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Subject[PATCH] cfq: remove 8 bytes of padding from cfq_rb_root on 64 bit builds
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Reorder cfq_rb_root to remove 8 bytes of padding on 64 bit builds.


Consequently removing 56 bytes from cfq_group and 64 bytes from
cfq_data.


Signed-off-by: Richard Kennedy <richard@rsk.demon.co.uk>

---
patch against 2.6.33
compiled & tested on x86_64 AMD-X2

regards
Richard

diff --git a/block/cfq-iosched.c b/block/cfq-iosched.c
index e3dedfd..daff53d 100644
--- a/block/cfq-iosched.c
+++ b/block/cfq-iosched.c
@@ -77,11 +77,12 @@ struct cfq_rb_root {
struct rb_root rb;
struct rb_node *left;
unsigned count;
+ unsigned total_weight;
u64 min_vdisktime;
struct rb_node *active;
- unsigned total_weight;
};
-#define CFQ_RB_ROOT (struct cfq_rb_root) { RB_ROOT, NULL, 0, 0, }
+#define CFQ_RB_ROOT (struct cfq_rb_root) { .rb = RB_ROOT, .left = NULL, \
+ .count = 0, .min_vdisktime = 0, }

/*
* Per process-grouping structure



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