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From: Shakeel Butt <shakeelb@google.com>
To: Christoph Hellwig <hch@lst.de>
Cc: Jens Axboe <axboe@kernel.dk>,
	linux-raid@vger.kernel.org, Hans de Goede <hdegoede@redhat.com>,
	Minchan Kim <minchan@kernel.org>,
	Richard Weinberger <richard@nod.at>,
	LKML <linux-kernel@vger.kernel.org>,
	"open list:BLOCK LAYER" <linux-block@vger.kernel.org>,
	Song Liu <song@kernel.org>,
	dm-devel@redhat.com, linux-mtd@lists.infradead.org,
	linux-fsdevel <linux-fsdevel@vger.kernel.org>,
	Cgroups <cgroups@vger.kernel.org>, Linux MM <linux-mm@kvack.org>,
	drbd-dev@lists.linbit.com
Subject: Re: [PATCH 11/14] mm: use SWP_SYNCHRONOUS_IO more intelligently
Date: Wed, 22 Jul 2020 09:26:45 -0700
Message-ID: <CALvZod6zF7Ak8KWf4dq0pEF2ty7JN_SyNE7PxLjrfF+EuDbZ2w@mail.gmail.com> (raw)
In-Reply-To: <20200722062552.212200-12-hch@lst.de>

On Tue, Jul 21, 2020 at 11:27 PM Christoph Hellwig <hch@lst.de> wrote:
>
> 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>
> ---
>  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 ccda7679008851..442061348dfb26 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) {

!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;
> --
> 2.27.0
>

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Thread overview: 35+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2020-07-22  6:25 bdi cleanups v2 Christoph Hellwig
2020-07-22  6:25 ` [PATCH 01/14] fs: remove the unused SB_I_MULTIROOT flag Christoph Hellwig
2020-07-22  6:54   ` Johannes Thumshirn
2020-07-22  6:25 ` [PATCH 02/14] drbd: remove dead code in device_to_statistics Christoph Hellwig
2020-07-22  7:03   ` Johannes Thumshirn
2020-07-22  7:07     ` Christoph Hellwig
2020-07-22  7:14       ` Johannes Thumshirn
2020-07-22  6:25 ` [PATCH 03/14] drbd: remove RB_CONGESTED_REMOTE Christoph Hellwig
2020-07-22  7:06   ` Johannes Thumshirn
2020-07-22  6:25 ` [PATCH 04/14] bdi: initialize ->ra_pages in bdi_init Christoph Hellwig
2020-07-22  9:04   ` David Sterba
2020-07-22 11:15   ` Richard Weinberger
2020-07-22  6:25 ` [PATCH 05/14] md: update the optimal I/O size on reshape Christoph Hellwig
2020-07-22  6:25 ` [PATCH 06/14] block: lift setting the readahead size into the block layer Christoph Hellwig
2020-07-22  7:13   ` Johannes Thumshirn
2020-07-22  7:18     ` Christoph Hellwig
2020-07-22  6:25 ` [PATCH 07/14] block: make QUEUE_SYSFS_BIT_FNS a little more useful Christoph Hellwig
2020-07-22  7:17   ` Johannes Thumshirn
2020-07-22  6:25 ` [PATCH 08/14] block: add helper macros for queue sysfs entries Christoph Hellwig
2020-07-22  7:20   ` Johannes Thumshirn
2020-07-22  6:25 ` [PATCH 09/14] bdi: remove BDI_CAP_CGROUP_WRITEBACK Christoph Hellwig
2020-07-22  7:45   ` Johannes Thumshirn
2020-07-26  9:01     ` Wols Lists
2020-07-22  6:25 ` [PATCH 10/14] bdi: remove BDI_CAP_SYNCHRONOUS_IO Christoph Hellwig
2020-07-22  6:25 ` [PATCH 11/14] mm: use SWP_SYNCHRONOUS_IO more intelligently Christoph Hellwig
2020-07-22 16:26   ` Shakeel Butt [this message]
2020-07-22  6:25 ` [PATCH 12/14] bdi: replace BDI_CAP_STABLE_WRITES with a queue and a sb flag Christoph Hellwig
2020-07-22  6:25 ` [PATCH 13/14] bdi: invert BDI_CAP_NO_ACCT_WB Christoph Hellwig
2020-07-22  6:25 ` [PATCH 14/14] bdi: replace BDI_CAP_NO_{WRITEBACK, ACCT_DIRTY} with a single flag Christoph Hellwig
  -- strict thread matches above, loose matches on Subject: below --
2020-07-26 15:03 bdi cleanups v3 Christoph Hellwig
2020-07-26 15:03 ` [PATCH 11/14] mm: use SWP_SYNCHRONOUS_IO more intelligently Christoph Hellwig
2020-07-24  7:32 bdi cleanups v3 Christoph Hellwig
2020-07-24  7:33 ` [PATCH 11/14] mm: use SWP_SYNCHRONOUS_IO more intelligently Christoph Hellwig
2020-07-28 12:28   ` Johannes Thumshirn
2020-07-20  7:51 bdi cleanups Christoph Hellwig
2020-07-20  7:51 ` [PATCH 11/14] mm: use SWP_SYNCHRONOUS_IO more intelligently Christoph Hellwig
2020-07-20 17:52   ` Shakeel Butt
2020-07-21  5:46     ` Minchan Kim

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