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block: remove 16 bytes of padding from struct request on 64bits

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Remove alignment padding to shrink struct request from 336 to 320 bytes
so needing one fewer cacheline and therefore removing 48 bytes from
struct request_queue.

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 2010-03-19 08:58:16 +01:00 committed by Jens Axboe
parent b4b7a4ef09
commit 181fdde3b4
1 changed files with 6 additions and 5 deletions
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11
include/linux/blkdev.h
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@ -158,7 +158,6 @@ enum rq_flag_bits {
struct request {
struct list_head queuelist;
struct call_single_data csd;
int cpu;
struct request_queue *q;
@ -166,9 +165,11 @@ struct request {
enum rq_cmd_type_bits cmd_type;
unsigned long atomic_flags;
int cpu;
/* the following two fields are internal, NEVER access directly */
sector_t __sector; /* sector cursor */
unsigned int __data_len; /* total data len */
sector_t __sector; /* sector cursor */
struct bio *bio;
struct bio *biotail;
@ -201,20 +202,20 @@ struct request {
unsigned short ioprio;
int ref_count;
void *special; /* opaque pointer available for LLD use */
char *buffer; /* kaddr of the current segment if available */
int tag;
int errors;
int ref_count;
/*
* when request is used as a packet command carrier
*/
unsigned short cmd_len;
unsigned char __cmd[BLK_MAX_CDB];
unsigned char *cmd;
unsigned short cmd_len;
unsigned int extra_len; /* length of alignment and padding */
unsigned int sense_len;