From: aarcange@redhat.com
To: linux-mm@kvack.org
Cc: Andrea Arcangeli <aarcange@redhat.com>, Rik van Riel <riel@redhat.com>
Subject: [patch 13/35] special pmd_trans_* functions
Date: Fri, 26 Feb 2010 21:04:46 +0100 [thread overview]
Message-ID: <20100226200900.921843355@redhat.com> (raw)
In-Reply-To: 20100226200433.516502198@redhat.com
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[-- Type: text/plain, Size: 2663 bytes --]
From: Andrea Arcangeli <aarcange@redhat.com>
These returns 0 at compile time when the config option is disabled, to allow
gcc to eliminate the transparent hugepage function calls at compile time
without additional #ifdefs (only the export of those functions have to be
visible to gcc but they won't be required at link time and huge_memory.o can be
not built at all).
_PAGE_BIT_UNUSED1 is never used for pmd, only on pte.
Signed-off-by: Andrea Arcangeli <aarcange@redhat.com>
Acked-by: Rik van Riel <riel@redhat.com>
---
arch/x86/include/asm/pgtable_64.h | 13 +++++++++++++
arch/x86/include/asm/pgtable_types.h | 2 ++
include/asm-generic/pgtable.h | 5 +++++
3 files changed, 20 insertions(+)
--- a/arch/x86/include/asm/pgtable_64.h
+++ b/arch/x86/include/asm/pgtable_64.h
@@ -168,6 +168,19 @@ extern void cleanup_highmap(void);
#define kc_offset_to_vaddr(o) ((o) | ~__VIRTUAL_MASK)
#define __HAVE_ARCH_PTE_SAME
+
+#ifdef CONFIG_TRANSPARENT_HUGEPAGE
+static inline int pmd_trans_splitting(pmd_t pmd)
+{
+ return pmd_val(pmd) & _PAGE_SPLITTING;
+}
+
+static inline int pmd_trans_huge(pmd_t pmd)
+{
+ return pmd_val(pmd) & _PAGE_PSE;
+}
+#endif /* CONFIG_TRANSPARENT_HUGEPAGE */
+
#endif /* !__ASSEMBLY__ */
#endif /* _ASM_X86_PGTABLE_64_H */
--- a/arch/x86/include/asm/pgtable_types.h
+++ b/arch/x86/include/asm/pgtable_types.h
@@ -22,6 +22,7 @@
#define _PAGE_BIT_PAT_LARGE 12 /* On 2MB or 1GB pages */
#define _PAGE_BIT_SPECIAL _PAGE_BIT_UNUSED1
#define _PAGE_BIT_CPA_TEST _PAGE_BIT_UNUSED1
+#define _PAGE_BIT_SPLITTING _PAGE_BIT_UNUSED1 /* only valid on a PSE pmd */
#define _PAGE_BIT_NX 63 /* No execute: only valid after cpuid check */
/* If _PAGE_BIT_PRESENT is clear, we use these: */
@@ -45,6 +46,7 @@
#define _PAGE_PAT_LARGE (_AT(pteval_t, 1) << _PAGE_BIT_PAT_LARGE)
#define _PAGE_SPECIAL (_AT(pteval_t, 1) << _PAGE_BIT_SPECIAL)
#define _PAGE_CPA_TEST (_AT(pteval_t, 1) << _PAGE_BIT_CPA_TEST)
+#define _PAGE_SPLITTING (_AT(pteval_t, 1) << _PAGE_BIT_SPLITTING)
#define __HAVE_ARCH_PTE_SPECIAL
#ifdef CONFIG_KMEMCHECK
--- a/include/asm-generic/pgtable.h
+++ b/include/asm-generic/pgtable.h
@@ -344,6 +344,11 @@ extern void untrack_pfn_vma(struct vm_ar
unsigned long size);
#endif
+#ifndef CONFIG_TRANSPARENT_HUGEPAGE
+#define pmd_trans_huge(pmd) 0
+#define pmd_trans_splitting(pmd) 0
+#endif
+
#endif /* !__ASSEMBLY__ */
#endif /* _ASM_GENERIC_PGTABLE_H */
--
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next prev parent reply other threads:[~2010-02-26 20:09 UTC|newest]
