The patch titled
Subject: mm,page_alloc: drop unnecessary checks from pfn_range_valid_contig
has been added to the -mm tree. Its filename is
mmpage_alloc-drop-unnecessary-checks-from-pfn_range_valid_contig.patch
This patch should soon appear at
https://ozlabs.org/~akpm/mmots/broken-out/mmpage_alloc-drop-unnecessary-checks-from-pfn_range_valid_contig.patch
and later at
https://ozlabs.org/~akpm/mmotm/broken-out/mmpage_alloc-drop-unnecessary-checks-from-pfn_range_valid_contig.patch
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------------------------------------------------------
From: Oscar Salvador <osalvador@xxxxxxx>
Subject: mm,page_alloc: drop unnecessary checks from pfn_range_valid_contig
pfn_range_valid_contig() bails out when it finds an in-use page or a
hugetlb page, among other things. We can drop the in-use page check since
__alloc_contig_pages can migrate away those pages, and the hugetlb page
check can go too since isolate_migratepages_range is now capable of
dealing with hugetlb pages. Either way, those checks are racy so let the
end function handle it when the time comes.
Link: https://lkml.kernel.org/r/20210419075413.1064-8-osalvador@xxxxxxx
Signed-off-by: Oscar Salvador <osalvador@xxxxxxx>
Suggested-by: David Hildenbrand <david@xxxxxxxxxx>
Reviewed-by: David Hildenbrand <david@xxxxxxxxxx>
Acked-by: Mike Kravetz <mike.kravetz@xxxxxxxxxx>
Acked-by: Michal Hocko <mhocko@xxxxxxxx>
Cc: Muchun Song <songmuchun@xxxxxxxxxxxxx>
Cc: Vlastimil Babka <vbabka@xxxxxxx>
Signed-off-by: Andrew Morton <akpm@xxxxxxxxxxxxxxxxxxxx>
---
mm/page_alloc.c | 6 ------
1 file changed, 6 deletions(-)
--- a/mm/page_alloc.c~mmpage_alloc-drop-unnecessary-checks-from-pfn_range_valid_contig
+++ a/mm/page_alloc.c
@@ -8898,12 +8898,6 @@ static bool pfn_range_valid_contig(struc
if (PageReserved(page))
return false;
-
- if (page_count(page) > 0)
- return false;
-
- if (PageHuge(page))
- return false;
}
return true;
}
_
Patches currently in -mm which might be from osalvador@xxxxxxx are
x86-vmemmap-drop-handling-of-4k-unaligned-vmemmap-range.patch
x86-vmemmap-drop-handling-of-1gb-vmemmap-ranges.patch
x86-vmemmap-handle-unpopulated-sub-pmd-ranges.patch
x86-vmemmap-handle-unpopulated-sub-pmd-ranges-fix.patch
x86-vmemmap-optimize-for-consecutive-sections-in-partial-populated-pmds.patch
mmpage_alloc-bail-out-earlier-on-enomem-in-alloc_contig_migrate_range.patch
mmcompaction-let-isolate_migratepages_rangeblock-return-error-codes.patch
mmhugetlb-drop-clearing-of-flag-from-prep_new_huge_page.patch
mmhugetlb-split-prep_new_huge_page-functionality.patch
mm-make-alloc_contig_range-handle-free-hugetlb-pages.patch
mm-make-alloc_contig_range-handle-in-use-hugetlb-pages.patch
mmpage_alloc-drop-unnecessary-checks-from-pfn_range_valid_contig.patch
drivers-base-memory-introduce-memory_block_onlineoffline.patch
mmmemory_hotplug-relax-fully-spanned-sections-check.patch
mmmemory_hotplug-allocate-memmap-from-the-added-memory-range.patch
acpimemhotplug-enable-mhp_memmap_on_memory-when-supported.patch
mmmemory_hotplug-add-kernel-boot-option-to-enable-memmap_on_memory.patch
x86-kconfig-introduce-arch_mhp_memmap_on_memory_enable.patch
arm64-kconfig-introduce-arch_mhp_memmap_on_memory_enable.patch
