769848c038
It is often known at allocation time whether a page may be migrated or not. This patch adds a flag called __GFP_MOVABLE and a new mask called GFP_HIGH_MOVABLE. Allocations using the __GFP_MOVABLE can be either migrated using the page migration mechanism or reclaimed by syncing with backing storage and discarding. An API function very similar to alloc_zeroed_user_highpage() is added for __GFP_MOVABLE allocations called alloc_zeroed_user_highpage_movable(). The flags used by alloc_zeroed_user_highpage() are not changed because it would change the semantics of an existing API. After this patch is applied there are no in-kernel users of alloc_zeroed_user_highpage() so it probably should be marked deprecated if this patch is merged. Note that this patch includes a minor cleanup to the use of __GFP_ZERO in shmem.c to keep all flag modifications to inode->mapping in the shmem_dir_alloc() helper function. This clean-up suggestion is courtesy of Hugh Dickens. Additional credit goes to Christoph Lameter and Linus Torvalds for shaping the concept. Credit to Hugh Dickens for catching issues with shmem swap vector and ramfs allocations. [akpm@linux-foundation.org: build fix] [hugh@veritas.com: __GFP_ZERO cleanup] Signed-off-by: Mel Gorman <mel@csn.ul.ie> Cc: Andy Whitcroft <apw@shadowen.org> Cc: Christoph Lameter <clameter@sgi.com> Signed-off-by: Andrew Morton <akpm@linux-foundation.org> Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
173 lines
4.3 KiB
C
173 lines
4.3 KiB
C
/*
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* include/asm-s390/page.h
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*
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* S390 version
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* Copyright (C) 1999,2000 IBM Deutschland Entwicklung GmbH, IBM Corporation
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* Author(s): Hartmut Penner (hp@de.ibm.com)
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*/
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#ifndef _S390_PAGE_H
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#define _S390_PAGE_H
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#include <asm/types.h>
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/* PAGE_SHIFT determines the page size */
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#define PAGE_SHIFT 12
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#define PAGE_SIZE (1UL << PAGE_SHIFT)
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#define PAGE_MASK (~(PAGE_SIZE-1))
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#define PAGE_DEFAULT_ACC 0
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#define PAGE_DEFAULT_KEY (PAGE_DEFAULT_ACC << 4)
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#ifdef __KERNEL__
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#include <asm/setup.h>
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#ifndef __ASSEMBLY__
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static inline void clear_page(void *page)
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{
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register unsigned long reg1 asm ("1") = 0;
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register void *reg2 asm ("2") = page;
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register unsigned long reg3 asm ("3") = 4096;
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asm volatile(
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" mvcl 2,0"
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: "+d" (reg2), "+d" (reg3) : "d" (reg1) : "memory", "cc");
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}
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static inline void copy_page(void *to, void *from)
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{
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if (MACHINE_HAS_MVPG) {
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register unsigned long reg0 asm ("0") = 0;
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asm volatile(
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" mvpg %0,%1"
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: : "a" (to), "a" (from), "d" (reg0)
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: "memory", "cc");
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} else
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asm volatile(
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" mvc 0(256,%0),0(%1)\n"
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" mvc 256(256,%0),256(%1)\n"
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" mvc 512(256,%0),512(%1)\n"
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" mvc 768(256,%0),768(%1)\n"
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" mvc 1024(256,%0),1024(%1)\n"
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" mvc 1280(256,%0),1280(%1)\n"
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" mvc 1536(256,%0),1536(%1)\n"
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" mvc 1792(256,%0),1792(%1)\n"
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" mvc 2048(256,%0),2048(%1)\n"
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" mvc 2304(256,%0),2304(%1)\n"
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" mvc 2560(256,%0),2560(%1)\n"
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" mvc 2816(256,%0),2816(%1)\n"
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" mvc 3072(256,%0),3072(%1)\n"
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" mvc 3328(256,%0),3328(%1)\n"
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" mvc 3584(256,%0),3584(%1)\n"
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" mvc 3840(256,%0),3840(%1)\n"
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: : "a" (to), "a" (from) : "memory");
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}
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#define clear_user_page(page, vaddr, pg) clear_page(page)
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#define copy_user_page(to, from, vaddr, pg) copy_page(to, from)
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#define __alloc_zeroed_user_highpage(movableflags, vma, vaddr) \
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alloc_page_vma(GFP_HIGHUSER | __GFP_ZERO | movableflags, vma, vaddr)
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#define __HAVE_ARCH_ALLOC_ZEROED_USER_HIGHPAGE
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/*
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* These are used to make use of C type-checking..