Thread overview: 37+ messages / expand[flat|nested] mbox.gz Atom feed top
2010-02-26 20:04 [patch 00/35] Transparent Hugepage support #12 aarcange
2010-02-26 20:04 ` [patch 01/35] define MADV_HUGEPAGE aarcange
2010-02-26 20:04 ` [patch 02/35] compound_lock aarcange
2010-02-26 20:04 ` [patch 03/35] alter compound get_page/put_page aarcange
2010-02-26 20:04 ` [patch 04/35] update futex compound knowledge aarcange
2010-02-26 20:04 ` [patch 05/35] fix bad_page to show the real reason the page is bad aarcange
2010-02-26 20:04 ` [patch 06/35] clear compound mapping aarcange
2010-02-26 20:04 ` [patch 07/35] add native_set_pmd_at aarcange
2010-02-26 20:04 ` [patch 08/35] add pmd paravirt ops aarcange
2010-02-26 20:04 ` [patch 09/35] no paravirt version of pmd ops aarcange
2010-02-26 20:04 ` [patch 10/35] export maybe_mkwrite aarcange
2010-02-26 20:04 ` [patch 11/35] comment reminder in destroy_compound_page aarcange
2010-02-26 20:04 ` [patch 12/35] config_transparent_hugepage aarcange
2010-02-26 20:04 ` aarcange [this message]
2010-02-26 20:04 ` [patch 14/35] add pmd mangling generic functions aarcange
2010-02-26 20:04 ` [patch 15/35] add pmd mangling functions to x86 aarcange
2010-02-26 20:04 ` [patch 16/35] bail out gup_fast on splitting pmd aarcange
2010-02-26 20:04 ` [patch 17/35] pte alloc trans splitting aarcange
2010-02-26 20:04 ` [patch 18/35] add pmd mmu_notifier helpers aarcange
2010-02-26 20:04 ` [patch 19/35] clear page compound aarcange
2010-02-26 20:04 ` [patch 20/35] add pmd_huge_pte to mm_struct aarcange
2010-02-26 20:04 ` [patch 21/35] split_huge_page_mm/vma aarcange
2010-02-26 20:04 ` [patch 22/35] split_huge_page paging aarcange
2010-02-26 20:04 ` [patch 23/35] clear_copy_huge_page aarcange
2010-02-26 20:04 ` [patch 24/35] kvm mmu transparent hugepage support aarcange
2010-02-26 20:04 ` [patch 25/35] _GFP_NO_KSWAPD aarcange
2010-02-26 20:04 ` [patch 26/35] dont alloc harder for gfp nomemalloc even if nowait aarcange
2010-02-26 20:05 ` [patch 27/35] transparent hugepage core aarcange
2010-02-26 20:05 ` [patch 28/35] adapt to mm_counter in -mm aarcange
2010-02-26 20:05 ` [patch 29/35] verify pmd_trans_huge isnt leaking aarcange
2010-02-26 20:05 ` [patch 30/35] madvise(MADV_HUGEPAGE) aarcange
2010-02-26 20:05 ` [patch 31/35] pmd_trans_huge migrate bugcheck aarcange
2010-02-26 20:05 ` [patch 32/35] memcg compound aarcange
2010-02-26 20:05 ` [patch 33/35] memcg huge memory aarcange
2010-02-26 20:05 ` [patch 34/35] transparent hugepage vmstat aarcange
2010-02-26 20:05 ` [patch 35/35] khugepaged aarcange
-- strict thread matches above, loose matches on Subject: below --
2010-03-09 19:39 [patch 00/35] Transparent Hugepage support #13 aarcange
2010-03-09 19:39 ` [patch 13/35] special pmd_trans_* functions aarcange
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