linux-kernel - Re: [PATCH 0/7] Overhaul find_get_entries and pagevec_lookup

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Message-Id: <F3875B5A-52FF-41B8-8F57-2F25659949D6@oracle.com>
Date:   Fri, 21 Aug 2020 20:34:38 -0600
From:   William Kucharski <william.kucharski@...cle.com>
To:     "Matthew Wilcox (Oracle)" <willy@...radead.org>
Cc:     linux-mm <linux-mm@...ck.org>,
        Andrew Morton <akpm@...ux-foundation.org>,
        Hugh Dickins <hughd@...gle.com>,
        Johannes Weiner <hannes@...xchg.org>, Jan Kara <jack@...e.cz>,
        linux-kernel@...r.kernel.org
Subject: Re: [PATCH 0/7] Overhaul find_get_entries and pagevec_lookup_entries



> On Aug 19, 2020, at 9:05 AM, Matthew Wilcox (Oracle) <willy@...radead.org> wrote:
> 
> This started out as part of the THP patchset, but it's turned into a
> nice simplification in its own right.  Essentially we end up unifying
> find_get_entries() and pagevec_lookup_entries() into one function that's
> better than either, and we get rid of a lot of code in the callers as
> a result.
> 
> I'm running this through xfstests right now, but something similar to
> this has already passed xfstests as part of the THP patchset.
> 
> I've done my best to avoid off-by-one errors for 'end', but I wouldn't be
> surprised if I made a mistake.  We're not consistent with whether 'end'
> is inclusive or exclusive and I didn't want to make extensive changes
> to ensure they were consistent.
> 
> Matthew Wilcox (Oracle) (7):
>  mm: Use pagevec_lookup in shmem_unlock_mapping
>  mm: Rewrite shmem_seek_hole_data
>  mm: Add an 'end' parameter to find_get_entries
>  mm: Add an 'end' parameter to pagevec_lookup_entries
>  mm: Remove nr_entries parameter from pagevec_lookup_entries
>  mm: Pass pvec directly to find_get_entries
>  mm: Remove pagevec_lookup_entries
> 
> include/linux/pagemap.h |  3 +-
> include/linux/pagevec.h |  4 --
> mm/filemap.c            | 19 +++++----
> mm/shmem.c              | 85 ++++++++++++++---------------------------
> mm/swap.c               | 38 +-----------------
> mm/truncate.c           | 33 +++-------------
> 6 files changed, 45 insertions(+), 137 deletions(-)

Very nice cleanups and the code makes more sense, thanks.

Reviewed-by: William Kucharski <william.kucharski@...cle.com>