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mm: fix shmem THP counters on migration 

JIRA: https://issues.redhat.com/browse/RHEL-27742

This patch is a backport of the following upstream commit:
commit 0b52c420350e8f9873ba62768cd8246827184408
Author: Jan Glauber <jglauber@digitalocean.com>
Date:   Mon Jun 19 12:33:51 2023 +0200

    mm: fix shmem THP counters on migration

    The per node numa_stat values for shmem don't change on page migration for
    THP:

      grep shmem /sys/fs/cgroup/machine.slice/.../memory.numa_stat:

        shmem N0=1092616192 N1=10485760
        shmem_thp N0=1092616192 N1=10485760

      migratepages 9181 0 1:

        shmem N0=0 N1=1103101952
        shmem_thp N0=1092616192 N1=10485760

    Fix that by updating shmem_thp counters likewise to shmem counters on page
    migration.

    [jglauber@digitalocean.com: use folio_test_pmd_mappable instead of folio_test_transhuge]
      Link: https://lkml.kernel.org/r/20230622094720.510540-1-jglauber@digitalocean.com
    Link: https://lkml.kernel.org/r/20230619103351.234837-1-jglauber@digitalocean.com
    Signed-off-by: Jan Glauber <jglauber@digitalocean.com>
    Reviewed-by: Baolin Wang <baolin.wang@linux.alibaba.com>
    Cc: "Huang, Ying" <ying.huang@intel.com>
    Signed-off-by: Andrew Morton <akpm@linux-foundation.org>

Signed-off-by: Rafael Aquini <raquini@redhat.com>
This commit is contained in:
Rafael Aquini 2024-09-05 20:32:52 -04:00
parent 646c680a0c
commit a8c6b788e8
1 changed files with 5 additions and 0 deletions
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5
mm/migrate.c
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@ -493,6 +493,11 @@ int folio_migrate_mapping(struct address_space *mapping,
if (folio_test_swapbacked(folio) && !folio_test_swapcache(folio)) {
__mod_lruvec_state(old_lruvec, NR_SHMEM, -nr);
__mod_lruvec_state(new_lruvec, NR_SHMEM, nr);
if (folio_test_pmd_mappable(folio)) {
__mod_lruvec_state(old_lruvec, NR_SHMEM_THPS, -nr);
__mod_lruvec_state(new_lruvec, NR_SHMEM_THPS, nr);
}
}
#ifdef CONFIG_SWAP
if (folio_test_swapcache(folio)) {