mm: rework virtual memory accounting
When inspecting a vague code inside prctl(PR_SET_MM_MEM) call (which testing the RLIMIT_DATA value to figure out if we're allowed to assign new @start_brk, @brk, @start_data, @end_data from mm_struct) it's been commited that RLIMIT_DATA in a form it's implemented now doesn't do anything useful because most of user-space libraries use mmap() syscall for dynamic memory allocations. Linus suggested to convert RLIMIT_DATA rlimit into something suitable for anonymous memory accounting. But in this patch we go further, and the changes are bundled together as: * keep vma counting if CONFIG_PROC_FS=n, will be used for limits * replace mm->shared_vm with better defined mm->data_vm * account anonymous executable areas as executable * account file-backed growsdown/up areas as stack * drop struct file* argument from vm_stat_account * enforce RLIMIT_DATA for size of data areas This way code looks cleaner: now code/stack/data classification depends only on vm_flags state: VM_EXEC & ~VM_WRITE -> code (VmExe + VmLib in proc) VM_GROWSUP | VM_GROWSDOWN -> stack (VmStk) VM_WRITE & ~VM_SHARED & !stack -> data (VmData) The rest (VmSize - VmData - VmStk - VmExe - VmLib) could be called "shared", but that might be strange beast like readonly-private or VM_IO area. - RLIMIT_AS limits whole address space "VmSize" - RLIMIT_STACK limits stack "VmStk" (but each vma individually) - RLIMIT_DATA now limits "VmData" Signed-off-by: Konstantin Khlebnikov <koct9i@gmail.com> Signed-off-by: Cyrill Gorcunov <gorcunov@openvz.org> Cc: Quentin Casasnovas <quentin.casasnovas@oracle.com> Cc: Vegard Nossum <vegard.nossum@oracle.com> Acked-by: Linus Torvalds <torvalds@linux-foundation.org> Cc: Willy Tarreau <w@1wt.eu> Cc: Andy Lutomirski <luto@amacapital.net> Cc: Kees Cook <keescook@google.com> Cc: Vladimir Davydov <vdavydov@virtuozzo.com> Cc: Pavel Emelyanov <xemul@virtuozzo.com> Cc: Peter Zijlstra <a.p.zijlstra@chello.nl> 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
Родитель
d30b5545bd
Коммит
8463833590
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@ -2332,8 +2332,7 @@ pfm_smpl_buffer_alloc(struct task_struct *task, struct file *filp, pfm_context_t
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*/
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insert_vm_struct(mm, vma);
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vm_stat_account(vma->vm_mm, vma->vm_flags, vma->vm_file,
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vma_pages(vma));
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vm_stat_account(vma->vm_mm, vma->vm_flags, vma_pages(vma));
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up_write(&task->mm->mmap_sem);
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/*
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@ -23,7 +23,7 @@
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void task_mem(struct seq_file *m, struct mm_struct *mm)
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{
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unsigned long data, text, lib, swap, ptes, pmds, anon, file, shmem;
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unsigned long text, lib, swap, ptes, pmds, anon, file, shmem;
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unsigned long hiwater_vm, total_vm, hiwater_rss, total_rss;
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anon = get_mm_counter(mm, MM_ANONPAGES);
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@ -44,7 +44,6 @@ void task_mem(struct seq_file *m, struct mm_struct *mm)
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if (hiwater_rss < mm->hiwater_rss)
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hiwater_rss = mm->hiwater_rss;
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data = mm->total_vm - mm->shared_vm - mm->stack_vm;
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text = (PAGE_ALIGN(mm->end_code) - (mm->start_code & PAGE_MASK)) >> 10;
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lib = (mm->exec_vm << (PAGE_SHIFT-10)) - text;
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swap = get_mm_counter(mm, MM_SWAPENTS);
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@ -76,7 +75,7 @@ void task_mem(struct seq_file *m, struct mm_struct *mm)
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anon << (PAGE_SHIFT-10),
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file << (PAGE_SHIFT-10),
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shmem << (PAGE_SHIFT-10),
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data << (PAGE_SHIFT-10),
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mm->data_vm << (PAGE_SHIFT-10),
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mm->stack_vm << (PAGE_SHIFT-10), text, lib,
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ptes >> 10,
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pmds >> 10,
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@ -97,7 +96,7 @@ unsigned long task_statm(struct mm_struct *mm,
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get_mm_counter(mm, MM_SHMEMPAGES);
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*text = (PAGE_ALIGN(mm->end_code) - (mm->start_code & PAGE_MASK))
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>> PAGE_SHIFT;
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*data = mm->total_vm - mm->shared_vm;
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*data = mm->data_vm + mm->stack_vm;
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*resident = *shared + get_mm_counter(mm, MM_ANONPAGES);
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return mm->total_vm;
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}
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@ -1929,7 +1929,9 @@ extern void mm_drop_all_locks(struct mm_struct *mm);
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extern void set_mm_exe_file(struct mm_struct *mm, struct file *new_exe_file);
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extern struct file *get_mm_exe_file(struct mm_struct *mm);
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extern int may_expand_vm(struct mm_struct *mm, unsigned long npages);
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extern bool may_expand_vm(struct mm_struct *, vm_flags_t, unsigned long npages);
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extern void vm_stat_account(struct mm_struct *, vm_flags_t, long npages);
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extern struct vm_area_struct *_install_special_mapping(struct mm_struct *mm,
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unsigned long addr, unsigned long len,
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unsigned long flags,
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@ -2147,15 +2149,6 @@ typedef int (*pte_fn_t)(pte_t *pte, pgtable_t token, unsigned long addr,
