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mm: multi-gen LRU: improve lru_gen_exit_memcg()

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Add warnings and poison ->next.

Link: https://lkml.kernel.org/r/20230118001827.1040870-6-talumbau@google.com
Signed-off-by: T.J. Alumbaugh <talumbau@google.com>
Cc: Yu Zhao <yuzhao@google.com>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
This commit is contained in:
T.J. Alumbaugh 2023-01-18 00:18:25 +00:00 committed by Andrew Morton
parent 36c7b4db7c
commit 37cc99979d
1 changed files with 5 additions and 0 deletions
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5
mm/vmscan.c
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@ -6168,12 +6168,17 @@ void lru_gen_exit_memcg(struct mem_cgroup *memcg)
int i;
int nid;
VM_WARN_ON_ONCE(!list_empty(&memcg->mm_list.fifo));
for_each_node(nid) {
struct lruvec *lruvec = get_lruvec(memcg, nid);
VM_WARN_ON_ONCE(lruvec->mm_state.nr_walkers);
VM_WARN_ON_ONCE(memchr_inv(lruvec->lrugen.nr_pages, 0,
sizeof(lruvec->lrugen.nr_pages)));
lruvec->lrugen.list.next = LIST_POISON1;
for (i = 0; i < NR_BLOOM_FILTERS; i++) {
bitmap_free(lruvec->mm_state.filters[i]);
lruvec->mm_state.filters[i] = NULL;