The patch titled
Subject: mm/hugetlb: narrow the hugetlb_lock protection area during preparing huge page
has been added to the -mm tree. Its filename is
mm-hugetlb-narrow-the-hugetlb_lock-protection-area-during-preparing-huge-page.patch
This patch should soon appear at
https://ozlabs.org/~akpm/mmots/broken-out/mm-hugetlb-narrow-the-hugetlb_lock-protection-area-during-preparing-huge-page.patch
and later at
https://ozlabs.org/~akpm/mmotm/broken-out/mm-hugetlb-narrow-the-hugetlb_lock-protection-area-during-preparing-huge-page.patch
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------------------------------------------------------
From: Wei Yang <richard.weiyang@xxxxxxxxxxxxxxxxx>
Subject: mm/hugetlb: narrow the hugetlb_lock protection area during preparing huge page
set_hugetlb_cgroup_[rsvd] just manipulate page local data, which is not
necessary to be protected by hugetlb_lock.
Let's take this out.
Link: https://lkml.kernel.org/r/20200831022351.20916-7-richard.weiyang@xxxxxxxxxxxxxxxxx
Signed-off-by: Wei Yang <richard.weiyang@xxxxxxxxxxxxxxxxx>
Reviewed-by: Baoquan He <bhe@xxxxxxxxxx>
Reviewed-by: Mike Kravetz <mike.kravetz@xxxxxxxxxx>
Signed-off-by: Andrew Morton <akpm@xxxxxxxxxxxxxxxxxxxx>
---
mm/hugetlb.c | 2 +-
1 file changed, 1 insertion(+), 1 deletion(-)
--- a/mm/hugetlb.c~mm-hugetlb-narrow-the-hugetlb_lock-protection-area-during-preparing-huge-page
+++ a/mm/hugetlb.c
@@ -1500,9 +1500,9 @@ static void prep_new_huge_page(struct hs
{
INIT_LIST_HEAD(&page->lru);
set_compound_page_dtor(page, HUGETLB_PAGE_DTOR);
- spin_lock(&hugetlb_lock);
set_hugetlb_cgroup(page, NULL);
set_hugetlb_cgroup_rsvd(page, NULL);
+ spin_lock(&hugetlb_lock);
h->nr_huge_pages++;
h->nr_huge_pages_node[nid]++;
spin_unlock(&hugetlb_lock);
_
Patches currently in -mm which might be from richard.weiyang@xxxxxxxxxxxxxxxxx are
mm-mmap-rename-__vma_unlink_common-to-__vma_unlink.patch
mm-mmap-leverage-vma_rb_erase_ignore-to-implement-vma_rb_erase.patch
mm-mmap-leave-adjust_next-as-virtual-address-instead-of-page-frame-number.patch
mm-hugetlb-not-necessary-to-coalesce-regions-recursively.patch
mm-hugetlb-remove-vm_bug_onnrg-in-get_file_region_entry_from_cache.patch
mm-hugetlb-use-list_splice-to-merge-two-list-at-once.patch
mm-hugetlb-count-file_region-to-be-added-when-regions_needed-=-null.patch
mm-hugetlb-a-page-from-buddy-is-not-on-any-list.patch
mm-hugetlb-narrow-the-hugetlb_lock-protection-area-during-preparing-huge-page.patch
mm-hugetlb-take-the-free-hpage-during-the-iteration-directly.patch
mm-page_reporting-drop-stale-list-head-check-in-page_reporting_cycle.patch
bitops-simplify-get_count_order_long.patch
bitops-use-the-same-mechanism-for-get_count_order.patch
