cfq: reorder cfq_queue removing padding on 64bit

This removes 8 bytes of padding from struct cfq_queue on 64 bit builds,
shrinking it's size to 256 bytes, so fitting into 1 fewer cachelines and
allowing 1 more object/slab in it's kmem_cache.

Signed-off-by: Richard Kennedy <richard@rsk.demon.co.uk>
Reviewed-by: Jeff Moyer <jmoyer@redhat.com>
----
patch against 2.6.33-rc8
tested on x86_64 AMDX2
Signed-off-by: Jens Axboe <jens.axboe@oracle.com>

1 files changed, 3 insertions, 3 deletions

diff --git a/block/cfq-iosched.c b/block/cfq-iosched.c
index 023f4e69a337..e3dedfd3bcb4 100644
--- a/block/cfq-iosched.c
+++ b/block/cfq-iosched.c
@@ -115,11 +115,11 @@ struct cfq_queue {
         /* time when queue got scheduled in to dispatch first request. */
         unsigned long dispatch_start;
         unsigned int allocated_slice;
+        unsigned int slice_dispatch;
         /* time when first request from queue completed and slice started. */
         unsigned long slice_start;
         unsigned long slice_end;
         long slice_resid;
-        unsigned int slice_dispatch;
 
         /* pending metadata requests */
         int meta_pending;
@@ -130,13 +130,13 @@ struct cfq_queue {
         unsigned short ioprio, org_ioprio;
         unsigned short ioprio_class, org_ioprio_class;
 
+        pid_t pid;
+
         unsigned int seek_samples;
         u64 seek_total;
         sector_t seek_mean;
         sector_t last_request_pos;
 
-        pid_t pid;
-
         struct cfq_rb_root *service_tree;
         struct cfq_queue *new_cfqq;
         struct cfq_group *cfqg;