linux-kernel - [RFC PATCH 0/7] mm: Make more use of readahead

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Date:   Tue, 01 Sep 2020 17:28:15 +0100
From:   David Howells <dhowells@...hat.com>
To:     willy@...radead.org
Cc:     dhowells@...hat.com, linux-fsdevel@...r.kernel.org,
        linux-mm@...ck.org, linux-kernel@...r.kernel.org
Subject: [RFC PATCH 0/7] mm: Make more use of readahead_control


Hi Willy,

Here's a set of patches to expand the use of the readahead_control struct,
essentially from do_sync_mmap_readahead() down.  Note that I've been
passing the number of pages to read in rac->_nr_pages, and then saving it
and changing it certain points, e.g. page_cache_readahead_unbounded().

Also pass file_ra_state into force_page_cache_readahead().

Also there's an apparent minor bug in khugepaged.c that I've included a
patch for: page_cache_sync_readahead() looks to be given the wrong size in
collapse_file().

David
---
David Howells (7):
      Fix khugepaged's request size in collapse_file()
      mm: Make ondemand_readahead() take a readahead_control struct
      mm: Push readahead_control down into force_page_cache_readahead()
      mm: Pass readahead_control into page_cache_{sync,async}_readahead()
      mm: Make __do_page_cache_readahead() use rac->_nr_pages
      mm: Fold ra_submit() into do_sync_mmap_readahead()
      mm: Pass a file_ra_state struct into force_page_cache_readahead()


 fs/btrfs/free-space-cache.c |  7 +--
 fs/btrfs/ioctl.c            | 10 +++--
 fs/btrfs/relocation.c       | 14 +++---
 fs/btrfs/send.c             | 15 ++++---
 fs/ext4/dir.c               | 12 ++---
 fs/ext4/verity.c            |  8 ++--
 fs/f2fs/dir.c               | 10 +++--
 fs/f2fs/verity.c            |  8 ++--
 include/linux/pagemap.h     | 11 ++---
 mm/fadvise.c                |  6 ++-
 mm/filemap.c                | 33 +++++++-------
 mm/internal.h               | 16 +------
 mm/khugepaged.c             |  6 +--
 mm/readahead.c              | 89 ++++++++++++++++++-------------------
 14 files changed, 127 insertions(+), 118 deletions(-)