The patch titled
Subject: mm/sparse.c: use kvmalloc/kvfree to alloc/free memmap for the classic sparse
has been added to the -mm tree. Its filename is
mm-sparsec-use-kvmalloc-kvfree-to-alloc-free-memmap-for-the-classic-sparse.patch
This patch should soon appear at
http://ozlabs.org/~akpm/mmots/broken-out/mm-sparsec-use-kvmalloc-kvfree-to-alloc-free-memmap-for-the-classic-sparse.patch
and later at
http://ozlabs.org/~akpm/mmotm/broken-out/mm-sparsec-use-kvmalloc-kvfree-to-alloc-free-memmap-for-the-classic-sparse.patch
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------------------------------------------------------
From: Baoquan He <bhe@xxxxxxxxxx>
Subject: mm/sparse.c: use kvmalloc/kvfree to alloc/free memmap for the classic sparse
This change makes populate_section_memmap()/depopulate_section_memmap
much simpler.
Link: http://lkml.kernel.org/r/20200316125450.GG3486@MiWiFi-R3L-srv
Signed-off-by: Baoquan He <bhe@xxxxxxxxxx>
Suggested-by: Michal Hocko <mhocko@xxxxxxxxxx>
Reviewed-by: David Hildenbrand <david@xxxxxxxxxx>
Acked-by: Michal Hocko <mhocko@xxxxxxxx>
Reviewed-by: Pankaj Gupta <pankaj.gupta.linux@xxxxxxxxx>
Reviewed-by: Matthew Wilcox (Oracle) <willy@xxxxxxxxxxxxx>
Signed-off-by: Andrew Morton <akpm@xxxxxxxxxxxxxxxxxxxx>
---
mm/sparse.c | 27 +++------------------------
1 file changed, 3 insertions(+), 24 deletions(-)
--- a/mm/sparse.c~mm-sparsec-use-kvmalloc-kvfree-to-alloc-free-memmap-for-the-classic-sparse
+++ a/mm/sparse.c
@@ -664,35 +664,14 @@ static void free_map_bootmem(struct page
struct page * __meminit populate_section_memmap(unsigned long pfn,
unsigned long nr_pages, int nid, struct vmem_altmap *altmap)
{
- struct page *page, *ret;
- unsigned long memmap_size = sizeof(struct page) * PAGES_PER_SECTION;
-
- page = alloc_pages(GFP_KERNEL|__GFP_NOWARN, get_order(memmap_size));
- if (page)
- goto got_map_page;
-
- ret = vmalloc(memmap_size);
- if (ret)
- goto got_map_ptr;
-
- return NULL;
-got_map_page:
- ret = (struct page *)pfn_to_kaddr(page_to_pfn(page));
-got_map_ptr:
-
- return ret;
+ return kvmalloc(array_size(sizeof(struct page),
+ PAGES_PER_SECTION), GFP_KERNEL);
}
static void depopulate_section_memmap(unsigned long pfn, unsigned long nr_pages,
struct vmem_altmap *altmap)
{
- struct page *memmap = pfn_to_page(pfn);
-
- if (is_vmalloc_addr(memmap))
- vfree(memmap);
- else
- free_pages((unsigned long)memmap,
- get_order(sizeof(struct page) * PAGES_PER_SECTION));
+ kvfree(pfn_to_page(pfn));
}
static void free_map_bootmem(struct page *memmap)
_
Patches currently in -mm which might be from bhe@xxxxxxxxxx are
mm-hotplug-fix-hot-remove-failure-in-sparsememvmemmap-case.patch
mm-sparsec-use-kvmalloc-kvfree-to-alloc-free-memmap-for-the-classic-sparse.patch
mm-hotplug-only-respect-mem=-parameter-during-boot-stage.patch
mm-sparsec-introduce-new-function-fill_subsection_map.patch
mm-sparsec-introduce-a-new-function-clear_subsection_map.patch
mm-sparsec-only-use-subsection-map-in-vmemmap-case.patch
mm-sparsec-add-note-about-only-vmemmap-supporting-sub-section-hotplug.patch
mm-sparsec-move-subsection_map-related-functions-together.patch