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extern int apply_to_page_range(struct mm_struct *mm, unsigned long address,
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unsigned long size, pte_fn_t fn, void *data);
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#ifdef CONFIG_PROC_FS
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void vm_stat_account(struct mm_struct *, unsigned long, struct file *, long);
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#else
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static inline void vm_stat_account(struct mm_struct *mm,
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unsigned long flags, struct file *file, long pages)
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{
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mm->total_vm += pages;
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}
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#endif /* CONFIG_PROC_FS */
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#ifdef CONFIG_DEBUG_PAGEALLOC
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extern bool _debug_pagealloc_enabled;
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@ -427,7 +427,7 @@ struct mm_struct {
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unsigned long total_vm; /* Total pages mapped */
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unsigned long locked_vm; /* Pages that have PG_mlocked set */
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unsigned long pinned_vm; /* Refcount permanently increased */
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unsigned long shared_vm; /* Shared pages (files) */
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unsigned long data_vm; /* VM_WRITE & ~VM_SHARED/GROWSDOWN */
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unsigned long exec_vm; /* VM_EXEC & ~VM_WRITE */
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unsigned long stack_vm; /* VM_GROWSUP/DOWN */
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unsigned long def_flags;
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@ -414,7 +414,7 @@ static int dup_mmap(struct mm_struct *mm, struct mm_struct *oldmm)
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RCU_INIT_POINTER(mm->exe_file, get_mm_exe_file(oldmm));
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mm->total_vm = oldmm->total_vm;
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mm->shared_vm = oldmm->shared_vm;
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mm->data_vm = oldmm->data_vm;
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mm->exec_vm = oldmm->exec_vm;
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mm->stack_vm = oldmm->stack_vm;
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@ -433,8 +433,7 @@ static int dup_mmap(struct mm_struct *mm, struct mm_struct *oldmm)
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struct file *file;
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if (mpnt->vm_flags & VM_DONTCOPY) {
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vm_stat_account(mm, mpnt->vm_flags, mpnt->vm_file,
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-vma_pages(mpnt));
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vm_stat_account(mm, mpnt->vm_flags, -vma_pages(mpnt));
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continue;
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}
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charge = 0;
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@ -175,7 +175,7 @@ void dump_mm(const struct mm_struct *mm)
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"mmap_base %lu mmap_legacy_base %lu highest_vm_end %lu\n"
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"pgd %p mm_users %d mm_count %d nr_ptes %lu nr_pmds %lu map_count %d\n"
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"hiwater_rss %lx hiwater_vm %lx total_vm %lx locked_vm %lx\n"
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"pinned_vm %lx shared_vm %lx exec_vm %lx stack_vm %lx\n"
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"pinned_vm %lx data_vm %lx exec_vm %lx stack_vm %lx\n"
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"start_code %lx end_code %lx start_data %lx end_data %lx\n"
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"start_brk %lx brk %lx start_stack %lx\n"
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"arg_start %lx arg_end %lx env_start %lx env_end %lx\n"
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@ -209,7 +209,7 @@ void dump_mm(const struct mm_struct *mm)
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mm_nr_pmds((struct mm_struct *)mm),
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mm->map_count,
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mm->hiwater_rss, mm->hiwater_vm, mm->total_vm, mm->locked_vm,
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mm->pinned_vm, mm->shared_vm, mm->exec_vm, mm->stack_vm,
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mm->pinned_vm, mm->data_vm, mm->exec_vm, mm->stack_vm,
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mm->start_code, mm->end_code, mm->start_data, mm->end_data,
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mm->start_brk, mm->brk, mm->start_stack,
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mm->arg_start, mm->arg_end, mm->env_start, mm->env_end,
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63
mm/mmap.c
63
mm/mmap.c
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@ -1220,24 +1220,6 @@ none:
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return NULL;
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}
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#ifdef CONFIG_PROC_FS
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void vm_stat_account(struct mm_struct *mm, unsigned long flags,
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struct file *file, long pages)
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{
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const unsigned long stack_flags
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= VM_STACK_FLAGS & (VM_GROWSUP|VM_GROWSDOWN);
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mm->total_vm += pages;
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if (file) {
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mm->shared_vm += pages;
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if ((flags & (VM_EXEC|VM_WRITE)) == VM_EXEC)
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mm->exec_vm += pages;
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} else if (flags & stack_flags)
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mm->stack_vm += pages;
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}
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#endif /* CONFIG_PROC_FS */
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/*
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* If a hint addr is less than mmap_min_addr change hint to be as
