mm/khugepaged: keep mm in mm_slot without MMF_DISABLE_THP check
Previously, we removed the mm from mm_slot and dropped mm_count
if the MMF_THP_DISABLE flag was set. However, we didn't re-add
the mm back after clearing the MMF_THP_DISABLE flag. Additionally,
We add a check for the MMF_THP_DISABLE flag in hugepage_vma_revalidate().
Link: https://lkml.kernel.org/r/20240227035135.54593-1-ioworker0@gmail.com
Fixes: 879c6000e1
("mm/khugepaged: bypassing unnecessary scans with MMF_DISABLE_THP check")
Signed-off-by: Lance Yang <ioworker0@gmail.com>
Suggested-by: Yang Shi <shy828301@gmail.com>
Reviewed-by: Yang Shi <shy828301@gmail.com>
Reviewed-by: David Hildenbrand <david@redhat.com>
Cc: Michal Hocko <mhocko@suse.com>
Cc: Minchan Kim <minchan@kernel.org>
Cc: Muchun Song <songmuchun@bytedance.com>
Cc: Peter Xu <peterx@redhat.com>
Cc: Zach O'Keefe <zokeefe@google.com>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
This commit is contained in:
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@ -920,7 +920,7 @@ static int hugepage_vma_revalidate(struct mm_struct *mm, unsigned long address,
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{
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struct vm_area_struct *vma;
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if (unlikely(hpage_collapse_test_exit(mm)))
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if (unlikely(hpage_collapse_test_exit_or_disable(mm)))
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return SCAN_ANY_PROCESS;
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*vmap = vma = find_vma(mm, address);
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@ -1428,7 +1428,7 @@ static void collect_mm_slot(struct khugepaged_mm_slot *mm_slot)
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lockdep_assert_held(&khugepaged_mm_lock);
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if (hpage_collapse_test_exit_or_disable(mm)) {
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if (hpage_collapse_test_exit(mm)) {
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/* free mm_slot */
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hash_del(&slot->hash);
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list_del(&slot->mm_node);
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@ -2456,7 +2456,7 @@ breakouterloop_mmap_lock:
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* Release the current mm_slot if this mm is about to die, or
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* if we scanned all vmas of this mm.
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*/
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if (hpage_collapse_test_exit_or_disable(mm) || !vma) {
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if (hpage_collapse_test_exit(mm) || !vma) {
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/*
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* Make sure that if mm_users is reaching zero while
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* khugepaged runs here, khugepaged_exit will find
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