linux-kernel - [PATCH 11/14] mm: use SWP_SYNCHRONOUS

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Message-Id: <20200720075148.172156-12-hch@lst.de>
Date:   Mon, 20 Jul 2020 09:51:45 +0200
From:   Christoph Hellwig <hch@....de>
To:     Jens Axboe <axboe@...nel.dk>
Cc:     Song Liu <song@...nel.org>, Hans de Goede <hdegoede@...hat.com>,
        Richard Weinberger <richard@....at>,
        linux-mtd@...ts.infradead.org, dm-devel@...hat.com,
        linux-block@...r.kernel.org, linux-kernel@...r.kernel.org,
        drbd-dev@...ts.linbit.com, linux-raid@...r.kernel.org,
        linux-fsdevel@...r.kernel.org, linux-mm@...ck.org,
        cgroups@...r.kernel.org
Subject: [PATCH 11/14] 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.  Also there is no point in
trying a bio submission if bdev_read_page failed.

Signed-off-by: Christoph Hellwig <hch@....de>
---
 mm/page_io.c | 7 +++++--
 1 file changed, 5 insertions(+), 2 deletions(-)

diff --git a/mm/page_io.c b/mm/page_io.c
index ccda7679008851..63b44b8221af0f 100644
--- a/mm/page_io.c
+++ b/mm/page_io.c
@@ -403,8 +403,11 @@ int swap_readpage(struct page *page, bool synchronous)
 		goto out;
 	}
 
-	ret = bdev_read_page(sis->bdev, swap_page_sector(page), page);
-	if (!ret) {
+	if (sis->flags & SWP_SYNCHRONOUS_IO) {
+		ret = bdev_read_page(sis->bdev, swap_page_sector(page), page);
+		if (ret)
+			goto out;
+
 		if (trylock_page(page)) {
 			swap_slot_free_notify(page);
 			unlock_page(page);
-- 
2.27.0