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0e5c9f39f6
I don't think we need to call hugetlb_clean_stale_pgtable() anymore
in 2.6.13 because of the rework with free_pgtables(). It now collect
all the pte page at the time of munmap. It used to only collect page
table pages when entire one pgd can be freed and left with staled pte
pages. Not anymore with 2.6.13. This function will never be called
and We should turn it into a BUG_ON.
I also spotted two problems here, not Adam's fault :-)
(1) in huge_pte_alloc(), it looks like a bug to me that pud is not
checked before calling pmd_alloc()
(2) in hugetlb_clean_stale_pgtable(), it also missed a call to
pmd_free_tlb. I think a tlb flush is required to flush the mapping
for the page table itself when we clear out the pmd pointing to a
pte page. However, since hugetlb_clean_stale_pgtable() is never
called, so it won't trigger the bug.
Signed-off-by: Ken Chen <kenneth.w.chen@intel.com>
Cc: Adam Litke <agl@us.ibm.com>
Signed-off-by: Andrew Morton <akpm@osdl.org>
Signed-off-by: Linus Torvalds <torvalds@osdl.org>
167 lines
5.0 KiB
C
167 lines
5.0 KiB
C
#ifndef _LINUX_HUGETLB_H
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#define _LINUX_HUGETLB_H
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#ifdef CONFIG_HUGETLB_PAGE
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#include <linux/mempolicy.h>
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#include <asm/tlbflush.h>
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struct ctl_table;
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static inline int is_vm_hugetlb_page(struct vm_area_struct *vma)
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{
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return vma->vm_flags & VM_HUGETLB;
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}
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int hugetlb_sysctl_handler(struct ctl_table *, int, struct file *, void __user *, size_t *, loff_t *);
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int copy_hugetlb_page_range(struct mm_struct *, struct mm_struct *, struct vm_area_struct *);
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int follow_hugetlb_page(struct mm_struct *, struct vm_area_struct *, struct page **, struct vm_area_struct **, unsigned long *, int *, int);
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void zap_hugepage_range(struct vm_area_struct *, unsigned long, unsigned long);
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void unmap_hugepage_range(struct vm_area_struct *, unsigned long, unsigned long);
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int hugetlb_prefault(struct address_space *, struct vm_area_struct *);
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int hugetlb_report_meminfo(char *);
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int hugetlb_report_node_meminfo(int, char *);
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int is_hugepage_mem_enough(size_t);
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unsigned long hugetlb_total_pages(void);
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struct page *alloc_huge_page(void);
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void free_huge_page(struct page *);
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extern unsigned long max_huge_pages;
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extern const unsigned long hugetlb_zero, hugetlb_infinity;
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extern int sysctl_hugetlb_shm_group;
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/* arch callbacks */
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pte_t *huge_pte_alloc(struct mm_struct *mm, unsigned long addr);
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pte_t *huge_pte_offset(struct mm_struct *mm, unsigned long addr);
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struct page *follow_huge_addr(struct mm_struct *mm, unsigned long address,
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int write);
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struct page *follow_huge_pmd(struct mm_struct *mm, unsigned long address,
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pmd_t *pmd, int write);
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int is_aligned_hugepage_range(unsigned long addr, unsigned long len);
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int pmd_huge(pmd_t pmd);
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#ifndef ARCH_HAS_HUGEPAGE_ONLY_RANGE
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#define is_hugepage_only_range(mm, addr, len) 0
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#define hugetlb_free_pgd_range(tlb, addr, end, floor, ceiling) \
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do { } while (0)
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#endif
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#ifndef ARCH_HAS_PREPARE_HUGEPAGE_RANGE
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#define prepare_hugepage_range(addr, len) \
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is_aligned_hugepage_range(addr, len)
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#else
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int prepare_hugepage_range(unsigned long addr, unsigned long len);
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#endif
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#ifndef ARCH_HAS_SETCLEAR_HUGE_PTE
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#define set_huge_pte_at(mm, addr, ptep, pte) set_pte_at(mm, addr, ptep, pte)
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#define huge_ptep_get_and_clear(mm, addr, ptep) ptep_get_and_clear(mm, addr, ptep)
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#else
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void set_huge_pte_at(struct mm_struct *mm, unsigned long addr,
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pte_t *ptep, pte_t pte);
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pte_t huge_ptep_get_and_clear(struct mm_struct *mm, unsigned long addr,
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pte_t *ptep);
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#endif
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#ifndef ARCH_HAS_HUGETLB_PREFAULT_HOOK
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#define hugetlb_prefault_arch_hook(mm) do { } while (0)
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#else
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void hugetlb_prefault_arch_hook(struct mm_struct *mm);
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#endif
