The patch titled
Subject: mm, thp: clear PG_mlocked when last mapping gone
has been added to the -mm tree. Its filename is
thp-allow-mlocked-thp-again-fix-2.patch
This patch should soon appear at
http://ozlabs.org/~akpm/mmots/broken-out/thp-allow-mlocked-thp-again-fix-2.patch
and later at
http://ozlabs.org/~akpm/mmotm/broken-out/thp-allow-mlocked-thp-again-fix-2.patch
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From: "Kirill A. Shutemov" <kirill.shutemov@xxxxxxxxxxxxxxx>
Subject: mm, thp: clear PG_mlocked when last mapping gone
I missed clear_page_mlock() in page_remove_anon_compound_rmap().
It usually shouldn't cause any problems since we munlock pages
explicitly, but in conjunction with missed munlock in __oom_reap_vmas()
it causes problems:
http://lkml.kernel.org/r/5661FBB6.6050307@xxxxxxxxxx
Let's put it in place an mirror behaviour for small pages.
NOTE: I'm not entirely sure why we ever need clear_page_mlock() in
page_remove_rmap() codepath. It looks redundant to me as we munlock
pages anyway. But this is out of scope of the patch.
The patch can be folded into
"thp: allow mlocked THP again"
Signed-off-by: Kirill A. Shutemov <kirill.shutemov@xxxxxxxxxxxxxxx>
Reported-by: Sasha Levin <sasha.levin@xxxxxxxxxx>
Signed-off-by: Andrew Morton <akpm@xxxxxxxxxxxxxxxxxxxx>
---
mm/rmap.c | 3 +++
1 file changed, 3 insertions(+)
diff -puN mm/rmap.c~thp-allow-mlocked-thp-again-fix-2 mm/rmap.c
--- a/mm/rmap.c~thp-allow-mlocked-thp-again-fix-2
+++ a/mm/rmap.c
@@ -1282,6 +1282,9 @@ static void page_remove_anon_compound_rm
nr = HPAGE_PMD_NR;
}
+ if (unlikely(PageMlocked(page)))
+ clear_page_mlock(page);
+
if (nr) {
__mod_zone_page_state(page_zone(page), NR_ANON_PAGES, -nr);
deferred_split_huge_page(page);
_
Patches currently in -mm which might be from kirill.shutemov@xxxxxxxxxxxxxxx are
mm-make-sure-isolate_lru_page-is-never-called-for-tail-page.patch
mm-make-optimistic-check-for-swapin-readahead-fix.patch
mm-make-swapin-readahead-to-improve-thp-collapse-rate-fix.patch
mm-make-swapin-readahead-to-improve-thp-collapse-rate-fix-2.patch
mm-make-swapin-readahead-to-improve-thp-collapse-rate-fix-3.patch
page-flags-trivial-cleanup-for-pagetrans-helpers.patch
page-flags-move-code-around.patch
page-flags-introduce-page-flags-policies-wrt-compound-pages.patch
page-flags-introduce-page-flags-policies-wrt-compound-pages-fix.patch
page-flags-introduce-page-flags-policies-wrt-compound-pages-fix-fix.patch
page-flags-introduce-page-flags-policies-wrt-compound-pages-fix-3.patch
page-flags-define-pg_locked-behavior-on-compound-pages.patch
page-flags-define-behavior-of-fs-io-related-flags-on-compound-pages.patch
page-flags-define-behavior-of-lru-related-flags-on-compound-pages.patch
page-flags-define-behavior-slb-related-flags-on-compound-pages.patch
page-flags-define-behavior-of-xen-related-flags-on-compound-pages.patch
page-flags-define-pg_reserved-behavior-on-compound-pages.patch
page-flags-define-pg_reserved-behavior-on-compound-pages-fix.patch
page-flags-define-pg_swapbacked-behavior-on-compound-pages.patch
page-flags-define-pg_swapcache-behavior-on-compound-pages.patch
