The patch titled
Subject: mm: numa: disable change protection for vma(VM_HUGETLB)
has been added to the -mm tree. Its filename is
mm-numa-disable-change-protection-for-vmavm_hugetlb.patch
This patch should soon appear at
http://ozlabs.org/~akpm/mmots/broken-out/mm-numa-disable-change-protection-for-vmavm_hugetlb.patch
and later at
http://ozlabs.org/~akpm/mmotm/broken-out/mm-numa-disable-change-protection-for-vmavm_hugetlb.patch
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------------------------------------------------------
From: Naoya Horiguchi <n-horiguchi@xxxxxxxxxxxxx>
Subject: mm: numa: disable change protection for vma(VM_HUGETLB)
Currently when a process accesses a hugetlb range protected with PROTNONE,
unexpected COWs are triggered, which finally puts the hugetlb subsystem
into a broken/uncontrollable state, where for example h->resv_huge_pages
is subtracted too much and wraps around to a very large number, and the
free hugepage pool is no longer maintainable.
This patch simply stops changing protection for vma(VM_HUGETLB) to fix the
problem. And this also allows us to avoid useless overhead of minor
faults.
Signed-off-by: Naoya Horiguchi <n-horiguchi@xxxxxxxxxxxxx>
Suggested-by: Mel Gorman <mgorman@xxxxxxx>
Cc: Hugh Dickins <hughd@xxxxxxxxxx>
Cc: "Kirill A. Shutemov" <kirill@xxxxxxxxxxxxx>
Cc: "David Rientjes" <rientjes@xxxxxxxxxx>
Cc: Rik van Riel <riel@xxxxxxxxxx>
Cc: Peter Zijlstra <a.p.zijlstra@xxxxxxxxx>
Cc: Ingo Molnar <mingo@xxxxxxx>
Signed-off-by: Andrew Morton <akpm@xxxxxxxxxxxxxxxxxxxx>
---
kernel/sched/fair.c | 4 +++-
1 file changed, 3 insertions(+), 1 deletion(-)
diff -puN kernel/sched/fair.c~mm-numa-disable-change-protection-for-vmavm_hugetlb kernel/sched/fair.c
--- a/kernel/sched/fair.c~mm-numa-disable-change-protection-for-vmavm_hugetlb
+++ a/kernel/sched/fair.c
@@ -2165,8 +2165,10 @@ void task_numa_work(struct callback_head
vma = mm->mmap;
}
for (; vma; vma = vma->vm_next) {
- if (!vma_migratable(vma) || !vma_policy_mof(vma))
+ if (!vma_migratable(vma) || !vma_policy_mof(vma) ||
+ is_vm_hugetlb_page(vma)) {
continue;
+ }
/*
* Shared library pages mapped by multiple processes are not
_
Patches currently in -mm which might be from n-horiguchi@xxxxxxxxxxxxx are
mm-numa-disable-change-protection-for-vmavm_hugetlb.patch
mm-refactor-do_wp_page-extract-the-reuse-case.patch
mm-refactor-do_wp_page-rewrite-the-unlock-flow.patch
mm-refactor-do_wp_page-extract-the-page-copy-flow.patch
mm-refactor-do_wp_page-handling-of-shared-vma-into-a-function.patch
mm-mempolicy-migrate_to_node-should-only-migrate-to-node.patch
mm-hugetlb-abort-__get_user_pages-if-current-has-been-oom-killed.patch
mm-memory-failurec-define-page-types-for-action_result-in-one-place.patch
mm-memory-failurec-define-page-types-for-action_result-in-one-place-v3.patch
mm-consolidate-all-page-flags-helpers-in-linux-page-flagsh.patch
page-flags-trivial-cleanup-for-pagetrans-helpers.patch
page-flags-introduce-page-flags-policies-wrt-compound-pages.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_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-on-head-page-if-the-flag-is-encoded-in-page-mapping.patch
mm-sanitize-page-mapping-for-tail-pages.patch
mm-dont-call-__page_cache_release-for-hugetlb.patch
mm-hugetlb-introduce-pagehugeactive-flag.patch
mm-hugetlb-introduce-pagehugeactive-flag-fix.patch
mm-hugetlb-cleanup-using-pagehugeactive-flag.patch
mm-hugetlb-cleanup-using-pagehugeactive-flag-fix.patch
do_shared_fault-check-that-mmap_sem-is-held.patch
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