes so allowing allocation from a smaller
slab & needed one fewer cache lines.

Signed-off-by: Richard Kennedy <richard@rsk.demon.co.uk>
LKML-Reference: <1269516456.2054.8.camel@localhost>
Signed-off-by: Steven Rostedt <rostedt@goodmis.org>

diff --git a/kernel/trace/ring_buffer.c b/kernel/trace/ring_buffer.c
index 28d0615..3632ce8 100644 (file)
--- a/kernel/trace/ring_buffer.c
+++ b/kernel/trace/ring_buffer.c
@@ -443,6 +443,7 @@ int ring_buffer_print_page_header(struct trace_seq *s)
  */
 struct ring_buffer_per_cpu {
        int                             cpu;
+       atomic_t                        record_disabled;
        struct ring_buffer              *buffer;
        spinlock_t                      reader_lock;    /* serialize readers */
        arch_spinlock_t                 lock;
@@ -462,7 +463,6 @@ struct ring_buffer_per_cpu {
        unsigned long                   read;
        u64                             write_stamp;
        u64                             read_stamp;
-       atomic_t                        record_disabled;
 };
 
 struct ring_buffer {