The patch titled
block: reorder struct bio to remove padding on 64bit
has been added to the -mm tree. Its filename is
block-reorder-struct-bio-to-remove-padding-on-64bit.patch
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------------------------------------------------------
Subject: block: reorder struct bio to remove padding on 64bit
From: Richard Kennedy <richard@xxxxxxxxxxxxxxx>
Remove 8 bytes of padding from struct bio which also removes 16 bytes from
struct bio_pair to make it 248 bytes. bio_pair then fits into one fewer
cache lines & into a smaller slab.
Signed-off-by: Richard Kennedy <richard@xxxxxxxxxxxxxxx>
Cc: Jens Axboe <jens.axboe@xxxxxxxxxx>
Signed-off-by: Andrew Morton <akpm@xxxxxxxxxxxxxxxxxxxx>
---
include/linux/bio.h | 3 ++-
1 file changed, 2 insertions(+), 1 deletion(-)
diff -puN include/linux/bio.h~block-reorder-struct-bio-to-remove-padding-on-64bit include/linux/bio.h
--- a/include/linux/bio.h~block-reorder-struct-bio-to-remove-padding-on-64bit
+++ a/include/linux/bio.h
@@ -90,10 +90,11 @@ struct bio {
unsigned int bi_comp_cpu; /* completion CPU */
+ atomic_t bi_cnt; /* pin count */
+
struct bio_vec *bi_io_vec; /* the actual vec list */
bio_end_io_t *bi_end_io;
- atomic_t bi_cnt; /* pin count */
void *bi_private;
#if defined(CONFIG_BLK_DEV_INTEGRITY)
_
Patches currently in -mm which might be from richard@xxxxxxxxxxxxxxx are
linux-next.patch
block-reorder-struct-bio-to-remove-padding-on-64bit.patch
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