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mm/debug-pagealloc: make debug-pagealloc boottime configurable
Now, we have prepared to avoid using debug-pagealloc in boottime. So introduce new kernel-parameter to disable debug-pagealloc in boottime, and makes related functions to be disabled in this case. Only non-intuitive part is change of guard page functions. Because guard page is effective only if debug-pagealloc is enabled, turning off according to debug-pagealloc is reasonable thing to do. Signed-off-by: Joonsoo Kim <iamjoonsoo.kim@lge.com> Cc: Mel Gorman <mgorman@suse.de> Cc: Johannes Weiner <hannes@cmpxchg.org> Cc: Minchan Kim <minchan@kernel.org> Cc: Dave Hansen <dave@sr71.net> Cc: Michal Nazarewicz <mina86@mina86.com> Cc: Jungsoo Son <jungsoo.son@lge.com> Cc: Ingo Molnar <mingo@redhat.com> Cc: Joonsoo Kim <iamjoonsoo.kim@lge.com> Signed-off-by: Andrew Morton <akpm@linux-foundation.org> Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
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@ -829,6 +829,15 @@ bytes respectively. Such letter suffixes can also be entirely omitted.
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CONFIG_DEBUG_PAGEALLOC, hence this option will not help
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CONFIG_DEBUG_PAGEALLOC, hence this option will not help
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tracking down these problems.
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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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on: enable the feature
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debugpat [X86] Enable PAT debugging
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debugpat [X86] Enable PAT debugging
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decnet.addr= [HW,NET]
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decnet.addr= [HW,NET]
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@ -1514,7 +1514,7 @@ static void kernel_unmap_linear_page(unsigned long vaddr, unsigned long lmi)
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mmu_kernel_ssize, 0);
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mmu_kernel_ssize, 0);
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}
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}
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void kernel_map_pages(struct page *page, int numpages, int enable)
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void __kernel_map_pages(struct page *page, int numpages, int enable)
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{
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{
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unsigned long flags, vaddr, lmi;
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unsigned long flags, vaddr, lmi;
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int i;
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int i;
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@ -429,7 +429,7 @@ static int change_page_attr(struct page *page, int numpages, pgprot_t prot)
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}
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}
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void kernel_map_pages(struct page *page, int numpages, int enable)
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void __kernel_map_pages(struct page *page, int numpages, int enable)
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{
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{
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if (PageHighMem(page))
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if (PageHighMem(page))
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return;
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return;
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@ -120,7 +120,7 @@ static void ipte_range(pte_t *pte, unsigned long address, int nr)
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}
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}
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}
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}
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void kernel_map_pages(struct page *page, int numpages, int enable)
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void __kernel_map_pages(struct page *page, int numpages, int enable)
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{
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{
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unsigned long address;
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unsigned long address;
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int nr, i, j;
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int nr, i, j;
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@ -1621,7 +1621,7 @@ static void __init kernel_physical_mapping_init(void)
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}
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}
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#ifdef CONFIG_DEBUG_PAGEALLOC
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#ifdef CONFIG_DEBUG_PAGEALLOC
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void kernel_map_pages(struct page *page, int numpages, int enable)
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void __kernel_map_pages(struct page *page, int numpages, int enable)
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{
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{
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unsigned long phys_start = page_to_pfn(page) << PAGE_SHIFT;
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unsigned long phys_start = page_to_pfn(page) << PAGE_SHIFT;
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unsigned long phys_end = phys_start + (numpages * PAGE_SIZE);
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unsigned long phys_end = phys_start + (numpages * PAGE_SIZE);
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@ -1817,7 +1817,7 @@ static int __set_pages_np(struct page *page, int numpages)
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return __change_page_attr_set_clr(&cpa, 0);
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return __change_page_attr_set_clr(&cpa, 0);
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}
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}
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void kernel_map_pages(struct page *page, int numpages, int enable)
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void __kernel_map_pages(struct page *page, int numpages, int enable)
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{
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{
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if (PageHighMem(page))
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if (PageHighMem(page))
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return;
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return;
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@ -2061,7 +2061,22 @@ static inline void vm_stat_account(struct mm_struct *mm,
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#endif /* CONFIG_PROC_FS */
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#endif /* CONFIG_PROC_FS */
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#ifdef CONFIG_DEBUG_PAGEALLOC
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#ifdef CONFIG_DEBUG_PAGEALLOC
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extern void kernel_map_pages(struct page *page, int numpages, int enable);
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extern bool _debug_pagealloc_enabled;
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extern void __kernel_map_pages(struct page *page, int numpages, int enable);
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static inline bool debug_pagealloc_enabled(void)
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{
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return _debug_pagealloc_enabled;
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}
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static inline void
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kernel_map_pages(struct page *page, int numpages, int enable)
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{
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if (!debug_pagealloc_enabled())
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return;
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__kernel_map_pages(page, numpages, enable);
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}
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#ifdef CONFIG_HIBERNATION
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#ifdef CONFIG_HIBERNATION
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extern bool kernel_page_present(struct page *page);
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extern bool kernel_page_present(struct page *page);
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#endif /* CONFIG_HIBERNATION */
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#endif /* CONFIG_HIBERNATION */
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@ -10,11 +10,17 @@ static bool page_poisoning_enabled __read_mostly;
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static bool need_page_poisoning(void)
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static bool need_page_poisoning(void)
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{
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{
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if (!debug_pagealloc_enabled())
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return false;
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return true;
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return true;
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}
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}
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static void init_page_poisoning(void)
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static void init_page_poisoning(void)
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{
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{
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if (!debug_pagealloc_enabled())
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return;
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page_poisoning_enabled = true;
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page_poisoning_enabled = true;
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}
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}
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@ -119,7 +125,7 @@ static void unpoison_pages(struct page *page, int n)
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unpoison_page(page + i);
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unpoison_page(page + i);
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}
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}
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void kernel_map_pages(struct page *page, int numpages, int enable)
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void __kernel_map_pages(struct page *page, int numpages, int enable)
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{
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{
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if (!page_poisoning_enabled)
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if (!page_poisoning_enabled)
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return;
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return;
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@ -425,15 +425,35 @@ static inline void prep_zero_page(struct page *page, unsigned int order,
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#ifdef CONFIG_DEBUG_PAGEALLOC
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#ifdef CONFIG_DEBUG_PAGEALLOC
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unsigned int _debug_guardpage_minorder;
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unsigned int _debug_guardpage_minorder;
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bool _debug_pagealloc_enabled __read_mostly;
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bool _debug_guardpage_enabled __read_mostly;
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bool _debug_guardpage_enabled __read_mostly;
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static int __init early_debug_pagealloc(char *buf)
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{
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if (!buf)
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return -EINVAL;
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if (strcmp(buf, "on") == 0)
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_debug_pagealloc_enabled = true;
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return 0;
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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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static bool need_debug_guardpage(void)
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{
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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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return true;
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return true;
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}
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}
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static void init_debug_guardpage(void)
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static void init_debug_guardpage(void)
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{
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{
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if (!debug_pagealloc_enabled())
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return;
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_debug_guardpage_enabled = true;
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_debug_guardpage_enabled = true;
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}
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}
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