The patch titled
Subject: mm, swap: introduce SWP_SYNCHRONOUS_IO
has been added to the -mm tree. Its filename is
mm-swap-introduce-swp_synchronous_io.patch
This patch should soon appear at
http://ozlabs.org/~akpm/mmots/broken-out/mm-swap-introduce-swp_synchronous_io.patch
and later at
http://ozlabs.org/~akpm/mmotm/broken-out/mm-swap-introduce-swp_synchronous_io.patch
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------------------------------------------------------
From: Minchan Kim <minchan@xxxxxxxxxx>
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@xxxxxxxxxx
Signed-off-by: Minchan Kim <minchan@xxxxxxxxxx>
Cc: Hugh Dickins <hughd@xxxxxxxxxx>
Cc: Christoph Hellwig <hch@xxxxxx>
Cc: Dan Williams <dan.j.williams@xxxxxxxxx>
Cc: Ilya Dryomov <idryomov@xxxxxxxxx>
Cc: Jens Axboe <axboe@xxxxxxxxx>
Cc: Ross Zwisler <ross.zwisler@xxxxxxxxxxxxxxx>
Cc: Sergey Senozhatsky <sergey.senozhatsky@xxxxxxxxx>
Signed-off-by: Andrew Morton <akpm@xxxxxxxxxxxxxxxxxxxx>
---
include/linux/swap.h | 3 ++-
mm/swapfile.c | 3 +++
2 files changed, 5 insertions(+), 1 deletion(-)
diff -puN include/linux/swap.h~mm-swap-introduce-swp_synchronous_io include/linux/swap.h
--- a/include/linux/swap.h~mm-swap-introduce-swp_synchronous_io
+++ a/include/linux/swap.h
@@ -170,8 +170,9 @@ enum {
SWP_AREA_DISCARD = (1 << 8), /* single-time swap area discards */
SWP_PAGE_DISCARD = (1 << 9), /* freed swap page-cluster discards */
SWP_STABLE_WRITES = (1 << 10), /* no overwrite PG_writeback pages */
+ SWP_SYNCHRONOUS_IO = (1 << 11), /* synchronous IO is efficient */
/* add others here before... */
- SWP_SCANNING = (1 << 11), /* refcount in scan_swap_map */
+ SWP_SCANNING = (1 << 12), /* refcount in scan_swap_map */
};
#define SWAP_CLUSTER_MAX 32UL
diff -puN mm/swapfile.c~mm-swap-introduce-swp_synchronous_io mm/swapfile.c
--- a/mm/swapfile.c~mm-swap-introduce-swp_synchronous_io
+++ a/mm/swapfile.c
@@ -3168,6 +3168,9 @@ SYSCALL_DEFINE2(swapon, const char __use
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;
_
Patches currently in -mm which might be from minchan@xxxxxxxxxx are
zram-fix-null-dereference-of-handle.patch
zram-fix-null-dereference-of-handle-v2.patch
zram-set-bdi_cap_stable_writes-once.patch
bdi-introduce-bdi_cap_synchronous_io.patch
mm-swap-introduce-swp_synchronous_io.patch
mm-swap-skip-swapcache-for-swapin-of-synchronous-device.patch
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