mm, debug_pagealloc: use a page type instead of page_ext flag
When debug_pagealloc is enabled, we currently allocate the page_ext array to mark guard pages with the PAGE_EXT_DEBUG_GUARD flag. Now that we have the page_type field in struct page, we can use that instead, as guard pages are neither PageSlab nor mapped to userspace. This reduces memory overhead when debug_pagealloc is enabled and there are no other features requiring the page_ext array. Link: http://lkml.kernel.org/r/20190603143451.27353-4-vbabka@suse.cz Signed-off-by: Vlastimil Babka <vbabka@suse.cz> Cc: Joonsoo Kim <iamjoonsoo.kim@lge.com> Cc: Matthew Wilcox <willy@infradead.org> Cc: "Kirill A. Shutemov" <kirill.shutemov@linux.intel.com> Cc: Mel Gorman <mgorman@techsingularity.net> Cc: Michal Hocko <mhocko@kernel.org> Signed-off-by: Andrew Morton <akpm@linux-foundation.org> Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
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@ -805,12 +805,10 @@
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tracking down these problems.
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debug_pagealloc=
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[KNL] When CONFIG_DEBUG_PAGEALLOC is set, this
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parameter enables the feature at boot time. In
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default, it is disabled. We can avoid allocating huge
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chunk of memory for debug pagealloc if we don't enable
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it at boot time and the system will work mostly same
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with the kernel built without CONFIG_DEBUG_PAGEALLOC.
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[KNL] When CONFIG_DEBUG_PAGEALLOC is set, this parameter
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enables the feature at boot time. By default, it is
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disabled and the system will work mostly the same as a
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kernel built without CONFIG_DEBUG_PAGEALLOC.
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on: enable the feature
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debugpat [X86] Enable PAT debugging
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@ -2862,8 +2862,6 @@ extern long copy_huge_page_from_user(struct page *dst_page,
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bool allow_pagefault);
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#endif /* CONFIG_TRANSPARENT_HUGEPAGE || CONFIG_HUGETLBFS */
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extern struct page_ext_operations debug_guardpage_ops;
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#ifdef CONFIG_DEBUG_PAGEALLOC
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extern unsigned int _debug_guardpage_minorder;
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DECLARE_STATIC_KEY_FALSE(_debug_guardpage_enabled);
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@ -2880,16 +2878,10 @@ static inline bool debug_guardpage_enabled(void)
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static inline bool page_is_guard(struct page *page)
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{
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struct page_ext *page_ext;
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if (!debug_guardpage_enabled())
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return false;
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page_ext = lookup_page_ext(page);
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if (unlikely(!page_ext))
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return false;
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return test_bit(PAGE_EXT_DEBUG_GUARD, &page_ext->flags);
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return PageGuard(page);
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}
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#else
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static inline unsigned int debug_guardpage_minorder(void) { return 0; }
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@ -703,6 +703,7 @@ PAGEFLAG_FALSE(DoubleMap)
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#define PG_offline 0x00000100
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#define PG_kmemcg 0x00000200
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#define PG_table 0x00000400
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#define PG_guard 0x00000800
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#define PageType(page, flag) \
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((page->page_type & (PAGE_TYPE_BASE | flag)) == PAGE_TYPE_BASE)
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@ -754,6 +755,11 @@ PAGE_TYPE_OPS(Kmemcg, kmemcg)
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*/
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PAGE_TYPE_OPS(Table, table)
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/*
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* Marks guardpages used with debug_pagealloc.
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*/
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PAGE_TYPE_OPS(Guard, guard)
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extern bool is_free_buddy_page(struct page *page);
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__PAGEFLAG(Isolated, isolated, PF_ANY);
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@ -17,7 +17,6 @@ struct page_ext_operations {
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#ifdef CONFIG_PAGE_EXTENSION
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enum page_ext_flags {
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PAGE_EXT_DEBUG_GUARD,
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PAGE_EXT_OWNER,
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#if defined(CONFIG_IDLE_PAGE_TRACKING) && !defined(CONFIG_64BIT)
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PAGE_EXT_YOUNG,
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@ -12,7 +12,6 @@ config DEBUG_PAGEALLOC
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bool "Debug page memory allocations"
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depends on DEBUG_KERNEL
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depends on !HIBERNATION || ARCH_SUPPORTS_DEBUG_PAGEALLOC && !PPC && !SPARC
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select PAGE_EXTENSION
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select PAGE_POISONING if !ARCH_SUPPORTS_DEBUG_PAGEALLOC
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---help---
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Unmap pages from the kernel linear mapping after free_pages().
