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block: reorder struct bio to remove padding on 64bit 

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@rsk.demon.co.uk>
Signed-off-by: Jens Axboe <jens.axboe@oracle.com>
This commit is contained in:
Richard Kennedy 2008-12-03 12:41:40 +01:00 committed by Jens Axboe
parent 64d01dc9e1
commit ba744d5e29
1 changed files with 2 additions and 1 deletions
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3
include/linux/bio.h
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@ -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)