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block: unalign call_single_data in struct request

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commit 4ccafe032005e9b96acbef2e389a4de5b1254add upstream.

A previous change blindly added massive alignment to the
call_single_data structure in struct request. This ballooned it in size
from 296 to 320 bytes on my setup, for no valid reason at all.

Use the unaligned struct __call_single_data variant instead.

Fixes: 966a967116e69 ("smp: Avoid using two cache lines for struct call_single_data")
Signed-off-by: Jens Axboe <axboe@kernel.dk>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
This commit is contained in:
Jens Axboe 2017-12-20 13:13:58 -07:00 committed by Greg Kroah-Hartman
parent d8f477a5cd
commit f349652293
1 changed files with 1 additions and 1 deletions
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include/linux/blkdev.h
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@ -135,7 +135,7 @@ typedef __u32 __bitwise req_flags_t;
struct request {
struct list_head queuelist;
union {
call_single_data_t csd;
struct __call_single_data csd;
u64 fifo_time;
};