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@ -50,7 +50,6 @@
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#include <linux/backing-dev.h>
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#include <linux/fault-inject.h>
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#include <linux/page-isolation.h>
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#include <linux/page_ext.h>
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#include <linux/debugobjects.h>
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#include <linux/kmemleak.h>
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#include <linux/compaction.h>
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@ -668,18 +667,6 @@ static int __init early_debug_pagealloc(char *buf)
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}
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early_param("debug_pagealloc", early_debug_pagealloc);
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static bool need_debug_guardpage(void)
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{
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/* If we don't use debug_pagealloc, we don't need guard page */
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if (!debug_pagealloc_enabled())
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return false;
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if (!debug_guardpage_minorder())
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return false;
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return true;
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}
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static void init_debug_guardpage(void)
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{
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if (!debug_pagealloc_enabled())
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@ -691,11 +678,6 @@ static void init_debug_guardpage(void)
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static_branch_enable(&_debug_guardpage_enabled);
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}
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struct page_ext_operations debug_guardpage_ops = {
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.need = need_debug_guardpage,
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.init = init_debug_guardpage,
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};
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static int __init debug_guardpage_minorder_setup(char *buf)
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{
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unsigned long res;
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@ -713,20 +695,13 @@ early_param("debug_guardpage_minorder", debug_guardpage_minorder_setup);
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static inline bool set_page_guard(struct zone *zone, struct page *page,
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unsigned int order, int migratetype)
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{
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struct page_ext *page_ext;
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if (!debug_guardpage_enabled())
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return false;
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if (order >= debug_guardpage_minorder())
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return false;
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page_ext = lookup_page_ext(page);
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if (unlikely(!page_ext))
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return false;
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__set_bit(PAGE_EXT_DEBUG_GUARD, &page_ext->flags);
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__SetPageGuard(page);
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INIT_LIST_HEAD(&page->lru);
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set_page_private(page, order);
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/* Guard pages are not available for any usage */
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@ -738,23 +713,16 @@ static inline bool set_page_guard(struct zone *zone, struct page *page,
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static inline void clear_page_guard(struct zone *zone, struct page *page,
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unsigned int order, int migratetype)
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{
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struct page_ext *page_ext;
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if (!debug_guardpage_enabled())
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return;
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page_ext = lookup_page_ext(page);
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if (unlikely(!page_ext))
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return;
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__clear_bit(PAGE_EXT_DEBUG_GUARD, &page_ext->flags);
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__ClearPageGuard(page);
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set_page_private(page, 0);
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if (!is_migrate_isolate(migratetype))
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__mod_zone_freepage_state(zone, (1 << order), migratetype);
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}
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#else
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struct page_ext_operations debug_guardpage_ops;
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static inline bool set_page_guard(struct zone *zone, struct page *page,
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unsigned int order, int migratetype) { return false; }
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static inline void clear_page_guard(struct zone *zone, struct page *page,
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@ -1930,6 +1898,10 @@ void __init page_alloc_init_late(void)
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for_each_populated_zone(zone)
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set_zone_contiguous(zone);
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#ifdef CONFIG_DEBUG_PAGEALLOC
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init_debug_guardpage();
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#endif
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}
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#ifdef CONFIG_CMA
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@ -59,9 +59,6 @@
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*/
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static struct page_ext_operations *page_ext_ops[] = {
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#ifdef CONFIG_DEBUG_PAGEALLOC
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&debug_guardpage_ops,
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#endif
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#ifdef CONFIG_PAGE_OWNER
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&page_owner_ops,
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#endif
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