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| author | Christoph Hellwig <hch@lst.de> | 2020-09-24 08:51:37 +0200 |
|---|---|---|
| committer | Jens Axboe <axboe@kernel.dk> | 2020-09-24 13:43:39 -0600 |
| commit | 5115db10a8e0a525edf8a65b2ed4eac5c8253095 (patch) | |
| tree | 664bad791aaeda55fbd96229a0977943dc36fb5a /mm/page_io.c | |
| parent | a8b456d01cd6b37191f14248f3e2bdbe5ce3a89e (diff) | |
| download | linux-stable-5115db10a8e0a525edf8a65b2ed4eac5c8253095.tar.gz linux-stable-5115db10a8e0a525edf8a65b2ed4eac5c8253095.tar.bz2 linux-stable-5115db10a8e0a525edf8a65b2ed4eac5c8253095.zip | |
mm: use SWP_SYNCHRONOUS_IO more intelligently
There is no point in trying to call bdev_read_page if SWP_SYNCHRONOUS_IO
is not set, as the device won't support it.
Signed-off-by: Christoph Hellwig <hch@lst.de>
Reviewed-by: Jan Kara <jack@suse.cz>
Reviewed-by: Johannes Thumshirn <johannes.thumshirn@wdc.com>
Signed-off-by: Jens Axboe <axboe@kernel.dk>
Diffstat (limited to 'mm/page_io.c')
| -rw-r--r-- | mm/page_io.c | 18 |
1 files changed, 10 insertions, 8 deletions
diff --git a/mm/page_io.c b/mm/page_io.c index e485a6e8a6cd..b199b87e0aa9 100644 --- a/mm/page_io.c +++ b/mm/page_io.c @@ -403,15 +403,17 @@ int swap_readpage(struct page *page, bool synchronous) goto out; } - ret = bdev_read_page(sis->bdev, swap_page_sector(page), page); - if (!ret) { - if (trylock_page(page)) { - swap_slot_free_notify(page); - unlock_page(page); - } + if (sis->flags & SWP_SYNCHRONOUS_IO) { + ret = bdev_read_page(sis->bdev, swap_page_sector(page), page); + if (!ret) { + if (trylock_page(page)) { + swap_slot_free_notify(page); + unlock_page(page); + } - count_vm_event(PSWPIN); - goto out; + count_vm_event(PSWPIN); + goto out; + } } ret = 0; |