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*/
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typedef struct { unsigned long pgprot; } pgprot_t;
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typedef struct { unsigned long pte; } pte_t;
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#define pte_val(x) ((x).pte)
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#define pgprot_val(x) ((x).pgprot)
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#ifndef __s390x__
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typedef struct { unsigned long pmd; } pmd_t;
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typedef struct {
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unsigned long pgd0;
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unsigned long pgd1;
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unsigned long pgd2;
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unsigned long pgd3;
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} pgd_t;
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#define pmd_val(x) ((x).pmd)
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#define pgd_val(x) ((x).pgd0)
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#else /* __s390x__ */
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typedef struct {
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unsigned long pmd0;
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unsigned long pmd1;
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} pmd_t;
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typedef struct { unsigned long pgd; } pgd_t;
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#define pmd_val(x) ((x).pmd0)
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#define pmd_val1(x) ((x).pmd1)
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#define pgd_val(x) ((x).pgd)
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#endif /* __s390x__ */
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#define __pte(x) ((pte_t) { (x) } )
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#define __pmd(x) ((pmd_t) { (x) } )
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#define __pgd(x) ((pgd_t) { (x) } )
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#define __pgprot(x) ((pgprot_t) { (x) } )
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/* default storage key used for all pages */
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extern unsigned int default_storage_key;
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static inline void
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page_set_storage_key(unsigned long addr, unsigned int skey)
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{
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asm volatile("sske %0,%1" : : "d" (skey), "a" (addr));
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}
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static inline unsigned int
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page_get_storage_key(unsigned long addr)
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{
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unsigned int skey;
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asm volatile("iske %0,%1" : "=d" (skey) : "a" (addr), "0" (0));
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return skey;
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}
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extern unsigned long max_pfn;
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static inline int pfn_valid(unsigned long pfn)
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{
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unsigned long dummy;
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int ccode;
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if (pfn >= max_pfn)
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return 0;
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asm volatile(
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" lra %0,0(%2)\n"
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" ipm %1\n"
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" srl %1,28\n"
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: "=d" (dummy), "=d" (ccode)
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: "a" (pfn << PAGE_SHIFT)
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: "cc");
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return !ccode;
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}
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#endif /* !__ASSEMBLY__ */
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/* to align the pointer to the (next) page boundary */
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#define PAGE_ALIGN(addr) (((addr)+PAGE_SIZE-1)&PAGE_MASK)
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#define __PAGE_OFFSET 0x0UL
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#define PAGE_OFFSET 0x0UL
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#define __pa(x) (unsigned long)(x)
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#define __va(x) (void *)(unsigned long)(x)
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#define virt_to_page(kaddr) pfn_to_page(__pa(kaddr) >> PAGE_SHIFT)
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#define page_to_phys(page) (page_to_pfn(page) << PAGE_SHIFT)
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#define virt_addr_valid(kaddr) pfn_valid(__pa(kaddr) >> PAGE_SHIFT)
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#define VM_DATA_DEFAULT_FLAGS (VM_READ | VM_WRITE | VM_EXEC | \
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VM_MAYREAD | VM_MAYWRITE | VM_MAYEXEC)
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#include <asm-generic/memory_model.h>
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#include <asm-generic/page.h>
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#endif /* __KERNEL__ */
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#endif /* _S390_PAGE_H */
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