From 539a6fea7fdcade532bd3e77be2862a683f8f0c9 Mon Sep 17 00:00:00 2001 From: Minchan Kim Date: Wed, 15 Nov 2017 17:33:04 -0800 Subject: mm, swap: introduce SWP_SYNCHRONOUS_IO If rw-page based fast storage is used for swap devices, we need to detect it to enhance swap IO operations. This patch is preparation for optimizing of swap-in operation with next patch. Link: http://lkml.kernel.org/r/1505886205-9671-4-git-send-email-minchan@kernel.org Signed-off-by: Minchan Kim Cc: Hugh Dickins Cc: Christoph Hellwig Cc: Dan Williams Cc: Ilya Dryomov Cc: Jens Axboe Cc: Ross Zwisler Cc: Sergey Senozhatsky Cc: Huang Ying Signed-off-by: Andrew Morton Signed-off-by: Linus Torvalds --- mm/swapfile.c | 3 +++ 1 file changed, 3 insertions(+) (limited to 'mm/swapfile.c') diff --git a/mm/swapfile.c b/mm/swapfile.c index e47a21e64764..cb08fa65819f 100644 --- a/mm/swapfile.c +++ b/mm/swapfile.c @@ -3169,6 +3169,9 @@ SYSCALL_DEFINE2(swapon, const char __user *, specialfile, int, swap_flags) if (bdi_cap_stable_pages_required(inode_to_bdi(inode))) p->flags |= SWP_STABLE_WRITES; + if (bdi_cap_synchronous_io(inode_to_bdi(inode))) + p->flags |= SWP_SYNCHRONOUS_IO; + if (p->bdev && blk_queue_nonrot(bdev_get_queue(p->bdev))) { int cpu; unsigned long ci, nr_cluster; -- cgit v1.2.3