diff options
Diffstat (limited to 'fs/proc/task_mmu.c')
| -rw-r--r-- | fs/proc/task_mmu.c | 2043 |
1 files changed, 2043 insertions, 0 deletions
diff --git a/fs/proc/task_mmu.c b/fs/proc/task_mmu.c new file mode 100644 index 000000000000..c3faa39c0ce1 --- /dev/null +++ b/fs/proc/task_mmu.c @@ -0,0 +1,2043 @@ +#include <linux/mm.h> +#include <linux/vmacache.h> +#include <linux/hugetlb.h> +#include <linux/huge_mm.h> +#include <linux/mount.h> +#include <linux/seq_file.h> +#include <linux/highmem.h> +#include <linux/ptrace.h> +#include <linux/slab.h> +#include <linux/pagemap.h> +#include <linux/mempolicy.h> +#include <linux/rmap.h> +#include <linux/swap.h> +#include <linux/swapops.h> +#include <linux/mmu_notifier.h> +#include <linux/page_idle.h> +#include <linux/mm_inline.h> +#include <linux/ctype.h> + +#include <asm/elf.h> +#include <asm/uaccess.h> +#include <asm/tlbflush.h> +#include "internal.h" + +void task_mem(struct seq_file *m, struct mm_struct *mm) +{ + unsigned long data, text, lib, swap, ptes, pmds; + unsigned long hiwater_vm, total_vm, hiwater_rss, total_rss; + + /* + * Note: to minimize their overhead, mm maintains hiwater_vm and + * hiwater_rss only when about to *lower* total_vm or rss. Any + * collector of these hiwater stats must therefore get total_vm + * and rss too, which will usually be the higher. Barriers? not + * worth the effort, such snapshots can always be inconsistent. + */ + hiwater_vm = total_vm = mm->total_vm; + if (hiwater_vm < mm->hiwater_vm) + hiwater_vm = mm->hiwater_vm; + hiwater_rss = total_rss = get_mm_rss(mm); + if (hiwater_rss < mm->hiwater_rss) + hiwater_rss = mm->hiwater_rss; + + data = mm->total_vm - mm->shared_vm - mm->stack_vm; + text = (PAGE_ALIGN(mm->end_code) - (mm->start_code & PAGE_MASK)) >> 10; + lib = (mm->exec_vm << (PAGE_SHIFT-10)) - text; + swap = get_mm_counter(mm, MM_SWAPENTS); + ptes = PTRS_PER_PTE * sizeof(pte_t) * atomic_long_read(&mm->nr_ptes); + pmds = PTRS_PER_PMD * sizeof(pmd_t) * mm_nr_pmds(mm); + seq_printf(m, + "VmPeak:\t%8lu kB\n" + "VmSize:\t%8lu kB\n" + "VmLck:\t%8lu kB\n" + "VmPin:\t%8lu kB\n" + "VmHWM:\t%8lu kB\n" + "VmRSS:\t%8lu kB\n" + "VmData:\t%8lu kB\n" + "VmStk:\t%8lu kB\n" + "VmExe:\t%8lu kB\n" + "VmLib:\t%8lu kB\n" + "VmPTE:\t%8lu kB\n" + "VmPMD:\t%8lu kB\n" + "VmSwap:\t%8lu kB\n", + hiwater_vm << (PAGE_SHIFT-10), + total_vm << (PAGE_SHIFT-10), + mm->locked_vm << (PAGE_SHIFT-10), + mm->pinned_vm << (PAGE_SHIFT-10), + hiwater_rss << (PAGE_SHIFT-10), + total_rss << (PAGE_SHIFT-10), + data << (PAGE_SHIFT-10), + mm->stack_vm << (PAGE_SHIFT-10), text, lib, + ptes >> 10, + pmds >> 10, + swap << (PAGE_SHIFT-10)); + hugetlb_report_usage(m, mm); +} + +unsigned long task_vsize(struct mm_struct *mm) +{ + return PAGE_SIZE * mm->total_vm; +} + +unsigned long task_statm(struct mm_struct *mm, + unsigned long *shared, unsigned long *text, + unsigned long *data, unsigned long *resident) +{ + *shared = get_mm_counter(mm, MM_FILEPAGES); + *text = (PAGE_ALIGN(mm->end_code) - (mm->start_code & PAGE_MASK)) + >> PAGE_SHIFT; + *data = mm->total_vm - mm->shared_vm; + *resident = *shared + get_mm_counter(mm, MM_ANONPAGES); + return mm->total_vm; +} + +#ifdef CONFIG_NUMA +/* + * Save get_task_policy() for show_numa_map(). + */ +static void hold_task_mempolicy(struct proc_maps_private *priv) +{ + struct task_struct *task = priv->task; + + task_lock(task); + priv->task_mempolicy = get_task_policy(task); + mpol_get(priv->task_mempolicy); + task_unlock(task); +} +static void release_task_mempolicy(struct proc_maps_private *priv) +{ + mpol_put(priv->task_mempolicy); +} +#else +static void hold_task_mempolicy(struct proc_maps_private *priv) +{ +} +static void release_task_mempolicy(struct proc_maps_private *priv) +{ +} +#endif + +static void seq_print_vma_name(struct seq_file *m, struct vm_area_struct *vma) +{ + const char __user *name = vma_get_anon_name(vma); + struct mm_struct *mm = vma->vm_mm; + + unsigned long page_start_vaddr; + unsigned long page_offset; + unsigned long num_pages; + unsigned long max_len = NAME_MAX; + int i; + + page_start_vaddr = (unsigned long)name & PAGE_MASK; + page_offset = (unsigned long)name - page_start_vaddr; + num_pages = DIV_ROUND_UP(page_offset + max_len, PAGE_SIZE); + + seq_puts(m, "[anon:"); + + for (i = 0; i < num_pages; i++) { + int len; + int write_len; + const char *kaddr; + long pages_pinned; + struct page *page; + + pages_pinned = get_user_pages(current, mm, page_start_vaddr, + 1, 0, &page, NULL); + if (pages_pinned < 1) { + seq_puts(m, "<fault>]"); + return; + } + + kaddr = (const char *)kmap(page); + len = min(max_len, PAGE_SIZE - page_offset); + write_len = strnlen(kaddr + page_offset, len); + seq_write(m, kaddr + page_offset, write_len); + kunmap(page); + put_page(page); + + /* if strnlen hit a null terminator then we're done */ + if (write_len != len) + break; + + max_len -= len; + page_offset = 0; + page_start_vaddr += PAGE_SIZE; + } + + seq_putc(m, ']'); +} + +static void vma_stop(struct proc_maps_private *priv) +{ + struct mm_struct *mm = priv->mm; + + release_task_mempolicy(priv); + up_read(&mm->mmap_sem); + mmput(mm); +} + +static struct vm_area_struct * +m_next_vma(struct proc_maps_private *priv, struct vm_area_struct *vma) +{ + if (vma == priv->tail_vma) + return NULL; + return vma->vm_next ?: priv->tail_vma; +} + +static void m_cache_vma(struct seq_file *m, struct vm_area_struct *vma) +{ + if (m->count < m->size) /* vma is copied successfully */ + m->version = m_next_vma(m->private, vma) ? vma->vm_start : -1UL; +} + +static void *m_start(struct seq_file *m, loff_t *ppos) +{ + struct proc_maps_private *priv = m->private; + unsigned long last_addr = m->version; + struct mm_struct *mm; + struct vm_area_struct *vma; + unsigned int pos = *ppos; + + /* See m_cache_vma(). Zero at the start or after lseek. */ + if (last_addr == -1UL) + return NULL; + + priv->task = get_proc_task(priv->inode); + if (!priv->task) + return ERR_PTR(-ESRCH); + + mm = priv->mm; + if (!mm || !atomic_inc_not_zero(&mm->mm_users)) + return NULL; + + down_read(&mm->mmap_sem); + hold_task_mempolicy(priv); + priv->tail_vma = get_gate_vma(mm); + + if (last_addr) { + vma = find_vma(mm, last_addr); + if (vma && (vma = m_next_vma(priv, vma))) + return vma; + } + + m->version = 0; + if (pos < mm->map_count) { + for (vma = mm->mmap; pos; pos--) { + m->version = vma->vm_start; + vma = vma->vm_next; + } + return vma; + } + + /* we do not bother to update m->version in this case */ + if (pos == mm->map_count && priv->tail_vma) + return priv->tail_vma; + + vma_stop(priv); + return NULL; +} + +static void *m_next(struct seq_file *m, void *v, loff_t *pos) +{ + struct proc_maps_private *priv = m->private; + struct vm_area_struct *next; + + (*pos)++; + next = m_next_vma(priv, v); + if (!next) + vma_stop(priv); + return next; +} + +static void m_stop(struct seq_file *m, void *v) +{ + struct proc_maps_private *priv = m->private; + + if (!IS_ERR_OR_NULL(v)) + vma_stop(priv); + if (priv->task) { + put_task_struct(priv->task); + priv->task = NULL; + } +} + +static int proc_maps_open(struct inode *inode, struct file *file, + const struct seq_operations *ops, int psize) +{ + struct proc_maps_private *priv = __seq_open_private(file, ops, psize); + + if (!priv) + return -ENOMEM; + + priv->inode = inode; + priv->mm = proc_mem_open(inode, PTRACE_MODE_READ); + if (IS_ERR(priv->mm)) { + int err = PTR_ERR(priv->mm); + + seq_release_private(inode, file); + return err; + } + + return 0; +} + +static int proc_map_release(struct inode *inode, struct file *file) +{ + struct seq_file *seq = file->private_data; + struct proc_maps_private *priv = seq->private; + + if (priv->mm) + mmdrop(priv->mm); + + kfree(priv->rollup); + return seq_release_private(inode, file); +} + +static int do_maps_open(struct inode *inode, struct file *file, + const struct seq_operations *ops) +{ + return proc_maps_open(inode, file, ops, + sizeof(struct proc_maps_private)); +} + +/* + * Indicate if the VMA is a stack for the given task; for + * /proc/PID/maps that is the stack of the main task. + */ +static int is_stack(struct proc_maps_private *priv, + struct vm_area_struct *vma) +{ + /* + * We make no effort to guess what a given thread considers to be + * its "stack". It's not even well-defined for programs written + * languages like Go. + */ + return vma->vm_start <= vma->vm_mm->start_stack && + vma->vm_end >= vma->vm_mm->start_stack; +} + +static void show_vma_header_prefix(struct seq_file *m, + unsigned long start, unsigned long end, + vm_flags_t flags, unsigned long long pgoff, + dev_t dev, unsigned long ino) +{ + seq_setwidth(m, 25 + sizeof(void *) * 6 - 1); + seq_printf(m, "%08lx-%08lx %c%c%c%c %08llx %02x:%02x %lu ", + start, + end, + flags & VM_READ ? 'r' : '-', + flags & VM_WRITE ? 'w' : '-', + flags & VM_EXEC ? 'x' : '-', + flags & VM_MAYSHARE ? 's' : 'p', + pgoff, + MAJOR(dev), MINOR(dev), ino); +} + +static void +show_map_vma(struct seq_file *m, struct vm_area_struct *vma, int is_pid) +{ + struct mm_struct *mm = vma->vm_mm; + struct file *file = vma->vm_file; + struct proc_maps_private *priv = m->private; + vm_flags_t flags = vma->vm_flags; + unsigned long ino = 0; + unsigned long long pgoff = 0; + unsigned long start, end; + dev_t dev = 0; + const char *name = NULL; + + if (file) { + struct inode *inode = file_inode(vma->vm_file); + dev = inode->i_sb->s_dev; + ino = inode->i_ino; + pgoff = ((loff_t)vma->vm_pgoff) << PAGE_SHIFT; + } + + /* We don't show the stack guard page in /proc/maps */ + start = vma->vm_start; + end = vma->vm_end; + show_vma_header_prefix(m, start, end, flags, pgoff, dev, ino); + + /* + * Print the dentry name for named mappings, and a + * special [heap] marker for the heap: + */ + if (file) { + seq_pad(m, ' '); + seq_file_path(m, file, "\n"); + goto done; + } + + if (vma->vm_ops && vma->vm_ops->name) { + name = vma->vm_ops->name(vma); + if (name) + goto done; + } + + name = arch_vma_name(vma); + if (!name) { + if (!mm) { + name = "[vdso]"; + goto done; + } + + if (vma->vm_start <= mm->brk && + vma->vm_end >= mm->start_brk) { + name = "[heap]"; + goto done; + } + + if (is_stack(priv, vma)) { + name = "[stack]"; + goto done; + } + if (vma_get_anon_name(vma)) { + seq_pad(m, ' '); + seq_print_vma_name(m, vma); + } + } + +done: + if (name) { + seq_pad(m, ' '); + seq_puts(m, name); + } + seq_putc(m, '\n'); +} + +static int show_map(struct seq_file *m, void *v, int is_pid) +{ + show_map_vma(m, v, is_pid); + m_cache_vma(m, v); + return 0; +} + +static int show_pid_map(struct seq_file *m, void *v) +{ + return show_map(m, v, 1); +} + +static int show_tid_map(struct seq_file *m, void *v) +{ + return show_map(m, v, 0); +} + +static const struct seq_operations proc_pid_maps_op = { + .start = m_start, + .next = m_next, + .stop = m_stop, + .show = show_pid_map +}; + +static const struct seq_operations proc_tid_maps_op = { + .start = m_start, + .next = m_next, + .stop = m_stop, + .show = show_tid_map +}; + +static int pid_maps_open(struct inode *inode, struct file *file) +{ + return do_maps_open(inode, file, &proc_pid_maps_op); +} + +static int tid_maps_open(struct inode *inode, struct file *file) +{ + return do_maps_open(inode, file, &proc_tid_maps_op); +} + +const struct file_operations proc_pid_maps_operations = { + .open = pid_maps_open, + .read = seq_read, + .llseek = seq_lseek, + .release = proc_map_release, +}; + +const struct file_operations proc_tid_maps_operations = { + .open = tid_maps_open, + .read = seq_read, + .llseek = seq_lseek, + .release = proc_map_release, +}; + +/* + * Proportional Set Size(PSS): my share of RSS. + * + * PSS of a process is the count of pages it has in memory, where each + * page is divided by the number of processes sharing it. So if a + * process has 1000 pages all to itself, and 1000 shared with one other + * process, its PSS will be 1500. + * + * To keep (accumulated) division errors low, we adopt a 64bit + * fixed-point pss counter to minimize division errors. So (pss >> + * PSS_SHIFT) would be the real byte count. + * + * A shift of 12 before division means (assuming 4K page size): + * - 1M 3-user-pages add up to 8KB errors; + * - supports mapcount up to 2^24, or 16M; + * - supports PSS up to 2^52 bytes, or 4PB. + */ +#define PSS_SHIFT 12 + +#ifdef CONFIG_PROC_PAGE_MONITOR +struct mem_size_stats { + bool first; + unsigned long resident; + unsigned long shared_clean; + unsigned long shared_dirty; + unsigned long private_clean; + unsigned long private_dirty; + unsigned long referenced; + unsigned long anonymous; + unsigned long anonymous_thp; + unsigned long swap; + unsigned long shared_hugetlb; + unsigned long private_hugetlb; + unsigned long first_vma_start; + u64 pss; + u64 pss_locked; + u64 swap_pss; +}; + +static void smaps_account(struct mem_size_stats *mss, struct page *page, + unsigned long size, bool young, bool dirty) +{ + int mapcount; + + if (PageAnon(page)) + mss->anonymous += size; + + mss->resident += size; + /* Accumulate the size in pages that have been accessed. */ + if (young || page_is_young(page) || PageReferenced(page)) + mss->referenced += size; + mapcount = page_mapcount(page); + if (mapcount >= 2) { + u64 pss_delta; + + if (dirty || PageDirty(page)) + mss->shared_dirty += size; + else + mss->shared_clean += size; + pss_delta = (u64)size << PSS_SHIFT; + do_div(pss_delta, mapcount); + mss->pss += pss_delta; + } else { + if (dirty || PageDirty(page)) + mss->private_dirty += size; + else + mss->private_clean += size; + mss->pss += (u64)size << PSS_SHIFT; + } +} + +static void smaps_pte_entry(pte_t *pte, unsigned long addr, + struct mm_walk *walk) +{ + struct mem_size_stats *mss = walk->private; + struct vm_area_struct *vma = walk->vma; + struct page *page = NULL; + + if (pte_present(*pte)) { + page = vm_normal_page(vma, addr, *pte); + } else if (is_swap_pte(*pte)) { + swp_entry_t swpent = pte_to_swp_entry(*pte); + + if (!non_swap_entry(swpent)) { + int mapcount; + + mss->swap += PAGE_SIZE; + mapcount = swp_swapcount(swpent); + if (mapcount >= 2) { + u64 pss_delta = (u64)PAGE_SIZE << PSS_SHIFT; + + do_div(pss_delta, mapcount); + mss->swap_pss += pss_delta; + } else { + mss->swap_pss += (u64)PAGE_SIZE << PSS_SHIFT; + } + } else if (is_migration_entry(swpent)) + page = migration_entry_to_page(swpent); + } + + if (!page) + return; + smaps_account(mss, page, PAGE_SIZE, pte_young(*pte), pte_dirty(*pte)); +} + +#ifdef CONFIG_TRANSPARENT_HUGEPAGE +static void smaps_pmd_entry(pmd_t *pmd, unsigned long addr, + struct mm_walk *walk) +{ + struct mem_size_stats *mss = walk->private; + struct vm_area_struct *vma = walk->vma; + struct page *page; + + /* FOLL_DUMP will return -EFAULT on huge zero page */ + page = follow_trans_huge_pmd(vma, addr, pmd, FOLL_DUMP); + if (IS_ERR_OR_NULL(page)) + return; + mss->anonymous_thp += HPAGE_PMD_SIZE; + smaps_account(mss, page, HPAGE_PMD_SIZE, + pmd_young(*pmd), pmd_dirty(*pmd)); +} +#else +static void smaps_pmd_entry(pmd_t *pmd, unsigned long addr, + struct mm_walk *walk) +{ +} +#endif + +static int smaps_pte_range(pmd_t *pmd, unsigned long addr, unsigned long end, + struct mm_walk *walk) +{ + struct vm_area_struct *vma = walk->vma; + pte_t *pte; + spinlock_t *ptl; + + if (pmd_trans_huge_lock(pmd, vma, &ptl) == 1) { + smaps_pmd_entry(pmd, addr, walk); + spin_unlock(ptl); + return 0; + } + + if (pmd_trans_unstable(pmd)) + return 0; + /* + * The mmap_sem held all the way back in m_start() is what + * keeps khugepaged out of here and from collapsing things + * in here. + */ + pte = pte_offset_map_lock(vma->vm_mm, pmd, addr, &ptl); + for (; addr != end; pte++, addr += PAGE_SIZE) + smaps_pte_entry(pte, addr, walk); + pte_unmap_unlock(pte - 1, ptl); + cond_resched(); + return 0; +} + +static void show_smap_vma_flags(struct seq_file *m, struct vm_area_struct *vma) +{ + /* + * Don't forget to update Documentation/ on changes. + */ + static const char mnemonics[BITS_PER_LONG][2] = { + /* + * In case if we meet a flag we don't know about. + */ + [0 ... (BITS_PER_LONG-1)] = "??", + + [ilog2(VM_READ)] = "rd", + [ilog2(VM_WRITE)] = "wr", + [ilog2(VM_EXEC)] = "ex", + [ilog2(VM_SHARED)] = "sh", + [ilog2(VM_MAYREAD)] = "mr", + [ilog2(VM_MAYWRITE)] = "mw", + [ilog2(VM_MAYEXEC)] = "me", + [ilog2(VM_MAYSHARE)] = "ms", + [ilog2(VM_GROWSDOWN)] = "gd", + [ilog2(VM_PFNMAP)] = "pf", + [ilog2(VM_DENYWRITE)] = "dw", +#ifdef CONFIG_X86_INTEL_MPX + [ilog2(VM_MPX)] = "mp", +#endif + [ilog2(VM_LOCKED)] = "lo", + [ilog2(VM_IO)] = "io", + [ilog2(VM_SEQ_READ)] = "sr", + [ilog2(VM_RAND_READ)] = "rr", + [ilog2(VM_DONTCOPY)] = "dc", + [ilog2(VM_DONTEXPAND)] = "de", + [ilog2(VM_ACCOUNT)] = "ac", + [ilog2(VM_NORESERVE)] = "nr", + [ilog2(VM_HUGETLB)] = "ht", + [ilog2(VM_ARCH_1)] = "ar", + [ilog2(VM_DONTDUMP)] = "dd", +#ifdef CONFIG_MEM_SOFT_DIRTY + [ilog2(VM_SOFTDIRTY)] = "sd", +#endif + [ilog2(VM_MIXEDMAP)] = "mm", + [ilog2(VM_HUGEPAGE)] = "hg", + [ilog2(VM_NOHUGEPAGE)] = "nh", + [ilog2(VM_MERGEABLE)] = "mg", + [ilog2(VM_UFFD_MISSING)]= "um", + [ilog2(VM_UFFD_WP)] = "uw", + }; + size_t i; + + seq_puts(m, "VmFlags: "); + for (i = 0; i < BITS_PER_LONG; i++) { + if (vma->vm_flags & (1UL << i)) { + seq_printf(m, "%c%c ", + mnemonics[i][0], mnemonics[i][1]); + } + } + seq_putc(m, '\n'); +} + +#ifdef CONFIG_HUGETLB_PAGE +static int smaps_hugetlb_range(pte_t *pte, unsigned long hmask, + unsigned long addr, unsigned long end, + struct mm_walk *walk) +{ + struct mem_size_stats *mss = walk->private; + struct vm_area_struct *vma = walk->vma; + struct page *page = NULL; + + if (pte_present(*pte)) { + page = vm_normal_page(vma, addr, *pte); + } else if (is_swap_pte(*pte)) { + swp_entry_t swpent = pte_to_swp_entry(*pte); + + if (is_migration_entry(swpent)) + page = migration_entry_to_page(swpent); + } + if (page) { + int mapcount = page_mapcount(page); + + if (mapcount >= 2) + mss->shared_hugetlb += huge_page_size(hstate_vma(vma)); + else + mss->private_hugetlb += huge_page_size(hstate_vma(vma)); + } + return 0; +} +#endif /* HUGETLB_PAGE */ + +static int show_smap(struct seq_file *m, void *v, int is_pid) +{ + struct proc_maps_private *priv = m->private; + struct vm_area_struct *vma = v; + struct mem_size_stats mss_stack; + struct mem_size_stats *mss; + struct mm_walk smaps_walk = { + .pmd_entry = smaps_pte_range, +#ifdef CONFIG_HUGETLB_PAGE + .hugetlb_entry = smaps_hugetlb_range, +#endif + .mm = vma->vm_mm, + }; + int ret = 0; + bool rollup_mode; + bool last_vma; + + if (priv->rollup) { + rollup_mode = true; + mss = priv->rollup; + if (mss->first) { + mss->first_vma_start = vma->vm_start; + mss->first = false; + } + last_vma = !m_next_vma(priv, vma); + } else { + rollup_mode = false; + memset(&mss_stack, 0, sizeof(mss_stack)); + mss = &mss_stack; + } + + smaps_walk.private = mss; + + /* mmap_sem is held in m_start */ + walk_page_vma(vma, &smaps_walk); + if (vma->vm_flags & VM_LOCKED) + mss->pss_locked += mss->pss; + + if (!rollup_mode) { + show_map_vma(m, vma, is_pid); + } else if (last_vma) { + show_vma_header_prefix( + m, mss->first_vma_start, vma->vm_end, 0, 0, 0, 0); + seq_pad(m, ' '); + seq_puts(m, "[rollup]\n"); + } else { + ret = SEQ_SKIP; + } + + if (!rollup_mode && vma_get_anon_name(vma)) { + seq_puts(m, "Name: "); + seq_print_vma_name(m, vma); + seq_putc(m, '\n'); + } + + if (!rollup_mode) + seq_printf(m, + "Size: %8lu kB\n" + "KernelPageSize: %8lu kB\n" + "MMUPageSize: %8lu kB\n", + (vma->vm_end - vma->vm_start) >> 10, + vma_kernel_pagesize(vma) >> 10, + vma_mmu_pagesize(vma) >> 10); + + + if (!rollup_mode || last_vma) + seq_printf(m, + "Rss: %8lu kB\n" + "Pss: %8lu kB\n" + "Shared_Clean: %8lu kB\n" + "Shared_Dirty: %8lu kB\n" + "Private_Clean: %8lu kB\n" + "Private_Dirty: %8lu kB\n" + "Referenced: %8lu kB\n" + "Anonymous: %8lu kB\n" + "AnonHugePages: %8lu kB\n" + "Shared_Hugetlb: %8lu kB\n" + "Private_Hugetlb: %7lu kB\n" + "Swap: %8lu kB\n" + "SwapPss: %8lu kB\n" + "Locked: %8lu kB\n", + mss->resident >> 10, + (unsigned long)(mss->pss >> (10 + PSS_SHIFT)), + mss->shared_clean >> 10, + mss->shared_dirty >> 10, + mss->private_clean >> 10, + mss->private_dirty >> 10, + mss->referenced >> 10, + mss->anonymous >> 10, + mss->anonymous_thp >> 10, + mss->shared_hugetlb >> 10, + mss->private_hugetlb >> 10, + mss->swap >> 10, + (unsigned long)(mss->swap_pss >> (10 + PSS_SHIFT)), + (unsigned long)(mss->pss >> (10 + PSS_SHIFT))); + + if (!rollup_mode) { + show_smap_vma_flags(m, vma); + } + m_cache_vma(m, vma); + return ret; +} + +static int show_pid_smap(struct seq_file *m, void *v) +{ + return show_smap(m, v, 1); +} + +static int show_tid_smap(struct seq_file *m, void *v) +{ + return show_smap(m, v, 0); +} + +static const struct seq_operations proc_pid_smaps_op = { + .start = m_start, + .next = m_next, + .stop = m_stop, + .show = show_pid_smap +}; + +static const struct seq_operations proc_tid_smaps_op = { + .start = m_start, + .next = m_next, + .stop = m_stop, + .show = show_tid_smap +}; + +static int pid_smaps_open(struct inode *inode, struct file *file) +{ + return do_maps_open(inode, file, &proc_pid_smaps_op); +} + +static int pid_smaps_rollup_open(struct inode *inode, struct file *file) +{ + struct seq_file *seq; + struct proc_maps_private *priv; + int ret = do_maps_open(inode, file, &proc_pid_smaps_op); + + if (ret < 0) + return ret; + seq = file->private_data; + priv = seq->private; + priv->rollup = kzalloc(sizeof(*priv->rollup), GFP_KERNEL); + if (!priv->rollup) { + proc_map_release(inode, file); + return -ENOMEM; + } + priv->rollup->first = true; + return 0; +} + +static int tid_smaps_open(struct inode *inode, struct file *file) +{ + return do_maps_open(inode, file, &proc_tid_smaps_op); +} + +const struct file_operations proc_pid_smaps_operations = { + .open = pid_smaps_open, + .read = seq_read, + .llseek = seq_lseek, + .release = proc_map_release, +}; + +const struct file_operations proc_pid_smaps_rollup_operations = { + .open = pid_smaps_rollup_open, + .read = seq_read, + .llseek = seq_lseek, + .release = proc_map_release, +}; + +const struct file_operations proc_tid_smaps_operations = { + .open = tid_smaps_open, + .read = seq_read, + .llseek = seq_lseek, + .release = proc_map_release, +}; + +enum clear_refs_types { + CLEAR_REFS_ALL = 1, + CLEAR_REFS_ANON, + CLEAR_REFS_MAPPED, + CLEAR_REFS_SOFT_DIRTY, + CLEAR_REFS_MM_HIWATER_RSS, + CLEAR_REFS_LAST, +}; + +struct clear_refs_private { + enum clear_refs_types type; +}; + +#ifdef CONFIG_MEM_SOFT_DIRTY +static inline void clear_soft_dirty(struct vm_area_struct *vma, + unsigned long addr, pte_t *pte) +{ + /* + * The soft-dirty tracker uses #PF-s to catch writes + * to pages, so write-protect the pte as well. See the + * Documentation/vm/soft-dirty.txt for full description + * of how soft-dirty works. + */ + pte_t ptent = *pte; + + if (pte_present(ptent)) { + ptent = ptep_modify_prot_start(vma->vm_mm, addr, pte); + ptent = pte_wrprotect(ptent); + ptent = pte_clear_soft_dirty(ptent); + ptep_modify_prot_commit(vma->vm_mm, addr, pte, ptent); + } else if (is_swap_pte(ptent)) { + ptent = pte_swp_clear_soft_dirty(ptent); + set_pte_at(vma->vm_mm, addr, pte, ptent); + } +} +#else +static inline void clear_soft_dirty(struct vm_area_struct *vma, + unsigned long addr, pte_t *pte) +{ +} +#endif + +#if defined(CONFIG_MEM_SOFT_DIRTY) && defined(CONFIG_TRANSPARENT_HUGEPAGE) +static inline void clear_soft_dirty_pmd(struct vm_area_struct *vma, + unsigned long addr, pmd_t *pmdp) +{ + pmd_t pmd = *pmdp; + + /* See comment in change_huge_pmd() */ + pmdp_invalidate(vma, addr, pmdp); + if (pmd_dirty(*pmdp)) + pmd = pmd_mkdirty(pmd); + if (pmd_young(*pmdp)) + pmd = pmd_mkyoung(pmd); + + pmd = pmd_wrprotect(pmd); + pmd = pmd_clear_soft_dirty(pmd); + + if (vma->vm_flags & VM_SOFTDIRTY) + vma->vm_flags &= ~VM_SOFTDIRTY; + + set_pmd_at(vma->vm_mm, addr, pmdp, pmd); +} +#else +static inline void clear_soft_dirty_pmd(struct vm_area_struct *vma, + unsigned long addr, pmd_t *pmdp) +{ +} +#endif + +static int clear_refs_pte_range(pmd_t *pmd, unsigned long addr, + unsigned long end, struct mm_walk *walk) +{ + struct clear_refs_private *cp = walk->private; + struct vm_area_struct *vma = walk->vma; + pte_t *pte, ptent; + spinlock_t *ptl; + struct page *page; + + if (pmd_trans_huge_lock(pmd, vma, &ptl) == 1) { + if (cp->type == CLEAR_REFS_SOFT_DIRTY) { + clear_soft_dirty_pmd(vma, addr, pmd); + goto out; + } + + page = pmd_page(*pmd); + + /* Clear accessed and referenced bits. */ + pmdp_test_and_clear_young(vma, addr, pmd); + test_and_clear_page_young(page); + ClearPageReferenced(page); +out: + spin_unlock(ptl); + return 0; + } + + if (pmd_trans_unstable(pmd)) + return 0; + + pte = pte_offset_map_lock(vma->vm_mm, pmd, addr, &ptl); + for (; addr != end; pte++, addr += PAGE_SIZE) { + ptent = *pte; + + if (cp->type == CLEAR_REFS_SOFT_DIRTY) { + clear_soft_dirty(vma, addr, pte); + continue; + } + + if (!pte_present(ptent)) + continue; + + page = vm_normal_page(vma, addr, ptent); + if (!page) + continue; + + /* Clear accessed and referenced bits. */ + ptep_test_and_clear_young(vma, addr, pte); + test_and_clear_page_young(page); + ClearPageReferenced(page); + } + pte_unmap_unlock(pte - 1, ptl); + cond_resched(); + return 0; +} + +static int clear_refs_test_walk(unsigned long start, unsigned long end, + struct mm_walk *walk) +{ + struct clear_refs_private *cp = walk->private; + struct vm_area_struct *vma = walk->vma; + + if (vma->vm_flags & VM_PFNMAP) + return 1; + + /* + * Writing 1 to /proc/pid/clear_refs affects all pages. + * Writing 2 to /proc/pid/clear_refs only affects anonymous pages. + * Writing 3 to /proc/pid/clear_refs only affects file mapped pages. + * Writing 4 to /proc/pid/clear_refs affects all pages. + */ + if (cp->type == CLEAR_REFS_ANON && vma->vm_file) + return 1; + if (cp->type == CLEAR_REFS_MAPPED && !vma->vm_file) + return 1; + return 0; +} + +static ssize_t clear_refs_write(struct file *file, const char __user *buf, + size_t count, loff_t *ppos) +{ + struct task_struct *task; + char buffer[PROC_NUMBUF]; + struct mm_struct *mm; + struct vm_area_struct *vma; + enum clear_refs_types type; + int itype; + int rv; + + memset(buffer, 0, sizeof(buffer)); + if (count > sizeof(buffer) - 1) + count = sizeof(buffer) - 1; + if (copy_from_user(buffer, buf, count)) + return -EFAULT; + rv = kstrtoint(strstrip(buffer), 10, &itype); + if (rv < 0) + return rv; + type = (enum clear_refs_types)itype; + if (type < CLEAR_REFS_ALL || type >= CLEAR_REFS_LAST) + return -EINVAL; + + task = get_proc_task(file_inode(file)); + if (!task) + return -ESRCH; + mm = get_task_mm(task); + if (mm) { + struct clear_refs_private cp = { + .type = type, + }; + struct mm_walk clear_refs_walk = { + .pmd_entry = clear_refs_pte_range, + .test_walk = clear_refs_test_walk, + .mm = mm, + .private = &cp, + }; + + if (type == CLEAR_REFS_MM_HIWATER_RSS) { + /* + * Writing 5 to /proc/pid/clear_refs resets the peak + * resident set size to this mm's current rss value. + */ + down_write(&mm->mmap_sem); + reset_mm_hiwater_rss(mm); + up_write(&mm->mmap_sem); + goto out_mm; + } + + down_read(&mm->mmap_sem); + if (type == CLEAR_REFS_SOFT_DIRTY) { + for (vma = mm->mmap; vma; vma = vma->vm_next) { + if (!(vma->vm_flags & VM_SOFTDIRTY)) + continue; + up_read(&mm->mmap_sem); + down_write(&mm->mmap_sem); + /* + * Avoid to modify vma->vm_flags + * without locked ops while the + * coredump reads the vm_flags. + */ + if (!mmget_still_valid(mm)) { + /* + * Silently return "count" + * like if get_task_mm() + * failed. FIXME: should this + * function have returned + * -ESRCH if get_task_mm() + * failed like if + * get_proc_task() fails? + */ + up_write(&mm->mmap_sem); + goto out_mm; + } + for (vma = mm->mmap; vma; vma = vma->vm_next) { + vma->vm_flags &= ~VM_SOFTDIRTY; + vma_set_page_prot(vma); + } + downgrade_write(&mm->mmap_sem); + break; + } + mmu_notifier_invalidate_range_start(mm, 0, -1); + } + walk_page_range(0, ~0UL, &clear_refs_walk); + if (type == CLEAR_REFS_SOFT_DIRTY) + mmu_notifier_invalidate_range_end(mm, 0, -1); + flush_tlb_mm(mm); + up_read(&mm->mmap_sem); +out_mm: + mmput(mm); + } + put_task_struct(task); + + return count; +} + +const struct file_operations proc_clear_refs_operations = { + .write = clear_refs_write, + .llseek = noop_llseek, +}; + +typedef struct { + u64 pme; +} pagemap_entry_t; + +struct pagemapread { + int pos, len; /* units: PM_ENTRY_BYTES, not bytes */ + pagemap_entry_t *buffer; + bool show_pfn; +}; + +#define PAGEMAP_WALK_SIZE (PMD_SIZE) +#define PAGEMAP_WALK_MASK (PMD_MASK) + +#define PM_ENTRY_BYTES sizeof(pagemap_entry_t) +#define PM_PFRAME_BITS 55 +#define PM_PFRAME_MASK GENMASK_ULL(PM_PFRAME_BITS - 1, 0) +#define PM_SOFT_DIRTY BIT_ULL(55) +#define PM_MMAP_EXCLUSIVE BIT_ULL(56) +#define PM_FILE BIT_ULL(61) +#define PM_SWAP BIT_ULL(62) +#define PM_PRESENT BIT_ULL(63) + +#define PM_END_OF_BUFFER 1 + +static inline pagemap_entry_t make_pme(u64 frame, u64 flags) +{ + return (pagemap_entry_t) { .pme = (frame & PM_PFRAME_MASK) | flags }; +} + +static int add_to_pagemap(unsigned long addr, pagemap_entry_t *pme, + struct pagemapread *pm) +{ + pm->buffer[pm->pos++] = *pme; + if (pm->pos >= pm->len) + return PM_END_OF_BUFFER; + return 0; +} + +static int pagemap_pte_hole(unsigned long start, unsigned long end, + struct mm_walk *walk) +{ + struct pagemapread *pm = walk->private; + unsigned long addr = start; + int err = 0; + + while (addr < end) { + struct vm_area_struct *vma = find_vma(walk->mm, addr); + pagemap_entry_t pme = make_pme(0, 0); + /* End of address space hole, which we mark as non-present. */ + unsigned long hole_end; + + if (vma) + hole_end = min(end, vma->vm_start); + else + hole_end = end; + + for (; addr < hole_end; addr += PAGE_SIZE) { + err = add_to_pagemap(addr, &pme, pm); + if (err) + goto out; + } + + if (!vma) + break; + + /* Addresses in the VMA. */ + if (vma->vm_flags & VM_SOFTDIRTY) + pme = make_pme(0, PM_SOFT_DIRTY); + for (; addr < min(end, vma->vm_end); addr += PAGE_SIZE) { + err = add_to_pagemap(addr, &pme, pm); + if (err) + goto out; + } + } +out: + return err; +} + +static pagemap_entry_t pte_to_pagemap_entry(struct pagemapread *pm, + struct vm_area_struct *vma, unsigned long addr, pte_t pte) +{ + u64 frame = 0, flags = 0; + struct page *page = NULL; + + if (pte_present(pte)) { + if (pm->show_pfn) + frame = pte_pfn(pte); + flags |= PM_PRESENT; + page = vm_normal_page(vma, addr, pte); + if (pte_soft_dirty(pte)) + flags |= PM_SOFT_DIRTY; + } else if (is_swap_pte(pte)) { + swp_entry_t entry; + if (pte_swp_soft_dirty(pte)) + flags |= PM_SOFT_DIRTY; + entry = pte_to_swp_entry(pte); + frame = swp_type(entry) | + (swp_offset(entry) << MAX_SWAPFILES_SHIFT); + flags |= PM_SWAP; + if (is_migration_entry(entry)) + page = migration_entry_to_page(entry); + } + + if (page && !PageAnon(page)) + flags |= PM_FILE; + if (page && page_mapcount(page) == 1) + flags |= PM_MMAP_EXCLUSIVE; + if (vma->vm_flags & VM_SOFTDIRTY) + flags |= PM_SOFT_DIRTY; + + return make_pme(frame, flags); +} + +static int pagemap_pmd_range(pmd_t *pmdp, unsigned long addr, unsigned long end, + struct mm_walk *walk) +{ + struct vm_area_struct *vma = walk->vma; + struct pagemapread *pm = walk->private; + spinlock_t *ptl; + pte_t *pte, *orig_pte; + int err = 0; + +#ifdef CONFIG_TRANSPARENT_HUGEPAGE + if (pmd_trans_huge_lock(pmdp, vma, &ptl) == 1) { + u64 flags = 0, frame = 0; + pmd_t pmd = *pmdp; + + if ((vma->vm_flags & VM_SOFTDIRTY) || pmd_soft_dirty(pmd)) + flags |= PM_SOFT_DIRTY; + + /* + * Currently pmd for thp is always present because thp + * can not be swapped-out, migrated, or HWPOISONed + * (split in such cases instead.) + * This if-check is just to prepare for future implementation. + */ + if (pmd_present(pmd)) { + struct page *page = pmd_page(pmd); + + if (page_mapcount(page) == 1) + flags |= PM_MMAP_EXCLUSIVE; + + flags |= PM_PRESENT; + if (pm->show_pfn) + frame = pmd_pfn(pmd) + + ((addr & ~PMD_MASK) >> PAGE_SHIFT); + } + + for (; addr != end; addr += PAGE_SIZE) { + pagemap_entry_t pme = make_pme(frame, flags); + + err = add_to_pagemap(addr, &pme, pm); + if (err) + break; + if (pm->show_pfn && (flags & PM_PRESENT)) + frame++; + } + spin_unlock(ptl); + return err; + } + + if (pmd_trans_unstable(pmdp)) + return 0; +#endif /* CONFIG_TRANSPARENT_HUGEPAGE */ + + /* + * We can assume that @vma always points to a valid one and @end never + * goes beyond vma->vm_end. + */ + orig_pte = pte = pte_offset_map_lock(walk->mm, pmdp, addr, &ptl); + for (; addr < end; pte++, addr += PAGE_SIZE) { + pagemap_entry_t pme; + + pme = pte_to_pagemap_entry(pm, vma, addr, *pte); + err = add_to_pagemap(addr, &pme, pm); + if (err) + break; + } + pte_unmap_unlock(orig_pte, ptl); + + cond_resched(); + + return err; +} + +#ifdef CONFIG_HUGETLB_PAGE +/* This function walks within one hugetlb entry in the single call */ +static int pagemap_hugetlb_range(pte_t *ptep, unsigned long hmask, + unsigned long addr, unsigned long end, + struct mm_walk *walk) +{ + struct pagemapread *pm = walk->private; + struct vm_area_struct *vma = walk->vma; + u64 flags = 0, frame = 0; + int err = 0; + pte_t pte; + + if (vma->vm_flags & VM_SOFTDIRTY) + flags |= PM_SOFT_DIRTY; + + pte = huge_ptep_get(ptep); + if (pte_present(pte)) { + struct page *page = pte_page(pte); + + if (!PageAnon(page)) + flags |= PM_FILE; + + if (page_mapcount(page) == 1) + flags |= PM_MMAP_EXCLUSIVE; + + flags |= PM_PRESENT; + if (pm->show_pfn) + frame = pte_pfn(pte) + + ((addr & ~hmask) >> PAGE_SHIFT); + } + + for (; addr != end; addr += PAGE_SIZE) { + pagemap_entry_t pme = make_pme(frame, flags); + + err = add_to_pagemap(addr, &pme, pm); + if (err) + return err; + if (pm->show_pfn && (flags & PM_PRESENT)) + frame++; + } + + cond_resched(); + + return err; +} +#endif /* HUGETLB_PAGE */ + +/* + * /proc/pid/pagemap - an array mapping virtual pages to pfns + * + * For each page in the address space, this file contains one 64-bit entry + * consisting of the following: + * + * Bits 0-54 page frame number (PFN) if present + * Bits 0-4 swap type if swapped + * Bits 5-54 swap offset if swapped + * Bit 55 pte is soft-dirty (see Documentation/vm/soft-dirty.txt) + * Bit 56 page exclusively mapped + * Bits 57-60 zero + * Bit 61 page is file-page or shared-anon + * Bit 62 page swapped + * Bit 63 page present + * + * If the page is not present but in swap, then the PFN contains an + * encoding of the swap file number and the page's offset into the + * swap. Unmapped pages return a null PFN. This allows determining + * precisely which pages are mapped (or in swap) and comparing mapped + * pages between processes. + * + * Efficient users of this interface will use /proc/pid/maps to + * determine which areas of memory are actually mapped and llseek to + * skip over unmapped regions. + */ +static ssize_t pagemap_read(struct file *file, char __user *buf, + size_t count, loff_t *ppos) +{ + struct mm_struct *mm = file->private_data; + struct pagemapread pm; + struct mm_walk pagemap_walk = {}; + unsigned long src; + unsigned long svpfn; + unsigned long start_vaddr; + unsigned long end_vaddr; + int ret = 0, copied = 0; + + if (!mm || !atomic_inc_not_zero(&mm->mm_users)) + goto out; + + ret = -EINVAL; + /* file position must be aligned */ + if ((*ppos % PM_ENTRY_BYTES) || (count % PM_ENTRY_BYTES)) + goto out_mm; + + ret = 0; + if (!count) + goto out_mm; + + /* do not disclose physical addresses: attack vector */ + pm.show_pfn = file_ns_capable(file, &init_user_ns, CAP_SYS_ADMIN); + + pm.len = (PAGEMAP_WALK_SIZE >> PAGE_SHIFT); + pm.buffer = kmalloc(pm.len * PM_ENTRY_BYTES, GFP_TEMPORARY); + ret = -ENOMEM; + if (!pm.buffer) + goto out_mm; + + pagemap_walk.pmd_entry = pagemap_pmd_range; + pagemap_walk.pte_hole = pagemap_pte_hole; +#ifdef CONFIG_HUGETLB_PAGE + pagemap_walk.hugetlb_entry = pagemap_hugetlb_range; +#endif + pagemap_walk.mm = mm; + pagemap_walk.private = ± + + src = *ppos; + svpfn = src / PM_ENTRY_BYTES; + start_vaddr = svpfn << PAGE_SHIFT; + end_vaddr = mm->task_size; + + /* watch out for wraparound */ + if (svpfn > mm->task_size >> PAGE_SHIFT) + start_vaddr = end_vaddr; + + /* + * The odds are that this will stop walking way + * before end_vaddr, because the length of the + * user buffer is tracked in "pm", and the walk + * will stop when we hit the end of the buffer. + */ + ret = 0; + while (count && (start_vaddr < end_vaddr)) { + int len; + unsigned long end; + + pm.pos = 0; + end = (start_vaddr + PAGEMAP_WALK_SIZE) & PAGEMAP_WALK_MASK; + /* overflow ? */ + if (end < start_vaddr || end > end_vaddr) + end = end_vaddr; + down_read(&mm->mmap_sem); + ret = walk_page_range(start_vaddr, end, &pagemap_walk); + up_read(&mm->mmap_sem); + start_vaddr = end; + + len = min(count, PM_ENTRY_BYTES * pm.pos); + if (copy_to_user(buf, pm.buffer, len)) { + ret = -EFAULT; + goto out_free; + } + copied += len; + buf += len; + count -= len; + } + *ppos += copied; + if (!ret || ret == PM_END_OF_BUFFER) + ret = copied; + +out_free: + kfree(pm.buffer); +out_mm: + mmput(mm); +out: + return ret; +} + +static int pagemap_open(struct inode *inode, struct file *file) +{ + struct mm_struct *mm; + + mm = proc_mem_open(inode, PTRACE_MODE_READ); + if (IS_ERR(mm)) + return PTR_ERR(mm); + file->private_data = mm; + return 0; +} + +static int pagemap_release(struct inode *inode, struct file *file) +{ + struct mm_struct *mm = file->private_data; + + if (mm) + mmdrop(mm); + return 0; +} + +const struct file_operations proc_pagemap_operations = { + .llseek = mem_lseek, /* borrow this */ + .read = pagemap_read, + .open = pagemap_open, + .release = pagemap_release, +}; +#endif /* CONFIG_PROC_PAGE_MONITOR */ + +#ifdef CONFIG_PROCESS_RECLAIM +static int reclaim_pte_range(pmd_t *pmd, unsigned long addr, + unsigned long end, struct mm_walk *walk) +{ + struct reclaim_param *rp = walk->private; + struct vm_area_struct *vma = rp->vma; + pte_t *pte, ptent; + spinlock_t *ptl; + struct page *page; + LIST_HEAD(page_list); + int isolated; + int reclaimed; + + split_huge_page_pmd(vma, addr, pmd); + if (pmd_trans_unstable(pmd) || !rp->nr_to_reclaim) + return 0; +cont: + isolated = 0; + pte = pte_offset_map_lock(vma->vm_mm, pmd, addr, &ptl); + for (; addr != end; pte++, addr += PAGE_SIZE) { + ptent = *pte; + if (!pte_present(ptent)) + continue; + + page = vm_normal_page(vma, addr, ptent); + if (!page) + continue; + + if (isolate_lru_page(page)) + continue; + + list_add(&page->lru, &page_list); + inc_zone_page_state(page, NR_ISOLATED_ANON + + page_is_file_cache(page)); + isolated++; + rp->nr_scanned++; + if ((isolated >= SWAP_CLUSTER_MAX) || !rp->nr_to_reclaim) + break; + } + pte_unmap_unlock(pte - 1, ptl); + reclaimed = reclaim_pages_from_list(&page_list, vma); + rp->nr_reclaimed += reclaimed; + rp->nr_to_reclaim -= reclaimed; + if (rp->nr_to_reclaim < 0) + rp->nr_to_reclaim = 0; + + if (rp->nr_to_reclaim && (addr != end)) + goto cont; + + cond_resched(); + return 0; +} + +enum reclaim_type { + RECLAIM_FILE, + RECLAIM_ANON, + RECLAIM_ALL, + RECLAIM_RANGE, +}; + +struct reclaim_param reclaim_task_anon(struct task_struct *task, + int nr_to_reclaim) +{ + struct mm_struct *mm; + struct vm_area_struct *vma; + struct mm_walk reclaim_walk = {}; + struct reclaim_param rp; + + rp.nr_reclaimed = 0; + rp.nr_scanned = 0; + get_task_struct(task); + mm = get_task_mm(task); + if (!mm) + goto out; + + reclaim_walk.mm = mm; + reclaim_walk.pmd_entry = reclaim_pte_range; + + rp.nr_to_reclaim = nr_to_reclaim; + reclaim_walk.private = &rp; + + down_read(&mm->mmap_sem); + for (vma = mm->mmap; vma; vma = vma->vm_next) { + if (is_vm_hugetlb_page(vma)) + continue; + + if (vma->vm_file) + continue; + + if (vma->vm_flags & VM_LOCKED) + continue; + + if (!rp.nr_to_reclaim) + break; + + rp.vma = vma; + walk_page_range(vma->vm_start, vma->vm_end, + &reclaim_walk); + } + + flush_tlb_mm(mm); + up_read(&mm->mmap_sem); + mmput(mm); +out: + put_task_struct(task); + return rp; +} + +static ssize_t reclaim_write(struct file *file, const char __user *buf, + size_t count, loff_t *ppos) +{ + struct task_struct *task; + char buffer[200]; + struct mm_struct *mm; + struct vm_area_struct *vma; + enum reclaim_type type; + char *type_buf; + struct mm_walk reclaim_walk = {}; + unsigned long start = 0; + unsigned long end = 0; + struct reclaim_param rp; + + memset(buffer, 0, sizeof(buffer)); + if (count > sizeof(buffer) - 1) + count = sizeof(buffer) - 1; + + if (copy_from_user(buffer, buf, count)) + return -EFAULT; + + type_buf = strstrip(buffer); + if (!strcmp(type_buf, "file")) + type = RECLAIM_FILE; + else if (!strcmp(type_buf, "anon")) + type = RECLAIM_ANON; + else if (!strcmp(type_buf, "all")) + type = RECLAIM_ALL; + else if (isdigit(*type_buf)) + type = RECLAIM_RANGE; + else + goto out_err; + + if (type == RECLAIM_RANGE) { + char *token; + unsigned long long len, len_in, tmp; + token = strsep(&type_buf, " "); + if (!token) + goto out_err; + tmp = memparse(token, &token); + if (tmp & ~PAGE_MASK || tmp > ULONG_MAX) + goto out_err; + start = tmp; + + token = strsep(&type_buf, " "); + if (!token) + goto out_err; + len_in = memparse(token, &token); + len = (len_in + ~PAGE_MASK) & PAGE_MASK; + if (len > ULONG_MAX) + goto out_err; + /* + * Check to see whether len was rounded up from small -ve + * to zero. + */ + if (len_in && !len) + goto out_err; + + end = start + len; + if (end < start) + goto out_err; + } + + task = get_proc_task(file->f_path.dentry->d_inode); + if (!task) + return -ESRCH; + + mm = get_task_mm(task); + if (!mm) + goto out; + + reclaim_walk.mm = mm; + reclaim_walk.pmd_entry = reclaim_pte_range; + + rp.nr_to_reclaim = ~0; + rp.nr_reclaimed = 0; + reclaim_walk.private = &rp; + + down_read(&mm->mmap_sem); + if (type == RECLAIM_RANGE) { + vma = find_vma(mm, start); + while (vma) { + if (vma->vm_start > end) + break; + if (is_vm_hugetlb_page(vma)) + continue; + + rp.vma = vma; + walk_page_range(max(vma->vm_start, start), + min(vma->vm_end, end), + &reclaim_walk); + vma = vma->vm_next; + } + } else { + for (vma = mm->mmap; vma; vma = vma->vm_next) { + if (is_vm_hugetlb_page(vma)) + continue; + + if (type == RECLAIM_ANON && vma->vm_file) + continue; + + if (type == RECLAIM_FILE && !vma->vm_file) + continue; + + rp.vma = vma; + walk_page_range(vma->vm_start, vma->vm_end, + &reclaim_walk); + } + } + + flush_tlb_mm(mm); + up_read(&mm->mmap_sem); + mmput(mm); +out: + put_task_struct(task); + return count; + +out_err: + return -EINVAL; +} + +const struct file_operations proc_reclaim_operations = { + .write = reclaim_write, + .llseek = noop_llseek, +}; +#endif + +#ifdef CONFIG_NUMA + +struct numa_maps { + unsigned long pages; + unsigned long anon; + unsigned long active; + unsigned long writeback; + unsigned long mapcount_max; + unsigned long dirty; + unsigned long swapcache; + unsigned long node[MAX_NUMNODES]; +}; + +struct numa_maps_private { + struct proc_maps_private proc_maps; + struct numa_maps md; +}; + +static void gather_stats(struct page *page, struct numa_maps *md, int pte_dirty, + unsigned long nr_pages) +{ + int count = page_mapcount(page); + + md->pages += nr_pages; + if (pte_dirty || PageDirty(page)) + md->dirty += nr_pages; + + if (PageSwapCache(page)) + md->swapcache += nr_pages; + + if (PageActive(page) || PageUnevictable(page)) + md->active += nr_pages; + + if (PageWriteback(page)) + md->writeback += nr_pages; + + if (PageAnon(page)) + md->anon += nr_pages; + + if (count > md->mapcount_max) + md->mapcount_max = count; + + md->node[page_to_nid(page)] += nr_pages; +} + +static struct page *can_gather_numa_stats(pte_t pte, struct vm_area_struct *vma, + unsigned long addr) +{ + struct page *page; + int nid; + + if (!pte_present(pte)) + return NULL; + + page = vm_normal_page(vma, addr, pte); + if (!page) + return NULL; + + if (PageReserved(page)) + return NULL; + + nid = page_to_nid(page); + if (!node_isset(nid, node_states[N_MEMORY])) + return NULL; + + return page; +} + +#ifdef CONFIG_TRANSPARENT_HUGEPAGE +static struct page *can_gather_numa_stats_pmd(pmd_t pmd, + struct vm_area_struct *vma, + unsigned long addr) +{ + struct page *page; + int nid; + + if (!pmd_present(pmd)) + return NULL; + + page = vm_normal_page_pmd(vma, addr, pmd); + if (!page) + return NULL; + + if (PageReserved(page)) + return NULL; + + nid = page_to_nid(page); + if (!node_isset(nid, node_states[N_MEMORY])) + return NULL; + + return page; +} +#endif + +static int gather_pte_stats(pmd_t *pmd, unsigned long addr, + unsigned long end, struct mm_walk *walk) +{ + struct numa_maps *md = walk->private; + struct vm_area_struct *vma = walk->vma; + spinlock_t *ptl; + pte_t *orig_pte; + pte_t *pte; + +#ifdef CONFIG_TRANSPARENT_HUGEPAGE + if (pmd_trans_huge_lock(pmd, vma, &ptl) == 1) { + struct page *page; + + page = can_gather_numa_stats_pmd(*pmd, vma, addr); + if (page) + gather_stats(page, md, pmd_dirty(*pmd), + HPAGE_PMD_SIZE/PAGE_SIZE); + spin_unlock(ptl); + return 0; + } + + if (pmd_trans_unstable(pmd)) + return 0; +#endif + orig_pte = pte = pte_offset_map_lock(walk->mm, pmd, addr, &ptl); + do { + struct page *page = can_gather_numa_stats(*pte, vma, addr); + if (!page) + continue; + gather_stats(page, md, pte_dirty(*pte), 1); + + } while (pte++, addr += PAGE_SIZE, addr != end); + pte_unmap_unlock(orig_pte, ptl); + return 0; +} +#ifdef CONFIG_HUGETLB_PAGE +static int gather_hugetlb_stats(pte_t *pte, unsigned long hmask, + unsigned long addr, unsigned long end, struct mm_walk *walk) +{ + pte_t huge_pte = huge_ptep_get(pte); + struct numa_maps *md; + struct page *page; + + if (!pte_present(huge_pte)) + return 0; + + page = pte_page(huge_pte); + if (!page) + return 0; + + md = walk->private; + gather_stats(page, md, pte_dirty(huge_pte), 1); + return 0; +} + +#else +static int gather_hugetlb_stats(pte_t *pte, unsigned long hmask, + unsigned long addr, unsigned long end, struct mm_walk *walk) +{ + return 0; +} +#endif + +/* + * Display pages allocated per node and memory policy via /proc. + */ +static int show_numa_map(struct seq_file *m, void *v, int is_pid) +{ + struct numa_maps_private *numa_priv = m->private; + struct proc_maps_private *proc_priv = &numa_priv->proc_maps; + struct vm_area_struct *vma = v; + struct numa_maps *md = &numa_priv->md; + struct file *file = vma->vm_file; + struct mm_struct *mm = vma->vm_mm; + struct mm_walk walk = { + .hugetlb_entry = gather_hugetlb_stats, + .pmd_entry = gather_pte_stats, + .private = md, + .mm = mm, + }; + struct mempolicy *pol; + char buffer[64]; + int nid; + + if (!mm) + return 0; + + /* Ensure we start with an empty set of numa_maps statistics. */ + memset(md, 0, sizeof(*md)); + + pol = __get_vma_policy(vma, vma->vm_start); + if (pol) { + mpol_to_str(buffer, sizeof(buffer), pol); + mpol_cond_put(pol); + } else { + mpol_to_str(buffer, sizeof(buffer), proc_priv->task_mempolicy); + } + + seq_printf(m, "%08lx %s", vma->vm_start, buffer); + + if (file) { + seq_puts(m, " file="); + seq_file_path(m, file, "\n\t= "); + } else if (vma->vm_start <= mm->brk && vma->vm_end >= mm->start_brk) { + seq_puts(m, " heap"); + } else if (is_stack(proc_priv, vma)) { + seq_puts(m, " stack"); + } + + if (is_vm_hugetlb_page(vma)) + seq_puts(m, " huge"); + + /* mmap_sem is held by m_start */ + walk_page_vma(vma, &walk); + + if (!md->pages) + goto out; + + if (md->anon) + seq_printf(m, " anon=%lu", md->anon); + + if (md->dirty) + seq_printf(m, " dirty=%lu", md->dirty); + + if (md->pages != md->anon && md->pages != md->dirty) + seq_printf(m, " mapped=%lu", md->pages); + + if (md->mapcount_max > 1) + seq_printf(m, " mapmax=%lu", md->mapcount_max); + + if (md->swapcache) + seq_printf(m, " swapcache=%lu", md->swapcache); + + if (md->active < md->pages && !is_vm_hugetlb_page(vma)) + seq_printf(m, " active=%lu", md->active); + + if (md->writeback) + seq_printf(m, " writeback=%lu", md->writeback); + + for_each_node_state(nid, N_MEMORY) + if (md->node[nid]) + seq_printf(m, " N%d=%lu", nid, md->node[nid]); + + seq_printf(m, " kernelpagesize_kB=%lu", vma_kernel_pagesize(vma) >> 10); +out: + seq_putc(m, '\n'); + m_cache_vma(m, vma); + return 0; +} + +static int show_pid_numa_map(struct seq_file *m, void *v) +{ + return show_numa_map(m, v, 1); +} + +static int show_tid_numa_map(struct seq_file *m, void *v) +{ + return show_numa_map(m, v, 0); +} + +static const struct seq_operations proc_pid_numa_maps_op = { + .start = m_start, + .next = m_next, + .stop = m_stop, + .show = show_pid_numa_map, +}; + +static const struct seq_operations proc_tid_numa_maps_op = { + .start = m_start, + .next = m_next, + .stop = m_stop, + .show = show_tid_numa_map, +}; + +static int numa_maps_open(struct inode *inode, struct file *file, + const struct seq_operations *ops) +{ + return proc_maps_open(inode, file, ops, + sizeof(struct numa_maps_private)); +} + +static int pid_numa_maps_open(struct inode *inode, struct file *file) +{ + return numa_maps_open(inode, file, &proc_pid_numa_maps_op); +} + +static int tid_numa_maps_open(struct inode *inode, struct file *file) +{ + return numa_maps_open(inode, file, &proc_tid_numa_maps_op); +} + +const struct file_operations proc_pid_numa_maps_operations = { + .open = pid_numa_maps_open, + .read = seq_read, + .llseek = seq_lseek, + .release = proc_map_release, +}; + +const struct file_operations proc_tid_numa_maps_operations = { + .open = tid_numa_maps_open, + .read = seq_read, + .llseek = seq_lseek, + .release = proc_map_release, +}; +#endif /* CONFIG_NUMA */ |