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#else /* !CONFIG_HUGETLB_PAGE */
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static inline int is_vm_hugetlb_page(struct vm_area_struct *vma)
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{
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return 0;
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}
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static inline unsigned long hugetlb_total_pages(void)
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{
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return 0;
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}
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#define follow_hugetlb_page(m,v,p,vs,a,b,i) ({ BUG(); 0; })
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#define follow_huge_addr(mm, addr, write) ERR_PTR(-EINVAL)
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#define copy_hugetlb_page_range(src, dst, vma) ({ BUG(); 0; })
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#define hugetlb_prefault(mapping, vma) ({ BUG(); 0; })
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#define zap_hugepage_range(vma, start, len) BUG()
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#define unmap_hugepage_range(vma, start, end) BUG()
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#define is_hugepage_mem_enough(size) 0
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#define hugetlb_report_meminfo(buf) 0
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#define hugetlb_report_node_meminfo(n, buf) 0
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#define follow_huge_pmd(mm, addr, pmd, write) NULL
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#define is_aligned_hugepage_range(addr, len) 0
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#define prepare_hugepage_range(addr, len) (-EINVAL)
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#define pmd_huge(x) 0
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#define is_hugepage_only_range(mm, addr, len) 0
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#define hugetlb_free_pgd_range(tlb, addr, end, floor, ceiling) \
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do { } while (0)
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#define alloc_huge_page() ({ NULL; })
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#define free_huge_page(p) ({ (void)(p); BUG(); })
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#ifndef HPAGE_MASK
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#define HPAGE_MASK 0 /* Keep the compiler happy */
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#define HPAGE_SIZE 0
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#endif
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#endif /* !CONFIG_HUGETLB_PAGE */
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#ifdef CONFIG_HUGETLBFS
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struct hugetlbfs_config {
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uid_t uid;
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gid_t gid;
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umode_t mode;
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long nr_blocks;
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long nr_inodes;
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};
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struct hugetlbfs_sb_info {
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long max_blocks; /* blocks allowed */
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long free_blocks; /* blocks free */
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long max_inodes; /* inodes allowed */
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long free_inodes; /* inodes free */
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spinlock_t stat_lock;
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};
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struct hugetlbfs_inode_info {
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struct shared_policy policy;
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struct inode vfs_inode;
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};
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static inline struct hugetlbfs_inode_info *HUGETLBFS_I(struct inode *inode)
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{
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return container_of(inode, struct hugetlbfs_inode_info, vfs_inode);
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}
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static inline struct hugetlbfs_sb_info *HUGETLBFS_SB(struct super_block *sb)
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{
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return sb->s_fs_info;
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}
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extern struct file_operations hugetlbfs_file_operations;
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extern struct vm_operations_struct hugetlb_vm_ops;
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struct file *hugetlb_zero_setup(size_t);
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int hugetlb_get_quota(struct address_space *mapping);
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void hugetlb_put_quota(struct address_space *mapping);
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static inline int is_file_hugepages(struct file *file)
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{
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return file->f_op == &hugetlbfs_file_operations;
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}
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static inline void set_file_hugepages(struct file *file)
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{
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file->f_op = &hugetlbfs_file_operations;
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}
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#else /* !CONFIG_HUGETLBFS */
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#define is_file_hugepages(file) 0
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#define set_file_hugepages(file) BUG()
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#define hugetlb_zero_setup(size) ERR_PTR(-ENOSYS)
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#endif /* !CONFIG_HUGETLBFS */
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#endif /* _LINUX_HUGETLB_H */
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