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From: Jens Axboe <axboe@kernel.dk>
To: linux-fsdevel@vger.kernel.org
Cc: viro@zeniv.linux.org.uk, akpm@linux-foundation.org
Subject: [PATCHSET v3 0/4] Submit ->readpages() IO as read-ahead
Date: Wed, 30 May 2018 08:42:05 -0600	[thread overview]
Message-ID: <1527691329-2371-1-git-send-email-axboe@kernel.dk> (raw)

The only caller of ->readpages() is from read-ahead, yet we don't
submit IO flagged with REQ_RAHEAD. This means we don't see it in
blktrace, for instance, which is a shame. We already make assumptions
about ->readpages() just being for read-ahead in the mpage
implementation, using readahead_gfp_mask(mapping) as out GFP mask of
choice.

This small series fixes up mpage_readpages() to submit with
REQ_RAHEAD, which takes care of file systems using mpage_readpages().
The first patch is a prep patch, that makes do_mpage_readpage() take
an argument structure.

Changes since v2:

- Get rid of 'gfp' passing once we have is_readahead
- Pack struct better, makes it 8 bytes smaller.

Changes since v1:

- Fix ext4_mpage_readpages() also being used for regular reads
- Add prep patch with struct arguments for do_mpage_readpage()

 fs/btrfs/extent_io.c |   2 +-
 fs/ext4/ext4.h       |   2 +-
 fs/ext4/inode.c      |   5 +-
 fs/ext4/readpage.c   |   5 +-
 fs/mpage.c           | 115 ++++++++++++++++++++++++-------------------
 5 files changed, 71 insertions(+), 58 deletions(-)

             reply	other threads:[~2018-05-30 14:42 UTC|newest]

Thread overview: 16+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2018-05-30 14:42 Jens Axboe [this message]
2018-05-30 14:42 ` [PATCH 1/4] mpage: add argument structure for do_mpage_readpage() Jens Axboe
2018-05-30 14:42 ` [PATCH 2/4] mpage: mpage_readpages() should submit IO as read-ahead Jens Axboe
2018-05-30 14:42 ` [PATCH 3/4] btrfs: readpages() " Jens Axboe
2018-05-30 14:42 ` [PATCH 4/4] ext4: " Jens Axboe
2018-06-19 23:56 ` [PATCHSET v3 0/4] Submit ->readpages() " Andrew Morton
2018-06-20 14:07   ` Jens Axboe
2018-06-20 19:58     ` Andrew Morton
2018-06-20 20:15       ` Chris Mason
2018-06-20 22:28       ` Jens Axboe
2018-06-20 23:23         ` Andrew Morton
2018-06-20 23:33           ` Jens Axboe
2018-06-20 23:45             ` Andrew Morton
2018-06-21  0:06               ` Jens Axboe
2018-06-21 12:21         ` Christoph Hellwig
2018-06-21 13:52           ` Jens Axboe

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