[0/3] mm/smaps: Fixes and optimizations on shmem swap handling

Message

Peter Xu Sept. 17, 2021, 4:47 p.m. UTC

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/[e-mail]/

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(-)