5a6fe12595
When overcommit is disabled, the core VM accounts for pages used by anonymous
shared, private mappings and special mappings. It keeps track of VMAs that
should be accounted for with VM_ACCOUNT and VMAs that never had a reserve
with VM_NORESERVE.
Overcommit for hugetlbfs is much riskier than overcommit for base pages
due to contiguity requirements. It avoids overcommiting on both shared and
private mappings using reservation counters that are checked and updated
during mmap(). This ensures (within limits) that hugepages exist in the
future when faults occurs or it is too easy to applications to be SIGKILLed.
As hugetlbfs makes its own reservations of a different unit to the base page
size, VM_ACCOUNT should never be set. Even if the units were correct, we would
double account for the usage in the core VM and hugetlbfs. VM_NORESERVE may
be set because an application can request no reserves be made for hugetlbfs
at the risk of getting killed later.
With commit fc8744adc8, VM_NORESERVE and
VM_ACCOUNT are getting unconditionally set for hugetlbfs-backed mappings. This
breaks the accounting for both the core VM and hugetlbfs, can trigger an
OOM storm when hugepage pools are too small lockups and corrupted counters
otherwise are used. This patch brings hugetlbfs more in line with how the
core VM treats VM_NORESERVE but prevents VM_ACCOUNT being set.
Signed-off-by: Mel Gorman <mel@csn.ul.ie>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
291 lines
8.2 KiB
C
291 lines
8.2 KiB
C
#ifndef _LINUX_HUGETLB_H
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#define _LINUX_HUGETLB_H
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#include <linux/fs.h>
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#ifdef CONFIG_HUGETLB_PAGE
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#include <linux/mempolicy.h>
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#include <linux/shm.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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void reset_vma_resv_huge_pages(struct vm_area_struct *vma);
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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 hugetlb_overcommit_handler(struct ctl_table *, int, struct file *, void __user *, size_t *, loff_t *);
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int hugetlb_treat_movable_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, int);
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void unmap_hugepage_range(struct vm_area_struct *,
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unsigned long, unsigned long, struct page *);
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void __unmap_hugepage_range(struct vm_area_struct *,
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unsigned long, unsigned long, struct page *);
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int hugetlb_prefault(struct address_space *, struct vm_area_struct *);
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void hugetlb_report_meminfo(struct seq_file *);
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int hugetlb_report_node_meminfo(int, char *);
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unsigned long hugetlb_total_pages(void);
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int hugetlb_fault(struct mm_struct *mm, struct vm_area_struct *vma,
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unsigned long address, int write_access);
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int hugetlb_reserve_pages(struct inode *inode, long from, long to,
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struct vm_area_struct *vma,
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int acctflags);
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void hugetlb_unreserve_pages(struct inode *inode, long offset, long freed);
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extern unsigned long hugepages_treat_as_movable;
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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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extern struct list_head huge_boot_pages;
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/* arch callbacks */
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pte_t *huge_pte_alloc(struct mm_struct *mm,
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unsigned long addr, unsigned long sz);
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pte_t *huge_pte_offset(struct mm_struct *mm, unsigned long addr);
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int huge_pmd_unshare(struct mm_struct *mm, unsigned long *addr, pte_t *ptep);
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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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struct page *follow_huge_pud(struct mm_struct *mm, unsigned long address,
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pud_t *pud, int write);
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int pmd_huge(pmd_t pmd);
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int pud_huge(pud_t pmd);
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void hugetlb_change_protection(struct vm_area_struct *vma,
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unsigned long address, unsigned long end, pgprot_t newprot);
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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 void reset_vma_resv_huge_pages(struct vm_area_struct *vma)
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{
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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,w) ({ 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 unmap_hugepage_range(vma, start, end, page) BUG()
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static inline void hugetlb_report_meminfo(struct seq_file *m)
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{
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}
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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 follow_huge_pud(mm, addr, pud, write) NULL
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#define prepare_hugepage_range(file, addr, len) (-EINVAL)
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#define pmd_huge(x) 0
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#define pud_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) ({BUG(); 0; })
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#define hugetlb_fault(mm, vma, addr, write) ({ BUG(); 0; })
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#define hugetlb_change_protection(vma, address, end, newprot)
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#ifndef HPAGE_MASK
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#define HPAGE_MASK PAGE_MASK /* Keep the compiler happy */
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#define HPAGE_SIZE PAGE_SIZE
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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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struct hstate *hstate;
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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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struct hstate *hstate;
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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 const 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_file_setup(const char *name, size_t, int);
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int hugetlb_get_quota(struct address_space *mapping, long delta);
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void hugetlb_put_quota(struct address_space *mapping, long delta);
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static inline int is_file_hugepages(struct file *file)
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{
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if (file->f_op == &hugetlbfs_file_operations)
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return 1;
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if (is_file_shm_hugepages(file))
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return 1;
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return 0;
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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_file_setup(name,size) ERR_PTR(-ENOSYS)
