]> www.infradead.org Git - users/jedix/linux-maple.git/commit
mm/khugepaged: drain lru after swapping in shmem
authorDavid Stevens <stevensd@chromium.org>
Tue, 4 Apr 2023 12:01:14 +0000 (21:01 +0900)
committerAndrew Morton <akpm@linux-foundation.org>
Wed, 5 Apr 2023 23:02:52 +0000 (16:02 -0700)
commitad1b62f289addc77f43779ae5238f1d1ac718f9f
tree936a428a6f5862704678a532c2a769b3184c8511
parent38c7d08d7ae6a2c83b56951e418197d412503502
mm/khugepaged: drain lru after swapping in shmem

Patch series "mm/khugepaged: fixes for khugepaged+shmem", v6.

This series reworks collapse_file so that the intermediate state of the
collapse does not leak out of collapse_file. Although this makes
collapse_file a bit more complicated, it means that the rest of the
kernel doesn't have to deal with the unusual state. This directly fixes
races with both lseek and mincore.

This series also fixes the fact that khugepaged completely breaks
userfaultfd+shmem. The rework of collapse_file provides a convenient
place to check for registered userfaultfds without making the shmem
userfaultfd implementation care about khugepaged.

Finally, this series adds a lru_add_drain after swapping in shmem pages,
which makes the subsequent folio_isolate_lru significantly more likely to
succeed.

This patch (of 4):

Call lru_add_drain after swapping in shmem pages so that isolate_lru_page
is more likely to succeed.

Link: https://lkml.kernel.org/r/20230404120117.2562166-1-stevensd@google.com
Link: https://lkml.kernel.org/r/20230404120117.2562166-2-stevensd@google.com
Signed-off-by: David Stevens <stevensd@chromium.org>
Cc: David Hildenbrand <david@redhat.com>
Cc: Hugh Dickins <hughd@google.com>
Cc: Jiaqi Yan <jiaqiyan@google.com>
Cc: "Kirill A. Shutemov" <kirill@shutemov.name>
Cc: Matthew Wilcox (Oracle) <willy@infradead.org>
Cc: Peter Xu <peterx@redhat.com>
Cc: Yang Shi <shy828301@gmail.com>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
mm/khugepaged.c