diff options
author | Linus Torvalds <torvalds@linux-foundation.org> | 2012-03-22 09:04:48 -0700 |
---|---|---|
committer | Linus Torvalds <torvalds@linux-foundation.org> | 2012-03-22 09:04:48 -0700 |
commit | 95211279c5ad00a317c98221d7e4365e02f20836 (patch) | |
tree | 2ddc8625378d2915b8c96392f3cf6663b705ed55 /fs | |
parent | 5375871d432ae9fc581014ac117b96aaee3cd0c7 (diff) | |
parent | 12724850e8064f64b6223d26d78c0597c742c65a (diff) | |
download | op-kernel-dev-95211279c5ad00a317c98221d7e4365e02f20836.zip op-kernel-dev-95211279c5ad00a317c98221d7e4365e02f20836.tar.gz |
Merge branch 'akpm' (Andrew's patch-bomb)
Merge first batch of patches from Andrew Morton:
"A few misc things and all the MM queue"
* emailed from Andrew Morton <akpm@linux-foundation.org>: (92 commits)
memcg: avoid THP split in task migration
thp: add HPAGE_PMD_* definitions for !CONFIG_TRANSPARENT_HUGEPAGE
memcg: clean up existing move charge code
mm/memcontrol.c: remove unnecessary 'break' in mem_cgroup_read()
mm/memcontrol.c: remove redundant BUG_ON() in mem_cgroup_usage_unregister_event()
mm/memcontrol.c: s/stealed/stolen/
memcg: fix performance of mem_cgroup_begin_update_page_stat()
memcg: remove PCG_FILE_MAPPED
memcg: use new logic for page stat accounting
memcg: remove PCG_MOVE_LOCK flag from page_cgroup
memcg: simplify move_account() check
memcg: remove EXPORT_SYMBOL(mem_cgroup_update_page_stat)
memcg: kill dead prev_priority stubs
memcg: remove PCG_CACHE page_cgroup flag
memcg: let css_get_next() rely upon rcu_read_lock()
cgroup: revert ss_id_lock to spinlock
idr: make idr_get_next() good for rcu_read_lock()
memcg: remove unnecessary thp check in page stat accounting
memcg: remove redundant returns
memcg: enum lru_list lru
...
Diffstat (limited to 'fs')
-rw-r--r-- | fs/exec.c | 2 | ||||
-rw-r--r-- | fs/hugetlbfs/inode.c | 138 | ||||
-rw-r--r-- | fs/namei.c | 6 | ||||
-rw-r--r-- | fs/proc/base.c | 12 | ||||
-rw-r--r-- | fs/proc/internal.h | 9 | ||||
-rw-r--r-- | fs/proc/page.c | 2 | ||||
-rw-r--r-- | fs/proc/task_mmu.c | 357 | ||||
-rw-r--r-- | fs/proc/task_nommu.c | 69 | ||||
-rw-r--r-- | fs/seq_file.c | 28 |
9 files changed, 432 insertions, 191 deletions
@@ -822,7 +822,7 @@ static int exec_mmap(struct mm_struct *mm) /* Notify parent that we're no longer interested in the old VM */ tsk = current; old_mm = current->mm; - sync_mm_rss(tsk, old_mm); + sync_mm_rss(old_mm); mm_release(tsk, old_mm); if (old_mm) { diff --git a/fs/hugetlbfs/inode.c b/fs/hugetlbfs/inode.c index 81932fa..ea25174 100644 --- a/fs/hugetlbfs/inode.c +++ b/fs/hugetlbfs/inode.c @@ -41,6 +41,25 @@ const struct file_operations hugetlbfs_file_operations; static const struct inode_operations hugetlbfs_dir_inode_operations; static const struct inode_operations hugetlbfs_inode_operations; +struct hugetlbfs_config { + uid_t uid; + gid_t gid; + umode_t mode; + long nr_blocks; + long nr_inodes; + struct hstate *hstate; +}; + +struct hugetlbfs_inode_info { + struct shared_policy policy; + struct inode vfs_inode; +}; + +static inline struct hugetlbfs_inode_info *HUGETLBFS_I(struct inode *inode) +{ + return container_of(inode, struct hugetlbfs_inode_info, vfs_inode); +} + static struct backing_dev_info hugetlbfs_backing_dev_info = { .name = "hugetlbfs", .ra_pages = 0, /* No readahead */ @@ -154,10 +173,12 @@ hugetlb_get_unmapped_area(struct file *file, unsigned long addr, return addr; } - start_addr = mm->free_area_cache; - - if (len <= mm->cached_hole_size) + if (len > mm->cached_hole_size) + start_addr = mm->free_area_cache; + else { start_addr = TASK_UNMAPPED_BASE; + mm->cached_hole_size = 0; + } full_search: addr = ALIGN(start_addr, huge_page_size(h)); @@ -171,13 +192,18 @@ full_search: */ if (start_addr != TASK_UNMAPPED_BASE) { start_addr = TASK_UNMAPPED_BASE; + mm->cached_hole_size = 0; goto full_search; } return -ENOMEM; } - if (!vma || addr + len <= vma->vm_start) + if (!vma || addr + len <= vma->vm_start) { + mm->free_area_cache = addr + len; return addr; + } + if (addr + mm->cached_hole_size < vma->vm_start) + mm->cached_hole_size = vma->vm_start - addr; addr = ALIGN(vma->vm_end, huge_page_size(h)); } } @@ -238,17 +264,10 @@ static ssize_t hugetlbfs_read(struct file *filp, char __user *buf, loff_t isize; ssize_t retval = 0; - mutex_lock(&inode->i_mutex); - /* validate length */ if (len == 0) goto out; - isize = i_size_read(inode); - if (!isize) - goto out; - - end_index = (isize - 1) >> huge_page_shift(h); for (;;) { struct page *page; unsigned long nr, ret; @@ -256,18 +275,21 @@ static ssize_t hugetlbfs_read(struct file *filp, char __user *buf, /* nr is the maximum number of bytes to copy from this page */ nr = huge_page_size(h); + isize = i_size_read(inode); + if (!isize) + goto out; + end_index = (isize - 1) >> huge_page_shift(h); if (index >= end_index) { if (index > end_index) goto out; nr = ((isize - 1) & ~huge_page_mask(h)) + 1; - if (nr <= offset) { + if (nr <= offset) goto out; - } } nr = nr - offset; /* Find the page */ - page = find_get_page(mapping, index); + page = find_lock_page(mapping, index); if (unlikely(page == NULL)) { /* * We have a HOLE, zero out the user-buffer for the @@ -279,17 +301,18 @@ static ssize_t hugetlbfs_read(struct file *filp, char __user *buf, else ra = 0; } else { + unlock_page(page); + /* * We have the page, copy it to user space buffer. */ ra = hugetlbfs_read_actor(page, offset, buf, len, nr); ret = ra; + page_cache_release(page); } if (ra < 0) { if (retval == 0) retval = ra; - if (page) - page_cache_release(page); goto out; } @@ -299,16 +322,12 @@ static ssize_t hugetlbfs_read(struct file *filp, char __user *buf, index += offset >> huge_page_shift(h); offset &= ~huge_page_mask(h); - if (page) - page_cache_release(page); - /* short read or no more work */ if ((ret != nr) || (len == 0)) break; } out: *ppos = ((loff_t)index << huge_page_shift(h)) + offset; - mutex_unlock(&inode->i_mutex); return retval; } @@ -607,9 +626,15 @@ static int hugetlbfs_statfs(struct dentry *dentry, struct kstatfs *buf) spin_lock(&sbinfo->stat_lock); /* If no limits set, just report 0 for max/free/used * blocks, like simple_statfs() */ - if (sbinfo->max_blocks >= 0) { - buf->f_blocks = sbinfo->max_blocks; - buf->f_bavail = buf->f_bfree = sbinfo->free_blocks; + if (sbinfo->spool) { + long free_pages; + + spin_lock(&sbinfo->spool->lock); + buf->f_blocks = sbinfo->spool->max_hpages; + free_pages = sbinfo->spool->max_hpages + - sbinfo->spool->used_hpages; + buf->f_bavail = buf->f_bfree = free_pages; + spin_unlock(&sbinfo->spool->lock); buf->f_files = sbinfo->max_inodes; buf->f_ffree = sbinfo->free_inodes; } @@ -625,6 +650,10 @@ static void hugetlbfs_put_super(struct super_block *sb) if (sbi) { sb->s_fs_info = NULL; + + if (sbi->spool) + hugepage_put_subpool(sbi->spool); + kfree(sbi); } } @@ -853,10 +882,14 @@ hugetlbfs_fill_super(struct super_block *sb, void *data, int silent) sb->s_fs_info = sbinfo; sbinfo->hstate = config.hstate; spin_lock_init(&sbinfo->stat_lock); - sbinfo->max_blocks = config.nr_blocks; - sbinfo->free_blocks = config.nr_blocks; sbinfo->max_inodes = config.nr_inodes; sbinfo->free_inodes = config.nr_inodes; + sbinfo->spool = NULL; + if (config.nr_blocks != -1) { + sbinfo->spool = hugepage_new_subpool(config.nr_blocks); + if (!sbinfo->spool) + goto out_free; + } sb->s_maxbytes = MAX_LFS_FILESIZE; sb->s_blocksize = huge_page_size(config.hstate); sb->s_blocksize_bits = huge_page_shift(config.hstate); @@ -868,38 +901,12 @@ hugetlbfs_fill_super(struct super_block *sb, void *data, int silent) goto out_free; return 0; out_free: + if (sbinfo->spool) + kfree(sbinfo->spool); kfree(sbinfo); return -ENOMEM; } -int hugetlb_get_quota(struct address_space *mapping, long delta) -{ - int ret = 0; - struct hugetlbfs_sb_info *sbinfo = HUGETLBFS_SB(mapping->host->i_sb); - - if (sbinfo->free_blocks > -1) { - spin_lock(&sbinfo->stat_lock); - if (sbinfo->free_blocks - delta >= 0) - sbinfo->free_blocks -= delta; - else - ret = -ENOMEM; - spin_unlock(&sbinfo->stat_lock); - } - - return ret; -} - -void hugetlb_put_quota(struct address_space *mapping, long delta) -{ - struct hugetlbfs_sb_info *sbinfo = HUGETLBFS_SB(mapping->host->i_sb); - - if (sbinfo->free_blocks > -1) { - spin_lock(&sbinfo->stat_lock); - sbinfo->free_blocks += delta; - spin_unlock(&sbinfo->stat_lock); - } -} - static struct dentry *hugetlbfs_mount(struct file_system_type *fs_type, int flags, const char *dev_name, void *data) { @@ -919,8 +926,8 @@ static int can_do_hugetlb_shm(void) return capable(CAP_IPC_LOCK) || in_group_p(sysctl_hugetlb_shm_group); } -struct file *hugetlb_file_setup(const char *name, size_t size, - vm_flags_t acctflag, +struct file *hugetlb_file_setup(const char *name, unsigned long addr, + size_t size, vm_flags_t acctflag, struct user_struct **user, int creat_flags) { int error = -ENOMEM; @@ -929,6 +936,8 @@ struct file *hugetlb_file_setup(const char *name, size_t size, struct path path; struct dentry *root; struct qstr quick_string; + struct hstate *hstate; + unsigned long num_pages; *user = NULL; if (!hugetlbfs_vfsmount) @@ -937,7 +946,11 @@ struct file *hugetlb_file_setup(const char *name, size_t size, if (creat_flags == HUGETLB_SHMFS_INODE && !can_do_hugetlb_shm()) { *user = current_user(); if (user_shm_lock(size, *user)) { - printk_once(KERN_WARNING "Using mlock ulimits for SHM_HUGETLB is deprecated\n"); + task_lock(current); + printk_once(KERN_WARNING + "%s (%d): Using mlock ulimits for SHM_HUGETLB is deprecated\n", + current->comm, current->pid); + task_unlock(current); } else { *user = NULL; return ERR_PTR(-EPERM); @@ -958,10 +971,12 @@ struct file *hugetlb_file_setup(const char *name, size_t size, if (!inode) goto out_dentry; + hstate = hstate_inode(inode); + size += addr & ~huge_page_mask(hstate); + num_pages = ALIGN(size, huge_page_size(hstate)) >> + huge_page_shift(hstate); error = -ENOMEM; - if (hugetlb_reserve_pages(inode, 0, - size >> huge_page_shift(hstate_inode(inode)), NULL, - acctflag)) + if (hugetlb_reserve_pages(inode, 0, num_pages, NULL, acctflag)) goto out_inode; d_instantiate(path.dentry, inode); @@ -997,6 +1012,7 @@ static int __init init_hugetlbfs_fs(void) if (error) return error; + error = -ENOMEM; hugetlbfs_inode_cachep = kmem_cache_create("hugetlbfs_inode_cache", sizeof(struct hugetlbfs_inode_info), 0, 0, init_once); @@ -1015,10 +1031,10 @@ static int __init init_hugetlbfs_fs(void) } error = PTR_ERR(vfsmount); + unregister_filesystem(&hugetlbfs_fs_type); out: - if (error) - kmem_cache_destroy(hugetlbfs_inode_cachep); + kmem_cache_destroy(hugetlbfs_inode_cachep); out2: bdi_destroy(&hugetlbfs_backing_dev_info); return error; @@ -1455,9 +1455,15 @@ done: } EXPORT_SYMBOL(full_name_hash); +#ifdef CONFIG_64BIT #define ONEBYTES 0x0101010101010101ul #define SLASHBYTES 0x2f2f2f2f2f2f2f2ful #define HIGHBITS 0x8080808080808080ul +#else +#define ONEBYTES 0x01010101ul +#define SLASHBYTES 0x2f2f2f2ful +#define HIGHBITS 0x80808080ul +#endif /* Return the high bit set in the first byte that is a zero */ static inline unsigned long has_zero(unsigned long a) diff --git a/fs/proc/base.c b/fs/proc/base.c index 965d4bd..3b42c14 100644 --- a/fs/proc/base.c +++ b/fs/proc/base.c @@ -2989,9 +2989,9 @@ static const struct pid_entry tgid_base_stuff[] = { INF("cmdline", S_IRUGO, proc_pid_cmdline), ONE("stat", S_IRUGO, proc_tgid_stat), ONE("statm", S_IRUGO, proc_pid_statm), - REG("maps", S_IRUGO, proc_maps_operations), + REG("maps", S_IRUGO, proc_pid_maps_operations), #ifdef CONFIG_NUMA - REG("numa_maps", S_IRUGO, proc_numa_maps_operations), + REG("numa_maps", S_IRUGO, proc_pid_numa_maps_operations), #endif REG("mem", S_IRUSR|S_IWUSR, proc_mem_operations), LNK("cwd", proc_cwd_link), @@ -3002,7 +3002,7 @@ static const struct pid_entry tgid_base_stuff[] = { REG("mountstats", S_IRUSR, proc_mountstats_operations), #ifdef CONFIG_PROC_PAGE_MONITOR REG("clear_refs", S_IWUSR, proc_clear_refs_operations), - REG("smaps", S_IRUGO, proc_smaps_operations), + REG("smaps", S_IRUGO, proc_pid_smaps_operations), REG("pagemap", S_IRUGO, proc_pagemap_operations), #endif #ifdef CONFIG_SECURITY @@ -3348,9 +3348,9 @@ static const struct pid_entry tid_base_stuff[] = { INF("cmdline", S_IRUGO, proc_pid_cmdline), ONE("stat", S_IRUGO, proc_tid_stat), ONE("statm", S_IRUGO, proc_pid_statm), - REG("maps", S_IRUGO, proc_maps_operations), + REG("maps", S_IRUGO, proc_tid_maps_operations), #ifdef CONFIG_NUMA - REG("numa_maps", S_IRUGO, proc_numa_maps_operations), + REG("numa_maps", S_IRUGO, proc_tid_numa_maps_operations), #endif REG("mem", S_IRUSR|S_IWUSR, proc_mem_operations), LNK("cwd", proc_cwd_link), @@ -3360,7 +3360,7 @@ static const struct pid_entry tid_base_stuff[] = { REG("mountinfo", S_IRUGO, proc_mountinfo_operations), #ifdef CONFIG_PROC_PAGE_MONITOR REG("clear_refs", S_IWUSR, proc_clear_refs_operations), - REG("smaps", S_IRUGO, proc_smaps_operations), + REG("smaps", S_IRUGO, proc_tid_smaps_operations), REG("pagemap", S_IRUGO, proc_pagemap_operations), #endif #ifdef CONFIG_SECURITY diff --git a/fs/proc/internal.h b/fs/proc/internal.h index 2925775..c44efe1 100644 --- a/fs/proc/internal.h +++ b/fs/proc/internal.h @@ -53,9 +53,12 @@ extern int proc_pid_statm(struct seq_file *m, struct pid_namespace *ns, struct pid *pid, struct task_struct *task); extern loff_t mem_lseek(struct file *file, loff_t offset, int orig); -extern const struct file_operations proc_maps_operations; -extern const struct file_operations proc_numa_maps_operations; -extern const struct file_operations proc_smaps_operations; +extern const struct file_operations proc_pid_maps_operations; +extern const struct file_operations proc_tid_maps_operations; +extern const struct file_operations proc_pid_numa_maps_operations; +extern const struct file_operations proc_tid_numa_maps_operations; +extern const struct file_operations proc_pid_smaps_operations; +extern const struct file_operations proc_tid_smaps_operations; extern const struct file_operations proc_clear_refs_operations; extern const struct file_operations proc_pagemap_operations; extern const struct file_operations proc_net_operations; diff --git a/fs/proc/page.c b/fs/proc/page.c index 6d8e6a9..7fcd0d6 100644 --- a/fs/proc/page.c +++ b/fs/proc/page.c @@ -115,6 +115,8 @@ u64 stable_page_flags(struct page *page) u |= 1 << KPF_COMPOUND_TAIL; if (PageHuge(page)) u |= 1 << KPF_HUGE; + else if (PageTransCompound(page)) + u |= 1 << KPF_THP; /* * Caveats on high order pages: page->_count will only be set diff --git a/fs/proc/task_mmu.c b/fs/proc/task_mmu.c index 7dcd2a2..9694cc2 100644 --- a/fs/proc/task_mmu.c +++ b/fs/proc/task_mmu.c @@ -209,16 +209,20 @@ static int do_maps_open(struct inode *inode, struct file *file, return ret; } -static void show_map_vma(struct seq_file *m, struct vm_area_struct *vma) +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; + struct task_struct *task = priv->task; vm_flags_t flags = vma->vm_flags; unsigned long ino = 0; unsigned long long pgoff = 0; unsigned long start, end; dev_t dev = 0; int len; + const char *name = NULL; if (file) { struct inode *inode = vma->vm_file->f_path.dentry->d_inode; @@ -252,36 +256,57 @@ static void show_map_vma(struct seq_file *m, struct vm_area_struct *vma) if (file) { pad_len_spaces(m, len); seq_path(m, &file->f_path, "\n"); - } else { - const char *name = arch_vma_name(vma); - if (!name) { - if (mm) { - if (vma->vm_start <= mm->brk && - vma->vm_end >= mm->start_brk) { - name = "[heap]"; - } else if (vma->vm_start <= mm->start_stack && - vma->vm_end >= mm->start_stack) { - name = "[stack]"; - } + goto done; + } + + name = arch_vma_name(vma); + if (!name) { + pid_t tid; + + if (!mm) { + name = "[vdso]"; + goto done; + } + + if (vma->vm_start <= mm->brk && + vma->vm_end >= mm->start_brk) { + name = "[heap]"; + goto done; + } + + tid = vm_is_stack(task, vma, is_pid); + + if (tid != 0) { + /* + * Thread stack in /proc/PID/task/TID/maps or + * the main process stack. + */ + if (!is_pid || (vma->vm_start <= mm->start_stack && + vma->vm_end >= mm->start_stack)) { + name = "[stack]"; } else { - name = "[vdso]"; + /* Thread stack in /proc/PID/maps */ + pad_len_spaces(m, len); + seq_printf(m, "[stack:%d]", tid); } } - if (name) { - pad_len_spaces(m, len); - seq_puts(m, name); - } + } + +done: + if (name) { + pad_len_spaces(m, len); + seq_puts(m, name); } seq_putc(m, '\n'); } -static int show_map(struct seq_file *m, void *v) +static int show_map(struct seq_file *m, void *v, int is_pid) { struct vm_area_struct *vma = v; struct proc_maps_private *priv = m->private; struct