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* low as possible but still greater than mmap_min_addr
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@ -1556,7 +1538,7 @@ unsigned long mmap_region(struct file *file, unsigned long addr,
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unsigned long charged = 0;
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/* Check against address space limit. */
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if (!may_expand_vm(mm, len >> PAGE_SHIFT)) {
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if (!may_expand_vm(mm, vm_flags, len >> PAGE_SHIFT)) {
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unsigned long nr_pages;
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/*
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@ -1565,7 +1547,8 @@ unsigned long mmap_region(struct file *file, unsigned long addr,
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*/
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nr_pages = count_vma_pages_range(mm, addr, addr + len);
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if (!may_expand_vm(mm, (len >> PAGE_SHIFT) - nr_pages))
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if (!may_expand_vm(mm, vm_flags,
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(len >> PAGE_SHIFT) - nr_pages))
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return -ENOMEM;
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}
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@ -1664,7 +1647,7 @@ unsigned long mmap_region(struct file *file, unsigned long addr,
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out:
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perf_event_mmap(vma);
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vm_stat_account(mm, vm_flags, file, len >> PAGE_SHIFT);
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vm_stat_account(mm, vm_flags, len >> PAGE_SHIFT);
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if (vm_flags & VM_LOCKED) {
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if (!((vm_flags & VM_SPECIAL) || is_vm_hugetlb_page(vma) ||
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vma == get_gate_vma(current->mm)))
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@ -2111,7 +2094,7 @@ static int acct_stack_growth(struct vm_area_struct *vma, unsigned long size, uns
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unsigned long new_start, actual_size;
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/* address space limit tests */
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if (!may_expand_vm(mm, grow))
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if (!may_expand_vm(mm, vma->vm_flags, grow))
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return -ENOMEM;
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/* Stack limit test */
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@ -2208,8 +2191,7 @@ int expand_upwards(struct vm_area_struct *vma, unsigned long address)
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spin_lock(&mm->page_table_lock);
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if (vma->vm_flags & VM_LOCKED)
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mm->locked_vm += grow;
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vm_stat_account(mm, vma->vm_flags,
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vma->vm_file, grow);
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vm_stat_account(mm, vma->vm_flags, grow);
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anon_vma_interval_tree_pre_update_vma(vma);
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vma->vm_end = address;
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anon_vma_interval_tree_post_update_vma(vma);
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@ -2284,8 +2266,7 @@ int expand_downwards(struct vm_area_struct *vma,
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spin_lock(&mm->page_table_lock);
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if (vma->vm_flags & VM_LOCKED)
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mm->locked_vm += grow;
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vm_stat_account(mm, vma->vm_flags,
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vma->vm_file, grow);
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vm_stat_account(mm, vma->vm_flags, grow);
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anon_vma_interval_tree_pre_update_vma(vma);
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vma->vm_start = address;
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vma->vm_pgoff -= grow;
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@ -2399,7 +2380,7 @@ static void remove_vma_list(struct mm_struct *mm, struct vm_area_struct *vma)
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if (vma->vm_flags & VM_ACCOUNT)
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nr_accounted += nrpages;
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vm_stat_account(mm, vma->vm_flags, vma->vm_file, -nrpages);
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vm_stat_account(mm, vma->vm_flags, -nrpages);
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vma = remove_vma(vma);
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} while (vma);
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vm_unacct_memory(nr_accounted);
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@ -2769,7 +2750,7 @@ static unsigned long do_brk(unsigned long addr, unsigned long len)
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}
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/* Check against address space limits *after* clearing old maps... */
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if (!may_expand_vm(mm, len >> PAGE_SHIFT))
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if (!may_expand_vm(mm, flags, len >> PAGE_SHIFT))
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return -ENOMEM;
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if (mm->map_count > sysctl_max_map_count)
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@ -2804,6 +2785,7 @@ static unsigned long do_brk(unsigned long addr, unsigned long len)
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out:
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perf_event_mmap(vma);
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mm->total_vm += len >> PAGE_SHIFT;
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mm->data_vm += len >> PAGE_SHIFT;
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if (flags & VM_LOCKED)
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mm->locked_vm += (len >> PAGE_SHIFT);
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vma->vm_flags |= VM_SOFTDIRTY;
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@ -2995,9 +2977,28 @@ out:
