From: Christoph Hellwig <hch@lst.de>
To: Jens Axboe <axboe@kernel.dk>
Cc: Song Liu <song@kernel.org>, Hans de Goede <hdegoede@redhat.com>,
Coly Li <colyli@suse.de>, Richard Weinberger <richard@nod.at>,
Minchan Kim <minchan@kernel.org>,
Johannes Thumshirn <Johannes.Thumshirn@wdc.com>,
Justin Sanders <justin@coraid.com>,
linux-mtd@lists.infradead.org, dm-devel@redhat.com,
linux-block@vger.kernel.org, linux-bcache@vger.kernel.org,
linux-kernel@vger.kernel.org, drbd-dev@lists.linbit.com,
linux-raid@vger.kernel.org, linux-fsdevel@vger.kernel.org,
linux-mm@kvack.org, cgroups@vger.kernel.org,
Jan Kara <jack@suse.cz>,
Johannes Thumshirn <johannes.thumshirn@wdc.com>
Subject: [PATCH 10/13] mm: use SWP_SYNCHRONOUS_IO more intelligently
Date: Thu, 24 Sep 2020 08:51:37 +0200 [thread overview]
Message-ID: <20200924065140.726436-11-hch@lst.de> (raw)
In-Reply-To: <20200924065140.726436-1-hch@lst.de>
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>
---
mm/page_io.c | 18 ++++++++++--------
1 file changed, 10 insertions(+), 8 deletions(-)
diff --git a/mm/page_io.c b/mm/page_io.c
index e485a6e8a6cddb..b199b87e0aa92b 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;
--
2.28.0
next prev parent reply other threads:[~2020-09-24 6:53 UTC|newest]
Thread overview: 22+ messages / expand[flat|nested] mbox.gz Atom feed top
2020-09-24 6:51 bdi cleanups v7 Christoph Hellwig
2020-09-24 6:51 ` [PATCH 01/13] fs: remove the unused SB_I_MULTIROOT flag Christoph Hellwig
2020-09-24 6:51 ` [PATCH 02/13] drbd: remove dead code in device_to_statistics Christoph Hellwig
2020-09-24 6:51 ` [PATCH 03/13] bcache: inherit the optimal I/O size Christoph Hellwig
2020-09-24 15:49 ` Martin K. Petersen
2020-09-24 6:51 ` [PATCH 04/13] aoe: set an " Christoph Hellwig
2020-09-24 15:51 ` Martin K. Petersen
2020-09-24 6:51 ` [PATCH 05/13] bdi: initialize ->ra_pages and ->io_pages in bdi_init Christoph Hellwig
2020-09-24 6:51 ` [PATCH 06/13] md: update the optimal I/O size on reshape Christoph Hellwig
2020-09-24 15:53 ` Martin K. Petersen
2020-09-24 6:51 ` [PATCH 07/13] block: lift setting the readahead size into the block layer Christoph Hellwig
2020-09-24 14:53 ` Jan Kara
2020-09-24 15:03 ` Mike Snitzer
2020-09-24 15:57 ` Martin K. Petersen
2020-09-24 6:51 ` [PATCH 08/13] bdi: remove BDI_CAP_CGROUP_WRITEBACK Christoph Hellwig
2020-09-24 6:51 ` [PATCH 09/13] bdi: remove BDI_CAP_SYNCHRONOUS_IO Christoph Hellwig
2020-09-24 6:51 ` Christoph Hellwig [this message]
2020-09-24 6:51 ` [PATCH 11/13] bdi: replace BDI_CAP_STABLE_WRITES with a queue and a sb flag Christoph Hellwig
2020-09-24 6:51 ` [PATCH 12/13] bdi: invert BDI_CAP_NO_ACCT_WB Christoph Hellwig
2020-09-24 6:51 ` [PATCH 13/13] bdi: replace BDI_CAP_NO_{WRITEBACK,ACCT_DIRTY} with a single flag Christoph Hellwig
2020-09-24 19:44 ` bdi cleanups v7 Jens Axboe
-- strict thread matches above, loose matches on Subject: below --
2020-09-21 8:07 bdi cleanups v6 Christoph Hellwig
2020-09-21 8:07 ` [PATCH 10/13] mm: use SWP_SYNCHRONOUS_IO more intelligently Christoph Hellwig
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