page-flags-define-pg_mlocked-behavior-on-compound-pages.patch
page-flags-define-pg_uncached-behavior-on-compound-pages.patch
page-flags-define-pg_uptodate-behavior-on-compound-pages.patch
page-flags-look-at-head-page-if-the-flag-is-encoded-in-page-mapping.patch
mm-sanitize-page-mapping-for-tail-pages.patch
page-flags-drop-__testclearpage-helpers.patch
mm-proc-adjust-pss-calculation.patch
rmap-add-argument-to-charge-compound-page.patch
memcg-adjust-to-support-new-thp-refcounting.patch
mm-thp-adjust-conditions-when-we-can-reuse-the-page-on-wp-fault.patch
mm-adjust-foll_split-for-new-refcounting.patch
mm-handle-pte-mapped-tail-pages-in-gerneric-fast-gup-implementaiton.patch
thp-mlock-do-not-allow-huge-pages-in-mlocked-area.patch
khugepaged-ignore-pmd-tables-with-thp-mapped-with-ptes.patch
thp-rename-split_huge_page_pmd-to-split_huge_pmd.patch
mm-vmstats-new-thp-splitting-event.patch
mm-temporally-mark-thp-broken.patch
thp-drop-all-split_huge_page-related-code.patch
mm-drop-tail-page-refcounting.patch
futex-thp-remove-special-case-for-thp-in-get_futex_key.patch
ksm-prepare-to-new-thp-semantics.patch
mm-thp-remove-compound_lock.patch
arm64-thp-remove-infrastructure-for-handling-splitting-pmds.patch
arm-thp-remove-infrastructure-for-handling-splitting-pmds.patch
mips-thp-remove-infrastructure-for-handling-splitting-pmds.patch
powerpc-thp-remove-infrastructure-for-handling-splitting-pmds.patch
s390-thp-remove-infrastructure-for-handling-splitting-pmds.patch
sparc-thp-remove-infrastructure-for-handling-splitting-pmds.patch
tile-thp-remove-infrastructure-for-handling-splitting-pmds.patch
x86-thp-remove-infrastructure-for-handling-splitting-pmds.patch
mm-thp-remove-infrastructure-for-handling-splitting-pmds.patch
mm-rework-mapcount-accounting-to-enable-4k-mapping-of-thps.patch
mm-rework-mapcount-accounting-to-enable-4k-mapping-of-thps-fix-2.patch
mm-rework-mapcount-accounting-to-enable-4k-mapping-of-thps-fix-3.patch
mm-differentiate-page_mapped-from-page_mapcount-for-compound-pages.patch
mm-numa-skip-pte-mapped-thp-on-numa-fault.patch
thp-implement-split_huge_pmd.patch
thp-add-option-to-setup-migration-entries-during-pmd-split.patch
thp-mm-split_huge_page-caller-need-to-lock-page.patch
thp-reintroduce-split_huge_page.patch
thp-reintroduce-split_huge_page-fix-3.patch
thp-reintroduce-split_huge_page-fix-4.patch
migrate_pages-try-to-split-pages-on-qeueuing.patch
thp-introduce-deferred_split_huge_page.patch
thp-introduce-deferred_split_huge_page-fix.patch
mm-re-enable-thp.patch
thp-update-documentation.patch
thp-allow-mlocked-thp-again.patch
thp-allow-mlocked-thp-again-fix.patch
thp-allow-mlocked-thp-again-fix-2.patch
mm-prepare-page_referenced-and-page_idle-to-new-thp-refcounting.patch
mm-prepare-page_referenced-and-page_idle-to-new-thp-refcounting-fix-fix.patch
mm-prepare-page_referenced-and-page_idle-to-new-thp-refcounting-fix-fix-fix.patch
thp-add-debugfs-handle-to-split-all-huge-pages.patch
thp-increase-split_huge_page-success-rate.patch
mm-dax-dax-pmd-vs-thp-pmd-vs-hugetlbfs-pmd-fix.patch
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