From 76cb841cb886eef6b3bee341a2266c76578724ad Mon Sep 17 00:00:00 2001 From: Daniel Baumann Date: Mon, 6 May 2024 03:02:30 +0200 Subject: Adding upstream version 4.19.249. Signed-off-by: Daniel Baumann --- fs/proc/task_nommu.c | 302 +++++++++++++++++++++++++++++++++++++++++++++++++++ 1 file changed, 302 insertions(+) create mode 100644 fs/proc/task_nommu.c (limited to 'fs/proc/task_nommu.c') diff --git a/fs/proc/task_nommu.c b/fs/proc/task_nommu.c new file mode 100644 index 000000000..5161894a6 --- /dev/null +++ b/fs/proc/task_nommu.c @@ -0,0 +1,302 @@ +// SPDX-License-Identifier: GPL-2.0 + +#include +#include +#include +#include +#include +#include +#include +#include +#include + +#include "internal.h" + +/* + * Logic: we've got two memory sums for each process, "shared", and + * "non-shared". Shared memory may get counted more than once, for + * each process that owns it. Non-shared memory is counted + * accurately. + */ +void task_mem(struct seq_file *m, struct mm_struct *mm) +{ + struct vm_area_struct *vma; + struct vm_region *region; + struct rb_node *p; + unsigned long bytes = 0, sbytes = 0, slack = 0, size; + + down_read(&mm->mmap_sem); + for (p = rb_first(&mm->mm_rb); p; p = rb_next(p)) { + vma = rb_entry(p, struct vm_area_struct, vm_rb); + + bytes += kobjsize(vma); + + region = vma->vm_region; + if (region) { + size = kobjsize(region); + size += region->vm_end - region->vm_start; + } else { + size = vma->vm_end - vma->vm_start; + } + + if (atomic_read(&mm->mm_count) > 1 || + vma->vm_flags & VM_MAYSHARE) { + sbytes += size; + } else { + bytes += size; + if (region) + slack = region->vm_end - vma->vm_end; + } + } + + if (atomic_read(&mm->mm_count) > 1) + sbytes += kobjsize(mm); + else + bytes += kobjsize(mm); + + if (current->fs && current->fs->users > 1) + sbytes += kobjsize(current->fs); + else + bytes += kobjsize(current->fs); + + if (current->files && atomic_read(¤t->files->count) > 1) + sbytes += kobjsize(current->files); + else + bytes += kobjsize(current->files); + + if (current->sighand && atomic_read(¤t->sighand->count) > 1) + sbytes += kobjsize(current->sighand); + else + bytes += kobjsize(current->sighand); + + bytes += kobjsize(current); /* includes kernel stack */ + + seq_printf(m, + "Mem:\t%8lu bytes\n" + "Slack:\t%8lu bytes\n" + "Shared:\t%8lu bytes\n", + bytes, slack, sbytes); + + up_read(&mm->mmap_sem); +} + +unsigned long task_vsize(struct mm_struct *mm) +{ + struct vm_area_struct *vma; + struct rb_node *p; + unsigned long vsize = 0; + + down_read(&mm->mmap_sem); + for (p = rb_first(&mm->mm_rb); p; p = rb_next(p)) { + vma = rb_entry(p, struct vm_area_struct, vm_rb); + vsize += vma->vm_end - vma->vm_start; + } + up_read(&mm->mmap_sem); + return vsize; +} + +unsigned long task_statm(struct mm_struct *mm, + unsigned long *shared, unsigned long *text, + unsigned long *data, unsigned long *resident) +{ + struct vm_area_struct *vma; + struct vm_region *region; + struct rb_node *p; + unsigned long size = kobjsize(mm); + + down_read(&mm->mmap_sem); + for (p = rb_first(&mm->mm_rb); p; p = rb_next(p)) { + vma = rb_entry(p, struct vm_area_struct, vm_rb); + size += kobjsize(vma); + region = vma->vm_region; + if (region) { + size += kobjsize(region); + size += region->vm_end - region->vm_start; + } + } + + *text = (PAGE_ALIGN(mm->end_code) - (mm->start_code & PAGE_MASK)) + >> PAGE_SHIFT; + *data = (PAGE_ALIGN(mm->start_stack) - (mm->start_data & PAGE_MASK)) + >> PAGE_SHIFT; + up_read(&mm->mmap_sem); + size >>= PAGE_SHIFT; + size += *text + *data; + *resident = size; + return size; +} + +static int is_stack(struct vm_area_struct *vma) +{ + struct mm_struct *mm = vma->vm_mm; + + /* + * 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 <= mm->start_stack && + vma->vm_end >= mm->start_stack; +} + +/* + * display a single VMA to a sequenced file + */ +static int nommu_vma_show(struct seq_file *m, struct vm_area_struct *vma) +{ + struct mm_struct *mm = vma->vm_mm; + unsigned long ino = 0; + struct file *file; + dev_t dev = 0; + int flags; + unsigned long long pgoff = 0; + + flags = vma->vm_flags; + file = vma->vm_file; + + 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; + } + + seq_setwidth(m, 25 + sizeof(void *) * 6 - 1); + seq_printf(m, + "%08lx-%08lx %c%c%c%c %08llx %02x:%02x %lu ", + vma->vm_start, + vma->vm_end, + flags & VM_READ ? 'r' : '-', + flags & VM_WRITE ? 'w' : '-', + flags & VM_EXEC ? 'x' : '-', + flags & VM_MAYSHARE ? flags & VM_SHARED ? 'S' : 's' : 'p', + pgoff, + MAJOR(dev), MINOR(dev), ino); + + if (file) { + seq_pad(m, ' '); + seq_file_path(m, file, ""); + } else if (mm && is_stack(vma)) { + seq_pad(m, ' '); + seq_printf(m, "[stack]"); + } + + seq_putc(m, '\n'); + return 0; +} + +/* + * display mapping lines for a particular process's /proc/pid/maps + */ +static int show_map(struct seq_file *m, void *_p) +{ + struct rb_node *p = _p; + + return nommu_vma_show(m, rb_entry(p, struct vm_area_struct, vm_rb)); +} + +static void *m_start(struct seq_file *m, loff_t *pos) +{ + struct proc_maps_private *priv = m->private; + struct mm_struct *mm; + struct rb_node *p; + loff_t n = *pos; + + /* pin the task and mm whilst we play with them */ + priv->task = get_proc_task(priv->inode); + if (!priv->task) + return ERR_PTR(-ESRCH); + + mm = priv->mm; + if (!mm || !mmget_not_zero(mm)) + return NULL; + + if (down_read_killable(&mm->mmap_sem)) { + mmput(mm); + return ERR_PTR(-EINTR); + } + + /* start from the Nth VMA */ + for (p = rb_first(&mm->mm_rb); p; p = rb_next(p)) + if (n-- == 0) + return p; + + up_read(&mm->mmap_sem); + mmput(mm); + return NULL; +} + +static void m_stop(struct seq_file *m, void *_vml) +{ + struct proc_maps_private *priv = m->private; + + if (!IS_ERR_OR_NULL(_vml)) { + up_read(&priv->mm->mmap_sem); + mmput(priv->mm); + } + if (priv->task) { + put_task_struct(priv->task); + priv->task = NULL; + } +} + +static void *m_next(struct seq_file *m, void *_p, loff_t *pos) +{ + struct rb_node *p = _p; + + (*pos)++; + return p ? rb_next(p) : NULL; +} + +static const struct seq_operations proc_pid_maps_ops = { + .start = m_start, + .next = m_next, + .stop = m_stop, + .show = show_map +}; + +static int maps_open(struct inode *inode, struct file *file, + const struct seq_operations *ops) +{ + struct proc_maps_private *priv; + + priv = __seq_open_private(file, ops, sizeof(*priv)); + 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 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); + + return seq_release_private(inode, file); +} + +static int pid_maps_open(struct inode *inode, struct file *file) +{ + return maps_open(inode, file, &proc_pid_maps_ops); +} + +const struct file_operations proc_pid_maps_operations = { + .open = pid_maps_open, + .read = seq_read, + .llseek = seq_lseek, + .release = map_release, +}; + -- cgit v1.2.3