Messages in this thread | | | Date | Wed, 15 Jun 2016 09:46:33 +0900 | From | Minchan Kim <> | Subject | Re: [PATCH v1 3/3] mm: per-process reclaim |
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On Mon, Jun 13, 2016 at 06:07:09PM +0800, Hillf Danton wrote: > > +static ssize_t reclaim_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; > > + int itype; > > + int rv; > > + enum reclaim_type type; > > + > > + 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 reclaim_type)itype; > > + if (type < RECLAIM_FILE || type > RECLAIM_ALL) > > + return -EINVAL; > > + > > + task = get_proc_task(file->f_path.dentry->d_inode); > > + if (!task) > > + return -ESRCH; > > + > > + mm = get_task_mm(task); > > + if (mm) { > > + struct mm_walk reclaim_walk = { > > + .pmd_entry = reclaim_pte_range, > > + .mm = mm, > > + }; > > + > > + down_read(&mm->mmap_sem); > > + for (vma = mm->mmap; vma; vma = vma->vm_next) { > > + reclaim_walk.private = vma; > > + > > + if (is_vm_hugetlb_page(vma)) > > + continue; > > + > > + if (!vma_is_anonymous(vma) && !(type & RECLAIM_FILE)) > > + continue; > > + > > + if (vma_is_anonymous(vma) && !(type & RECLAIM_ANON)) > > + continue; > > + > > + walk_page_range(vma->vm_start, vma->vm_end, > > + &reclaim_walk); > > Check fatal signal after reclaiming a mapping?
Yeb, We might need it in page_walker.
Thanks.
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