target/linux/generic/backport-6.1/020-v6.3-16-UPSTREAM-mm-multi-gen-LRU-improve-lru_gen_exit_memcg.patch

   1 From bec433f29537652ed054148edfd7e2183ddcf7c3 Mon Sep 17 00:00:00 2001
   2 From: "T.J. Alumbaugh" <talumbau@google.com>
   3 Date: Wed, 18 Jan 2023 00:18:25 +0000
   4 Subject: [PATCH 16/19] UPSTREAM: mm: multi-gen LRU: improve
   5  lru_gen_exit_memcg()
   6
   7 Add warnings and poison ->next.
   8
   9 Link: https://lkml.kernel.org/r/20230118001827.1040870-6-talumbau@google.com
  10 Change-Id: I53de9e04c1ae941e122b33cd45d2bbb5f34aae0c
  11 Signed-off-by: T.J. Alumbaugh <talumbau@google.com>
  12 Cc: Yu Zhao <yuzhao@google.com>
  13 Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
  14 (cherry picked from commit 37cc99979d04cca677c0ad5c0acd1149ec165d1b)
  15 Bug: 274865848
  16 Signed-off-by: T.J. Mercier <tjmercier@google.com>
  17 ---
  18  mm/vmscan.c | 5 +++++
  19  1 file changed, 5 insertions(+)
  20
  21 --- a/mm/vmscan.c
  22 +++ b/mm/vmscan.c
  23 @@ -6172,12 +6172,17 @@ void lru_gen_exit_memcg(struct mem_cgrou
  24         int i;
  25         int nid;
  26
  27 +       VM_WARN_ON_ONCE(!list_empty(&memcg->mm_list.fifo));
  28 +
  29         for_each_node(nid) {
  30                 struct lruvec *lruvec = get_lruvec(memcg, nid);
  31
  32 +               VM_WARN_ON_ONCE(lruvec->mm_state.nr_walkers);
  33                 VM_WARN_ON_ONCE(memchr_inv(lruvec->lrugen.nr_pages, 0,
  34                                            sizeof(lruvec->lrugen.nr_pages)));
  35
  36 +               lruvec->lrugen.list.next = LIST_POISON1;
  37 +
  38                 for (i = 0; i < NR_BLOOM_FILTERS; i++) {
  39                         bitmap_free(lruvec->mm_state.filters[i]);
  40                         lruvec->mm_state.filters[i] = NULL;