The patch titled
Subject: mm: page_alloc: generalize order handling in __free_pages_bootmem()
has been added to the -mm tree. Its filename is
mm-page_alloc-generalize-order-handling-in-__free_pages_bootmem.patch
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------------------------------------------------------
From: Johannes Weiner <hannes@xxxxxxxxxxx>
Subject: mm: page_alloc: generalize order handling in __free_pages_bootmem()
__free_pages_bootmem() used to special-case higher-order frees to save
individual page checking with free_pages_bulk().
Nowadays, both zero order and non-zero order frees use free_pages(), which
checks each individual page anyway, and so there is little point in making
the distinction anymore. The higher-order loop will work just fine for
zero order pages.
Signed-off-by: Johannes Weiner <hannes@xxxxxxxxxxx>
Cc: Uwe Kleine-König <u.kleine-koenig@xxxxxxxxxxxxxx>
Signed-off-by: Andrew Morton <akpm@xxxxxxxxxxxxxxxxxxxx>
---
mm/page_alloc.c | 38 +++++++++++++-------------------------
1 file changed, 13 insertions(+), 25 deletions(-)
diff -puN mm/page_alloc.c~mm-page_alloc-generalize-order-handling-in-__free_pages_bootmem mm/page_alloc.c
--- a/mm/page_alloc.c~mm-page_alloc-generalize-order-handling-in-__free_pages_bootmem
+++ a/mm/page_alloc.c
@@ -743,36 +743,24 @@ static void __free_pages_ok(struct page
local_irq_restore(flags);
}
-/*
- * permit the bootmem allocator to evade page validation on high-order frees
- */
void __meminit __free_pages_bootmem(struct page *page, unsigned int order)
{
- if (order == 0) {
- __ClearPageReserved(page);
- set_page_count(page, 0);
- set_page_refcounted(page);
- __free_page(page);
- } else {
- int loop;
- unsigned int nr_pages = 1 << order;
- unsigned int loop;
-
- prefetchw(page);
- for (loop = 0; loop < nr_pages; loop++) {
- struct page *p = &page[loop];
-
- if (loop + 1 < nr_pages)
- prefetchw(p + 1);
- __ClearPageReserved(p);
- set_page_count(p, 0);
- }
+ unsigned int nr_pages = 1 << order;
+ unsigned int loop;
- set_page_refcounted(page);
- __free_pages(page, order);
+ prefetchw(page);
+ for (loop = 0; loop < nr_pages; loop++) {
+ struct page *p = &page[loop];
+
+ if (loop + 1 < nr_pages)
+ prefetchw(p + 1);
+ __ClearPageReserved(p);
+ set_page_count(p, 0);
}
-}
+ set_page_refcounted(page);
+ __free_pages(page, order);
+}
/*
* The order of subdivision here is critical for the IO subsystem.
_
Subject: Subject: mm: page_alloc: generalize order handling in __free_pages_bootmem()
Patches currently in -mm which might be from hannes@xxxxxxxxxxx are
linux-next.patch
memcg-add-mem_cgroup_replace_page_cache-to-fix-lru-issue.patch
mm-page-writebackc-make-determine_dirtyable_memory-static-again.patch
vmscan-promote-shared-file-mapped-pages.patch
vmscan-activate-executable-pages-after-first-usage.patch
mm-do-not-stall-in-synchronous-compaction-for-thp-allocations.patch
mm-do-not-stall-in-synchronous-compaction-for-thp-allocations-v3.patch
vmscan-add-task-name-to-warn_scan_unevictable-messages.patch
mm-page_alloc-remove-order-assumption-from-__free_pages_bootmem.patch
mm-page_alloc-generalize-order-handling-in-__free_pages_bootmem.patch
mm-bootmem-drop-superfluous-range-check-when-freeing-pages-in-bulk.patch
mm-bootmem-try-harder-to-free-pages-in-bulk.patch
cgroups-add-res_counter_write_u64-api.patch
cgroups-new-resource-counter-inheritance-api.patch
cgroups-add-previous-cgroup-in-can_attach_task-attach_task-callbacks.patch
cgroups-new-cancel_attach_task-subsystem-callback.patch
cgroups-ability-to-stop-res-charge-propagation-on-bounded-ancestor.patch
cgroups-add-res-counter-common-ancestor-searching.patch
res_counter-allow-charge-failure-pointer-to-be-null.patch
cgroups-pull-up-res-counter-charge-failure-interpretation-to-caller.patch
cgroups-allow-subsystems-to-cancel-a-fork.patch
cgroups-add-a-task-counter-subsystem.patch
memcg-make-mem_cgroup_split_huge_fixup-more-efficient.patch
memcg-fix-pgpgin-pgpgout-documentation.patch
mm-page_cgroup-check-page_cgroup-arrays-in-lookup_page_cgroup-only-when-necessary.patch
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