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#endif /* !CONFIG_HUGETLBFS */
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#ifdef HAVE_ARCH_HUGETLB_UNMAPPED_AREA
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unsigned long hugetlb_get_unmapped_area(struct file *file, unsigned long addr,
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unsigned long len, unsigned long pgoff,
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unsigned long flags);
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#endif /* HAVE_ARCH_HUGETLB_UNMAPPED_AREA */
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#ifdef CONFIG_HUGETLB_PAGE
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#define HSTATE_NAME_LEN 32
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/* Defines one hugetlb page size */
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struct hstate {
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int hugetlb_next_nid;
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unsigned int order;
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unsigned long mask;
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unsigned long max_huge_pages;
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unsigned long nr_huge_pages;
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unsigned long free_huge_pages;
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unsigned long resv_huge_pages;
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unsigned long surplus_huge_pages;
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unsigned long nr_overcommit_huge_pages;
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struct list_head hugepage_freelists[MAX_NUMNODES];
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unsigned int nr_huge_pages_node[MAX_NUMNODES];
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unsigned int free_huge_pages_node[MAX_NUMNODES];
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unsigned int surplus_huge_pages_node[MAX_NUMNODES];
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char name[HSTATE_NAME_LEN];
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};
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struct huge_bootmem_page {
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struct list_head list;
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struct hstate *hstate;
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};
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/* arch callback */
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int __init alloc_bootmem_huge_page(struct hstate *h);
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void __init hugetlb_add_hstate(unsigned order);
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struct hstate *size_to_hstate(unsigned long size);
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#ifndef HUGE_MAX_HSTATE
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#define HUGE_MAX_HSTATE 1
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#endif
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extern struct hstate hstates[HUGE_MAX_HSTATE];
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extern unsigned int default_hstate_idx;
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#define default_hstate (hstates[default_hstate_idx])
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static inline struct hstate *hstate_inode(struct inode *i)
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{
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struct hugetlbfs_sb_info *hsb;
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hsb = HUGETLBFS_SB(i->i_sb);
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return hsb->hstate;
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}
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static inline struct hstate *hstate_file(struct file *f)
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{
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return hstate_inode(f->f_dentry->d_inode);
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}
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static inline struct hstate *hstate_vma(struct vm_area_struct *vma)
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{
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return hstate_file(vma->vm_file);
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}
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static inline unsigned long huge_page_size(struct hstate *h)
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{
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return (unsigned long)PAGE_SIZE << h->order;
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}
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extern unsigned long vma_kernel_pagesize(struct vm_area_struct *vma);
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extern unsigned long vma_mmu_pagesize(struct vm_area_struct *vma);
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static inline unsigned long huge_page_mask(struct hstate *h)
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{
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return h->mask;
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}
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static inline unsigned int huge_page_order(struct hstate *h)
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{
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return h->order;
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}
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static inline unsigned huge_page_shift(struct hstate *h)
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{
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return h->order + PAGE_SHIFT;
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}
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static inline unsigned int pages_per_huge_page(struct hstate *h)
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{
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return 1 << h->order;
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}
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static inline unsigned int blocks_per_huge_page(struct hstate *h)
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{
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return huge_page_size(h) / 512;
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}
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#include <asm/hugetlb.h>
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static inline struct hstate *page_hstate(struct page *page)
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{
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return size_to_hstate(PAGE_SIZE << compound_order(page));
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}
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#else
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struct hstate {};
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#define alloc_bootmem_huge_page(h) NULL
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#define hstate_file(f) NULL
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#define hstate_vma(v) NULL
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#define hstate_inode(i) NULL
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#define huge_page_size(h) PAGE_SIZE
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#define huge_page_mask(h) PAGE_MASK
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#define vma_kernel_pagesize(v) PAGE_SIZE
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#define vma_mmu_pagesize(v) PAGE_SIZE
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#define huge_page_order(h) 0
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#define huge_page_shift(h) PAGE_SHIFT
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static inline unsigned int pages_per_huge_page(struct hstate *h)
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{
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return 1;
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}
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#endif
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#endif /* _LINUX_HUGETLB_H */
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