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mm: introduce arch-specific vma flag VM_ARCH_1
Combine several arch-specific vma flags into one.
before patch:
0x00000200 0x01000000 0x20000000 0x40000000
x86 VM_NOHUGEPAGE VM_HUGEPAGE - VM_PAT
powerpc - - VM_SAO -
parisc VM_GROWSUP - - -
ia64 VM_GROWSUP - - -
nommu - VM_MAPPED_COPY - -
others - - - -
after patch:
0x00000200 0x01000000 0x20000000 0x40000000
x86 - VM_PAT VM_HUGEPAGE VM_NOHUGEPAGE
powerpc - VM_SAO - -
parisc - VM_GROWSUP - -
ia64 - VM_GROWSUP - -
nommu - VM_MAPPED_COPY - -
others - VM_ARCH_1 - -
And voila! One completely free bit.
Signed-off-by: Konstantin Khlebnikov <khlebnikov@openvz.org>
Cc: Alexander Viro <viro@zeniv.linux.org.uk>
Cc: Carsten Otte <cotte@de.ibm.com>
Cc: Chris Metcalf <cmetcalf@tilera.com>
Cc: Cyrill Gorcunov <gorcunov@openvz.org>
Cc: Eric Paris <eparis@redhat.com>
Cc: H. Peter Anvin <hpa@zytor.com>
Cc: Hugh Dickins <hughd@google.com>
Cc: Ingo Molnar <mingo@redhat.com>
Cc: James Morris <james.l.morris@oracle.com>
Cc: Jason Baron <jbaron@redhat.com>
Cc: Kentaro Takeda <takedakn@nttdata.co.jp>
Cc: Matt Helsley <matthltc@us.ibm.com>
Cc: Nick Piggin <npiggin@kernel.dk>
Cc: Oleg Nesterov <oleg@redhat.com>
Cc: Peter Zijlstra <a.p.zijlstra@chello.nl>
Cc: Robert Richter <robert.richter@amd.com>
Cc: Suresh Siddha <suresh.b.siddha@intel.com>
Cc: Tetsuo Handa <penguin-kernel@I-love.SAKURA.ne.jp>
Cc: Venkatesh Pallipadi <venki@google.com>
Acked-by: Linus Torvalds <torvalds@linux-foundation.org>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
This commit is contained in:
Konstantin Khlebnikov
Linus Torvalds
parent
b3b9c2932c
commit
cc2383ec06
3 changed files with 28 additions and 15 deletions
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@ -70,6 +70,8 @@ extern unsigned int kobjsize(const void *objp);
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/*
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* vm_flags in vm_area_struct, see mm_types.h.
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*/
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#define VM_NONE 0x00000000
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#define VM_READ 0x00000001 /* currently active flags */
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#define VM_WRITE 0x00000002
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#define VM_EXEC 0x00000004
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@ -82,12 +84,6 @@ extern unsigned int kobjsize(const void *objp);
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#define VM_MAYSHARE 0x00000080
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#define VM_GROWSDOWN 0x00000100 /* general info on the segment */
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#if defined(CONFIG_STACK_GROWSUP) || defined(CONFIG_IA64)
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#define VM_GROWSUP 0x00000200
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#else
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#define VM_GROWSUP 0x00000000
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#define VM_NOHUGEPAGE 0x00000200 /* MADV_NOHUGEPAGE marked this vma */
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#endif
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#define VM_PFNMAP 0x00000400 /* Page-ranges managed without "struct page", just pure PFN */
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#define VM_DENYWRITE 0x00000800 /* ETXTBSY on write attempts.. */
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@ -106,20 +102,32 @@ extern unsigned int kobjsize(const void *objp);
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#define VM_NORESERVE 0x00200000 /* should the VM suppress accounting */
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#define VM_HUGETLB 0x00400000 /* Huge TLB Page VM */
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#define VM_NONLINEAR 0x00800000 /* Is non-linear (remap_file_pages) */
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#ifndef CONFIG_TRANSPARENT_HUGEPAGE
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#define VM_MAPPED_COPY 0x01000000 /* T if mapped copy of data (nommu mmap) */
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#else
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#define VM_HUGEPAGE 0x01000000 /* MADV_HUGEPAGE marked this vma */
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#endif
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#define VM_ARCH_1 0x01000000 /* Architecture-specific flag */
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#define VM_INSERTPAGE 0x02000000 /* The vma has had "vm_insert_page()" done on it */
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#define VM_NODUMP 0x04000000 /* Do not include in the core dump */
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#define VM_CAN_NONLINEAR 0x08000000 /* Has ->fault & does nonlinear pages */
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#define VM_MIXEDMAP 0x10000000 /* Can contain "struct page" and pure PFN pages */
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#define VM_SAO 0x20000000 /* Strong Access Ordering (powerpc) */
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#define VM_PAT 0x40000000 /* PAT reserves whole VMA at once (x86) */
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#define VM_HUGEPAGE 0x20000000 /* MADV_HUGEPAGE marked this vma */
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#define VM_NOHUGEPAGE 0x40000000 /* MADV_NOHUGEPAGE marked this vma */
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#define VM_MERGEABLE 0x80000000 /* KSM may merge identical pages */
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#if defined(CONFIG_X86)
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# define VM_PAT VM_ARCH_1 /* PAT reserves whole VMA at once (x86) */
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#elif defined(CONFIG_PPC)
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# define VM_SAO VM_ARCH_1 /* Strong Access Ordering (powerpc) */
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#elif defined(CONFIG_PARISC)
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# define VM_GROWSUP VM_ARCH_1
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#elif defined(CONFIG_IA64)
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# define VM_GROWSUP VM_ARCH_1
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#elif !defined(CONFIG_MMU)
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# define VM_MAPPED_COPY VM_ARCH_1 /* T if mapped copy of data (nommu mmap) */
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#endif
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#ifndef VM_GROWSUP
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# define VM_GROWSUP VM_NONE
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#endif
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/* Bits set in the VMA until the stack is in its final location */
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#define VM_STACK_INCOMPLETE_SETUP (VM_RAND_READ | VM_SEQ_READ)
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@ -1491,7 +1491,7 @@ out:
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return ret;
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}
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#define VM_NO_THP (VM_SPECIAL|VM_INSERTPAGE|VM_MIXEDMAP|VM_SAO| \
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#define VM_NO_THP (VM_SPECIAL|VM_INSERTPAGE|VM_MIXEDMAP| \
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VM_HUGETLB|VM_SHARED|VM_MAYSHARE)
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int hugepage_madvise(struct vm_area_struct *vma,
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7
mm/ksm.c
7
mm/ksm.c
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@ -1470,9 +1470,14 @@ int ksm_madvise(struct vm_area_struct *vma, unsigned long start,
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if (*vm_flags & (VM_MERGEABLE | VM_SHARED | VM_MAYSHARE |
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VM_PFNMAP | VM_IO | VM_DONTEXPAND |
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VM_RESERVED | VM_HUGETLB | VM_INSERTPAGE |
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VM_NONLINEAR | VM_MIXEDMAP | VM_SAO))
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VM_NONLINEAR | VM_MIXEDMAP))
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return 0; /* just ignore the advice */
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#ifdef VM_SAO
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if (*vm_flags & VM_SAO)
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return 0;
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#endif
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if (!test_bit(MMF_VM_MERGEABLE, &mm->flags)) {
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err = __ksm_enter(mm);
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if (err)
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