task_struct *task = priv->task; - show_map_vma(m, vma); + show_map_vma(m, vma, is_pid); if (m->count < m->size) /* vma is copied successfully */ m->version = (vma != get_gate_vma(task->mm)) @@ -289,20 +314,49 @@ static int show_map(struct seq_file *m, void *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_map + .show = show_pid_map }; -static int maps_open(struct inode *inode, struct file *file) +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); } -const struct file_operations proc_maps_operations = { - .open = maps_open, +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 = seq_release_private, +}; + +const struct file_operations proc_tid_maps_operations = { + .open = tid_maps_open, .read = seq_read, .llseek = seq_lseek, .release = seq_release_private, @@ -394,21 +448,15 @@ static int smaps_pte_range(pmd_t *pmd, unsigned long addr, unsigned long end, pte_t *pte; spinlock_t *ptl; - spin_lock(&walk->mm->page_table_lock); - if (pmd_trans_huge(*pmd)) { - if (pmd_trans_splitting(*pmd)) { - spin_unlock(&walk->mm->page_table_lock); - wait_split_huge_page(vma->anon_vma, pmd); - } else { - smaps_pte_entry(*(pte_t *)pmd, addr, - HPAGE_PMD_SIZE, walk); - spin_unlock(&walk->mm->page_table_lock); - mss->anonymous_thp += HPAGE_PMD_SIZE; - return 0; - } - } else { + if (pmd_trans_huge_lock(pmd, vma) == 1) { + smaps_pte_entry(*(pte_t *)pmd, addr, HPAGE_PMD_SIZE, walk); spin_unlock(&walk->mm->page_table_lock); + mss->anonymous_thp += HPAGE_PMD_SIZE; + 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 @@ -422,7 +470,7 @@ static int smaps_pte_range(pmd_t *pmd, unsigned long addr, unsigned long end, return 0; } -static int show_smap(struct seq_file *m, void *v) +static int show_smap(struct seq_file *m, void *v, int is_pid) { struct proc_maps_private *priv = m->private; struct task_struct *task = priv->task; @@ -440,7 +488,7 @@ static int show_smap(struct seq_file *m, void *v) if (vma->vm_mm && !is_vm_hugetlb_page(vma)) walk_page_range(vma->vm_start, vma->vm_end, &smaps_walk); - show_map_vma(m, vma); + show_map_vma(m, vma, is_pid); seq_printf(m, "Size: %8lu kB\n" @@ -479,20 +527,49 @@ static int show_smap(struct seq_file *m, void *v) return 0; } +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_smap + .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 smaps_open(struct inode *inode, struct file *file) +static int pid_smaps_open(struct inode *inode, struct file *file) { return do_maps_open(inode, file, &proc_pid_smaps_op); } -const struct file_operations proc_smaps_operations = { - .open = smaps_open, +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 = seq_release_private, +}; + +const struct file_operations proc_tid_smaps_operations = { + .open = tid_smaps_open, .read = seq_read, .llseek = seq_lseek, .release = seq_release_private, @@ -507,6 +584,8 @@ static int clear_refs_pte_range(pmd_t *pmd, unsigned long addr, struct page *page; split_huge_page_pmd(walk->mm, pmd); + 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) { @@ -598,11 +677,18 @@ const struct file_operations proc_clear_refs_operations = { .llseek = noop_llseek, }; +typedef struct { + u64 pme; +} pagemap_entry_t; + struct pagemapread { int pos, len; - u64 *buffer; + pagemap_entry_t *buffer; }; +#define PAGEMAP_WALK_SIZE (PMD_SIZE) +#define PAGEMAP_WALK_MASK (PMD_MASK) + #define PM_ENTRY_BYTES sizeof(u64) #define PM_STATUS_BITS 3 #define PM_STATUS_OFFSET (64 - PM_STATUS_BITS) @@ -620,10 +706,15 @@ struct pagemapread { #define PM_NOT_PRESENT PM_PSHIFT(PAGE_SHIFT) #define PM_END_OF_BUFFER 1 -static int add_to_pagemap(unsigned long addr, u64 pfn, +static inline pagemap_entry_t make_pme(u64 val) +{ + return (pagemap_entry_t) { .pme = val }; +} + +static int add_to_pagemap(unsigned long addr, pagemap_entry_t *pme, struct pagemapread *pm) { - pm->buffer[pm->pos++] = pfn; + pm->buffer[pm->pos++] = *pme; if (pm->pos >= pm->len) return PM_END_OF_BUFFER; return 0; @@ -635,8 +726,10 @@ static int pagemap_pte_hole(unsigned long start, unsigned long end, struct pagemapread *pm = walk->private; unsigned long addr; int err = 0; + pagemap_entry_t pme = make_pme(PM_NOT_PRESENT); + for (addr = start; addr < end; addr += PAGE_SIZE) { - err = add_to_pagemap(addr, PM_NOT_PRESENT, pm); + err = add_to_pagemap(addr, &pme, pm); if (err) break; } @@ -649,17 +742,35 @@ static u64 swap_pte_to_pagemap_entry(pte_t pte) return swp_type(e) | (swp_offset(e) << MAX_SWAPFILES_SHIFT); } -static u64 pte_to_pagemap_entry(pte_t pte) +static void pte_to_pagemap_entry(pagemap_entry_t *pme, pte_t pte) { - u64 pme = 0; if (is_swap_pte(pte)) - pme = PM_PFRAME(swap_pte_to_pagemap_entry(pte)) - | PM_PSHIFT(PAGE_SHIFT) | PM_SWAP; + *pme = make_pme(PM_PFRAME(swap_pte_to_pagemap_entry(pte)) + | PM_PSHIFT(PAGE_SHIFT) | PM_SWAP); else if (pte_present(pte)) - pme = PM_PFRAME(pte_pfn(pte)) - | PM_PSHIFT(PAGE_SHIFT) | PM_PRESENT; - return pme; + *pme = make_pme(PM_PFRAME(pte_pfn(pte)) + | PM_PSHIFT(PAGE_SHIFT) | PM_PRESENT); +} + +#ifdef CONFIG_TRANSPARENT_HUGEPAGE +static void thp_pmd_to_pagemap_entry(pagemap_entry_t *pme, + pmd_t pmd, int offset) +{ + /* + * 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)) + *pme = make_pme(PM_PFRAME(pmd_pfn(pmd) + offset) + | PM_PSHIFT(PAGE_SHIFT) | PM_PRESENT); } +#else +static inline void thp_pmd_to_pagemap_entry(pagemap_entry_t *pme, + pmd_t pmd, int offset) +{ +} +#endif static int pagemap_pte_range(pmd_t *pmd, unsigned long addr, unsigned long end, struct mm_walk *walk) @@ -668,13 +779,30 @@ static int pagemap_pte_range(pmd_t *pmd, unsigned long addr, unsigned long end, struct pagemapread *pm = walk->private; pte_t *pte; int err = 0; + pagemap_entry_t pme = make_pme(PM_NOT_PRESENT); - split_huge_page_pmd(walk->mm, pmd); + if (pmd_trans_unstable(pmd)) + return 0; /* find the first VMA at or above 'addr' */ vma = find_vma(walk->mm, addr); + spin_lock(&walk->mm->page_table_lock); + if (pmd_trans_huge_lock(pmd, vma) == 1) { + for (; addr != end; addr += PAGE_SIZE) { + unsigned long offset; + + offset = (addr & ~PAGEMAP_WALK_MASK) >> + PAGE_SHIFT; + thp_pmd_to_pagemap_entry(&pme, *pmd, offset); + err = add_to_pagemap(addr, &pme, pm); + if (err) + break; + } + spin_unlock(&walk->mm->page_table_lock); + return err; + } + for (; addr != end; addr += PAGE_SIZE) { - u64 pfn = PM_NOT_PRESENT; /* check to see if we've left 'vma' behind * and need a new, higher one */ @@ -686,11 +814,11 @@ static int pagemap_pte_range(pmd_t *pmd, unsigned long addr, unsigned long end, if (vma && (vma->vm_start <= addr) && !is_vm_hugetlb_page(vma)) { pte = pte_offset_map(pmd, addr); - pfn = pte_to_pagemap_entry(*pte); + pte_to_pagemap_entry(&pme, *pte); /* unmap before userspace copy */ pte_unmap(pte); } - err = add_to_pagemap(addr, pfn, pm); + err = add_to_pagemap(addr, &pme, pm); if (err) return err; } @@ -701,13 +829,12 @@ static int pagemap_pte_range(pmd_t *pmd, unsigned long addr, unsigned long end, } #ifdef CONFIG_HUGETLB_PAGE -static u64 huge_pte_to_pagemap_entry(pte_t pte, int offset) +static void huge_pte_to_pagemap_entry(pagemap_entry_t *pme, + pte_t pte, int offset) { - u64 pme = 0; if (pte_present(pte)) - pme = PM_PFRAME(pte_pfn(pte) + offset) - | PM_PSHIFT(PAGE_SHIFT) | PM_PRESENT; - return pme; + *pme = make_pme(PM_PFRAME(pte_pfn(pte) + offset) + | PM_PSHIFT(PAGE_SHIFT) | PM_PRESENT); } /* This function walks within one hugetlb entry in the single call */ @@ -717,12 +844,12 @@ static int pagemap_hugetlb_range(pte_t *pte, unsigned long hmask, { struct pagemapread *pm = walk->private; int err = 0; - u64 pfn; + pagemap_entry_t pme = make_pme(PM_NOT_PRESENT); for (; addr != end; addr += PAGE_SIZE) { int offset = (addr & ~hmask) >> PAGE_SHIFT; - pfn = huge_pte_to_pagemap_entry(*pte, offset); - err = add_to_pagemap(addr, pfn, pm); + huge_pte_to_pagemap_entry(&pme, *pte, offset); + err = add_to_pagemap(addr, &pme, pm); if (err) return err; } @@ -757,8 +884,6 @@ static int pagemap_hugetlb_range(pte_t *pte, unsigned long hmask, * determine which areas of memory are actually mapped and llseek to * skip over unmapped regions. */ -#define PAGEMAP_WALK_SIZE (PMD_SIZE) -#define PAGEMAP_WALK_MASK (PMD_MASK) static ssize_t pagemap_read(struct file *file, char __user *buf, size_t count, loff_t *ppos) { @@ -941,26 +1066,21 @@ static int gather_pte_stats(pmd_t *pmd, unsigned long addr, pte_t *pte; md = walk->private; - spin_lock(&walk->mm->page_table_lock); - if (pmd_trans_huge(*pmd)) { - if (pmd_trans_splitting(*pmd)) { - spin_unlock(&walk->mm->page_table_lock); - wait_split_huge_page(md->vma->anon_vma, pmd); - } else { - pte_t huge_pte = *(pte_t *)pmd; - struct page *page; - - page = can_gather_numa_stats(huge_pte, md->vma, addr); - if (page) - gather_stats(page, md, pte_dirty(huge_pte), - HPAGE_PMD_SIZE/PAGE_SIZE); - spin_unlock(&walk->mm->page_table_lock); - return 0; - } - } else { + + if (pmd_trans_huge_lock(pmd, md->vma) == 1) { + pte_t huge_pte = *(pte_t *)pmd; + struct page *page; + + page = can_gather_numa_stats(huge_pte, md->vma, addr); + if (page) + gather_stats(page, md, pte_dirty(huge_pte), + HPAGE_PMD_SIZE/PAGE_SIZE); spin_unlock(&walk->mm->page_table_lock); + return 0; } + if (pmd_trans_unstable(pmd)) + return 0; orig_pte = pte = pte_offset_map_lock(walk->mm, pmd, addr, &ptl); do { struct page *page = can_gather_numa_stats(*pte, md->vma, addr); @@ -1002,7 +1122,7 @@ static int gather_hugetbl_stats(pte_t *pte, unsigned long hmask, /* * Display pages allocated per node and memory policy via /proc. */ -static int show_numa_map(struct seq_file *m, void *v) +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; @@ -1039,9 +1159,19 @@ static int show_numa_map(struct seq_file *m, void *v) seq_path(m, &file->f_path, "\n\t= "); } else if (vma->vm_start <= mm->brk && vma->vm_end >= mm->start_brk) { seq_printf(m, " heap"); - } else if (vma->vm_start <= mm->start_stack && - vma->vm_end >= mm->start_stack) { - seq_printf(m, " stack"); + } else { + pid_t tid = vm_is_stack(proc_priv->task, vma, is_pid); + if (tid != 0) { + /* + * Thread stack in /proc/PID/task/TID/maps or + * the main process stack. + */ + if (!is_pid || (vma->vm_start <= mm->start_stack && + vma->vm_end >= mm->start_stack)) + seq_printf(m, " stack"); + else + seq_printf(m, " stack:%d", tid); + } } if (is_vm_hugetlb_page(vma)) @@ -1084,21 +1214,39 @@ out: 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_numa_map, + .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) +static int numa_maps_open(struct inode *inode, struct file *file, + const struct seq_operations *ops) { struct numa_maps_private *priv; int ret = -ENOMEM; priv = kzalloc(sizeof(*priv), GFP_KERNEL); if (priv) { priv->proc_maps.pid = proc_pid(inode); - ret = seq_open(file, &proc_pid_numa_maps_op); + ret = seq_open(file, ops); if (!ret) { struct seq_file *m = file->private_data; m->private = priv; @@ -1109,8 +1257,25 @@ static int numa_maps_open(struct inode *inode, struct file *file) return ret; } -const struct file_operations proc_numa_maps_operations = { - .open = numa_maps_open, +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 = seq_release_private, +}; + +const struct file_operations proc_tid_numa_maps_operations = { + .open = tid_numa_maps_open, .read = seq_read, .llseek = seq_lseek, .release = seq_release_private, diff --git a/fs/proc/task_nommu.c b/fs/proc/task_nommu.c index 980de54..74fe164 100644 --- a/fs/proc/task_nommu.c +++ b/fs/proc/task_nommu.c @@ -134,9 +134,11 @@ static void pad_len_spaces(struct seq_file *m, int len) /* * display a single VMA to a sequenced file */ -static int nommu_vma_show(struct seq_file *m, struct vm_area_struct *vma) +static int nommu_vma_show(struct seq_file *m, struct vm_area_struct *vma, + int is_pid) { struct mm_struct *mm = vma->vm_mm; + struct proc_maps_private *priv = m->private; unsigned long ino = 0; struct file *file; dev_t dev = 0; @@ -168,10 +170,19 @@ static int nommu_vma_show(struct seq_file *m, struct vm_area_struct *vma) pad_len_spaces(m, len); seq_path(m, &file->f_path, ""); } else if (mm) { - if (vma->vm_start <= mm->start_stack && - vma->vm_end >= mm->start_stack) { + pid_t tid = vm_is_stack(priv->task, vma, is_pid); + + if (tid != 0) { pad_len_spaces(m, len); - seq_puts(m, "[stack]"); + /* + * Thread stack in /proc/PID/task/TID/maps or + * the main process stack. + */ + if (!is_pid || (vma->vm_start <= mm->start_stack && + vma->vm_end >= mm->start_stack)) + seq_printf(m, "[stack]"); + else + seq_printf(m, "[stack:%d]", tid); } } @@ -182,11 +193,22 @@ static int nommu_vma_show(struct seq_file *m, struct vm_area_struct *vma) /* * display mapping lines for a particular process's /proc/pid/maps */ -static int show_map(struct seq_file *m, void *_p) +static int show_map(struct seq_file *m, void *_p, int is_pid) { struct rb_node *p = _p; - return nommu_vma_show(m, rb_entry(p, struct vm_area_struct, vm_rb)); + return nommu_vma_show(m, rb_entry(p, struct vm_area_struct, vm_rb), + is_pid); +} + +static int show_pid_map(struct seq_file *m, void *_p) +{ + return show_map(m, _p, 1); +} + +static int show_tid_map(struct seq_file *m, void *_p) +{ + return show_map(m, _p, 0); } static void *m_start(struct seq_file *m, loff_t *pos) @@ -240,10 +262,18 @@ static const struct seq_operations proc_pid_maps_ops = { .start = m_start, .next = m_next, .stop = m_stop, - .show = show_map + .show = show_pid_map +}; + +static const struct seq_operations proc_tid_maps_ops = { + .start = m_start, + .next = m_next, + .stop = m_stop, + .show = show_tid_map }; -static int maps_open(struct inode *inode, struct file *file) +static int maps_open(struct inode *inode, struct file *file, + const struct seq_operations *ops) { struct proc_maps_private *priv; int ret = -ENOMEM; @@ -251,7 +281,7 @@ static int maps_open(struct inode *inode, struct file *file) priv = kzalloc(sizeof(*priv), GFP_KERNEL); if (priv) { priv->pid = proc_pid(inode); - ret = seq_open(file, &proc_pid_maps_ops); + ret = seq_open(file, ops); if (!ret) { struct seq_file *m = file->private_data; m->private = priv; @@ -262,8 +292,25 @@ static int maps_open(struct inode *inode, struct file *file) return ret; } -const struct file_operations proc_maps_operations = { - .open = maps_open, +static int pid_maps_open(struct inode *inode, struct file *file) +{ + return maps_open(inode, file, &proc_pid_maps_ops); +} + +static int tid_maps_open(struct inode *inode, struct file *file) +{ + return maps_open(inode, file, &proc_tid_maps_ops); +} + +const struct file_operations proc_pid_maps_operations = { + .open = pid_maps_open, + .read = seq_read, + .llseek = seq_lseek, + .release = seq_release_private, +}; + +const struct file_operations proc_tid_maps_operations = { + .open = tid_maps_open, .read = seq_read, .llseek = seq_lseek, .release = seq_release_private, diff --git a/fs/seq_file.c b/fs/seq_file.c index 4023d6b..aa242dc 100644 --- a/fs/seq_file.c +++ b/fs/seq_file.c @@ -140,9 +140,21 @@ ssize_t seq_read(struct file *file, char __user *buf, size_t size, loff_t *ppos) mutex_lock(&m->lock); + /* + * seq_file->op->..m_start/m_stop/m_next may do special actions + * or optimisations based on the file->f_version, so we want to + * pass the file->f_version to those methods. + * + * seq_file->version is just copy of f_version, and seq_file + * methods can treat it simply as file version. + * It is copied in first and copied out after all operations. + * It is convenient to have it as part of structure to avoid the + * need of passing another argument to all the seq_file methods. + */ + m->version = file->f_version; + /* Don't assume *ppos is where we left it */ if (unlikely(*ppos != m->read_pos)) { - m->read_pos = *ppos; while ((err = traverse(m, *ppos)) == -EAGAIN) ; if (err) { @@ -152,21 +164,11 @@ ssize_t seq_read(struct file *file, char __user *buf, size_t size, loff_t *ppos) m->index = 0; m->count = 0; goto Done; + } else { + m->read_pos = *ppos; } } - /* - * seq_file->op->..m_start/m_stop/m_next may do special actions - * or optimisations based on the file->f_version, so we want to - * pass the file->f_version to those methods. - * - * seq_file->version is just copy of f_version, and seq_file - * methods can treat it simply as file version. - * It is copied in first and copied out after all operations. - * It is convenient to have it as part of structure to avoid the - * need of passing another argument to all the seq_file methods. - */ - m->version = file->f_version; /* grab buffer if we didn't have one */ if (!m->buf) { m->buf = kmalloc(m->size = PAGE_SIZE, GFP_KERNEL); |