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block, THP: make block_device_operations.rw_page support THP

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The .rw_page in struct block_device_operations is used by the swap
subsystem to read/write the page contents from/into the corresponding
swap slot in the swap device.  To support the THP (Transparent Huge
Page) swap optimization, the .rw_page is enhanced to support to
read/write THP if possible.

Link: http://lkml.kernel.org/r/20170724051840.2309-6-ying.huang@intel.com
Signed-off-by: "Huang, Ying" <ying.huang@intel.com>
Reviewed-by: Ross Zwisler <ross.zwisler@intel.com> [for brd.c, zram_drv.c, pmem.c]
Cc: Johannes Weiner <hannes@cmpxchg.org>
Cc: Minchan Kim <minchan@kernel.org>
Cc: Dan Williams <dan.j.williams@intel.com>
Cc: Vishal L Verma <vishal.l.verma@intel.com>
Cc: Jens Axboe <axboe@kernel.dk>
Cc: "Kirill A . Shutemov" <kirill.shutemov@linux.intel.com>
Cc: Andrea Arcangeli <aarcange@redhat.com>
Cc: Hugh Dickins <hughd@google.com>
Cc: Michal Hocko <mhocko@kernel.org>
Cc: Rik van Riel <riel@redhat.com>
Cc: Shaohua Li <shli@kernel.org>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
This commit is contained in:
Huang Ying
2017-09-06 16:22:27 -07:00
committed by Linus Torvalds
parent f0eea189e8
commit 98cc093cba
4 changed files with 38 additions and 11 deletions
Download Patch File Download Diff File Expand all files Collapse all files
drivers/block/brd.c
+5 -1
View File
@@ -326,7 +326,11 @@ static int brd_rw_page(struct block_device *bdev, sector_t sector,
struct page *page, bool is_write)
{
struct brd_device *brd = bdev->bd_disk->private_data;
int err = brd_do_bvec(brd, page, PAGE_SIZE, 0, is_write, sector);
int err;
if (PageTransHuge(page))
return -ENOTSUPP;
err = brd_do_bvec(brd, page, PAGE_SIZE, 0, is_write, sector);
page_endio(page, is_write, err);
return err;
}