linux-kernel - [PATCH 0/3] mm/smaps: Fixes and optimizations on shmem swap handling

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Message-Id: <20210917164756.8586-1-peterx@redhat.com>
Date:   Fri, 17 Sep 2021 12:47:53 -0400
From:   Peter Xu <peterx@...hat.com>
To:     linux-mm@...ck.org, linux-kernel@...r.kernel.org
Cc:     Vlastimil Babka <vbabka@...e.cz>,
        Andrew Morton <akpm@...ux-foundation.org>,
        Hugh Dickins <hughd@...gle.com>,
        Andrea Arcangeli <aarcange@...hat.com>, peterx@...hat.com,
        Matthew Wilcox <willy@...radead.org>
Subject: [PATCH 0/3] mm/smaps: Fixes and optimizations on shmem swap handling

This series grows from the patch previously posted here:

  [PATCH] mm/smaps: Use vma->vm_pgoff directly when counting partial swap
  https://lore.kernel.org/lkml/20210916215839.95177-1-peterx@redhat.com/

Vlastimil reported a bug that is even more important to fix than the cleanup,
so I put it as patch 1 here.  There's a test program we can use to verify the
bug before/after the patch.  I used the same program to test patch 2/3 because
it covers walking shmem swap both in page cache and in pgtables.

Patch 2 is the original patch, though with a tiny touchup as Vlastimil
suggested.

Patch 3 is a further cleanup of the shmem swap logic, hopefully make it even
cleaner.

Please review, thanks.

Peter Xu (3):
  mm/smaps: Fix shmem pte hole swap calculation
  mm/smaps: Use vma->vm_pgoff directly when counting partial swap
  mm/smaps: Simplify shmem handling of pte holes

 fs/proc/task_mmu.c | 28 ++++++++++++++++------------
 mm/shmem.c         |  5 ++---
 2 files changed, 18 insertions(+), 15 deletions(-)

-- 
2.31.1