This is a note to let you know that I've just added the patch titled
block: unalign call_single_data in struct request
to the 4.14-stable tree which can be found at: http://www.kernel.org/git/?p=linux/kernel/git/stable/stable-queue.git%3Ba=su...
The filename of the patch is: block-unalign-call_single_data-in-struct-request.patch and it can be found in the queue-4.14 subdirectory.
If you, or anyone else, feels it should not be added to the stable tree, please let stable@vger.kernel.org know about it.
From 4ccafe032005e9b96acbef2e389a4de5b1254add Mon Sep 17 00:00:00 2001
From: Jens Axboe axboe@kernel.dk Date: Wed, 20 Dec 2017 13:13:58 -0700 Subject: block: unalign call_single_data in struct request
From: Jens Axboe axboe@kernel.dk
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
--- include/linux/blkdev.h | 2 +- 1 file changed, 1 insertion(+), 1 deletion(-)
--- a/include/linux/blkdev.h +++ b/include/linux/blkdev.h @@ -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; };
Patches currently in stable-queue which might be from axboe@kernel.dk are
queue-4.14/block-unalign-call_single_data-in-struct-request.patch queue-4.14/block-throttle-avoid-double-charge.patch