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* Return true if the calling process may expand its vm space by the passed
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* number of pages
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*/
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int may_expand_vm(struct mm_struct *mm, unsigned long npages)
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bool may_expand_vm(struct mm_struct *mm, vm_flags_t flags, unsigned long npages)
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{
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return mm->total_vm + npages <= rlimit(RLIMIT_AS) >> PAGE_SHIFT;
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if (mm->total_vm + npages > rlimit(RLIMIT_AS) >> PAGE_SHIFT)
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return false;
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if ((flags & (VM_WRITE | VM_SHARED | (VM_STACK_FLAGS &
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(VM_GROWSUP | VM_GROWSDOWN)))) == VM_WRITE)
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return mm->data_vm + npages <= rlimit(RLIMIT_DATA);
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return true;
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}
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void vm_stat_account(struct mm_struct *mm, vm_flags_t flags, long npages)
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{
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mm->total_vm += npages;
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if ((flags & (VM_EXEC | VM_WRITE)) == VM_EXEC)
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mm->exec_vm += npages;
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else if (flags & (VM_STACK_FLAGS & (VM_GROWSUP | VM_GROWSDOWN)))
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mm->stack_vm += npages;
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else if ((flags & (VM_WRITE | VM_SHARED)) == VM_WRITE)
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mm->data_vm += npages;
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}
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static int special_mapping_fault(struct vm_area_struct *vma,
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@ -3079,7 +3080,7 @@ static struct vm_area_struct *__install_special_mapping(
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if (ret)
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goto out;
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mm->total_vm += len >> PAGE_SHIFT;
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vm_stat_account(mm, vma->vm_flags, len >> PAGE_SHIFT);
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perf_event_mmap(vma);
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@ -278,6 +278,10 @@ mprotect_fixup(struct vm_area_struct *vma, struct vm_area_struct **pprev,
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* even if read-only so there is no need to account for them here
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*/
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if (newflags & VM_WRITE) {
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/* Check space limits when area turns into data. */
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if (!may_expand_vm(mm, newflags, nrpages) &&
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may_expand_vm(mm, oldflags, nrpages))
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return -ENOMEM;
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if (!(oldflags & (VM_ACCOUNT|VM_WRITE|VM_HUGETLB|
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VM_SHARED|VM_NORESERVE))) {
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charged = nrpages;
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@ -334,8 +338,8 @@ success:
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populate_vma_page_range(vma, start, end, NULL);
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}
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vm_stat_account(mm, oldflags, vma->vm_file, -nrpages);
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vm_stat_account(mm, newflags, vma->vm_file, nrpages);
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vm_stat_account(mm, oldflags, -nrpages);
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vm_stat_account(mm, newflags, nrpages);
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perf_event_mmap(vma);
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return 0;
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@ -317,7 +317,7 @@ static unsigned long move_vma(struct vm_area_struct *vma,
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* If this were a serious issue, we'd add a flag to do_munmap().
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*/
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hiwater_vm = mm->hiwater_vm;
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vm_stat_account(mm, vma->vm_flags, vma->vm_file, new_len>>PAGE_SHIFT);
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vm_stat_account(mm, vma->vm_flags, new_len >> PAGE_SHIFT);
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/* Tell pfnmap has moved from this vma */
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if (unlikely(vma->vm_flags & VM_PFNMAP))
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@ -383,7 +383,8 @@ static struct vm_area_struct *vma_to_resize(unsigned long addr,
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return ERR_PTR(-EAGAIN);
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}
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if (!may_expand_vm(mm, (new_len - old_len) >> PAGE_SHIFT))
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if (!may_expand_vm(mm, vma->vm_flags,
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(new_len - old_len) >> PAGE_SHIFT))
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return ERR_PTR(-ENOMEM);
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if (vma->vm_flags & VM_ACCOUNT) {
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|
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@ -545,7 +546,7 @@ SYSCALL_DEFINE5(mremap, unsigned long, addr, unsigned long, old_len,
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goto out;
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}
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vm_stat_account(mm, vma->vm_flags, vma->vm_file, pages);
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vm_stat_account(mm, vma->vm_flags, pages);
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if (vma->vm_flags & VM_LOCKED) {
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mm->locked_vm += pages;
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locked = true;
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|
|
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