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>
Cc: Tejun Heo <tj@xxxxxxxxxx>
Signed-off-by: Andrew Morton <akpm@xxxxxxxxxxxxxxxxxxxx>
---
mm/page_alloc.c | 35 +++++++++++++----------------------
1 file changed, 13 insertions(+), 22 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
@@ -743,32 +743,23 @@ 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 < (1 << order); loop++) {
- struct page *p = &page[loop];
-
- if (loop + 1 < (1 << order))
- prefetchw(p + 1);
- __ClearPageReserved(p);
- set_page_count(p, 0);
- }
-
- 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);
}
_
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
memcg-keep-root-group-unchanged-if-creation-fails.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
vmscan-add-task-name-to-warn_scan_unevictable-messages.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
mm-do-not-stall-in-synchronous-compaction-for-thp-allocations.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
page_cgroup-add-helper-function-to-get-swap_cgroup-cleanup.patch
memcg-clean-up-soft_limit_tree-if-allocation-fails.patch
oom-memcg-fix-exclusion-of-memcg-threads-after-they-have-detached-their-mm.patch
memcg-simplify-page-cache-charging.patch
memcg-simplify-corner-case-handling-of-lru.patch
memcg-clear-pc-mem_cgorup-if-necessary.patch
memcg-clear-pc-mem_cgorup-if-necessary-fix.patch
memcg-clear-pc-mem_cgorup-if-necessary-fix-2.patch
memcg-simplify-lru-handling-by-new-rule.patch
vmscan-trace-add-file-info-to-trace_mm_vmscan_lru_isolate.patch
revert-mm-do-not-stall-in-synchronous-compaction-for-thp-allocations.patch
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