On 09/05, robert.f...@collabora.com wrote:
>
> @@ -2854,6 +2854,7 @@ static const struct pid_entry tgid_base_stuff[] = {
> REG("clear_refs", S_IWUSR, proc_clear_refs_operations),
> REG("smaps", S_IRUGO, proc_pid_smaps_operations),
> REG("pagemap", S_IRUSR, proc_pagemap_operations),
> + REG("totmaps", S_IRUGO, proc_totmaps_operations),
I must have missed something, but I fail to understand why this patch
is so complicated.
Just use ONE("totmaps", S_IRUGO, proc_totmaps_operations) ?
> +static int totmaps_proc_show(struct seq_file *m, void *data)
> +{
> + struct proc_maps_private *priv = m->private;
> + struct mm_struct *mm = priv->mm;
> + struct vm_area_struct *vma;
> + struct mem_size_stats mss_sum;
> +
> + memset(&mss_sum, 0, sizeof(mss_sum));
> + down_read(&mm->mmap_sem);
> + hold_task_mempolicy(priv);
^^^^^^^^^^^^^^^^^^^^^^^^^
why?
> + for (vma = mm->mmap; vma != priv->tail_vma; vma = vma->vm_next) {
Hmm. the usage of ->tail_vma looks just wrong. I guess the code should
work because it is NULL but still.
> + struct mem_size_stats mss;
> + struct mm_walk smaps_walk = {
> + .pmd_entry = smaps_pte_range,
> + .mm = vma->vm_mm,
> + .private = &mss,
> + };
> +
> + if (vma->vm_mm && !is_vm_hugetlb_page(vma)) {
> + memset(&mss, 0, sizeof(mss));
> + walk_page_vma(vma, &smaps_walk);
> + add_smaps_sum(&mss, &mss_sum);
> + }
> + }
Why? I mean, why not walk_page_range() ? You do not need this for-each-vma
loop at all? At least if you change this patch to use the ONE() helper, and
everything else looks unneeded in this case.
Oleg.
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