linux-kernel - Re: [PATCHv2, RFC 25/30] thp, mm: basic huge_fault implementation for generic_file_vm

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Date:	Fri, 15 Mar 2013 15:44:50 +0800
From:	Hillf Danton <dhillf@...il.com>
To:	"Kirill A. Shutemov" <kirill.shutemov@...ux.intel.com>
Cc:	Andrea Arcangeli <aarcange@...hat.com>,
	Andrew Morton <akpm@...ux-foundation.org>,
	Al Viro <viro@...iv.linux.org.uk>,
	Hugh Dickins <hughd@...gle.com>,
	Wu Fengguang <fengguang.wu@...el.com>, Jan Kara <jack@...e.cz>,
	Mel Gorman <mgorman@...e.de>, linux-mm@...ck.org,
	Andi Kleen <ak@...ux.intel.com>,
	Matthew Wilcox <matthew.r.wilcox@...el.com>,
	"Kirill A. Shutemov" <kirill@...temov.name>,
	linux-fsdevel@...r.kernel.org, linux-kernel@...r.kernel.org
Subject: Re: [PATCHv2, RFC 25/30] thp, mm: basic huge_fault implementation for generic_file_vm_ops

On Fri, Mar 15, 2013 at 1:50 AM, Kirill A. Shutemov
<kirill.shutemov@...ux.intel.com> wrote:
>
> +#ifdef CONFIG_TRANSPARENT_HUGEPAGE
> +static int filemap_huge_fault(struct vm_area_struct *vma, struct vm_fault *vmf)
> +{
> +       struct file *file = vma->vm_file;
> +       struct address_space *mapping = file->f_mapping;
> +       struct inode *inode = mapping->host;
> +       pgoff_t size, offset = vmf->pgoff;
> +       unsigned long address = (unsigned long) vmf->virtual_address;
> +       struct page *page;
> +       int ret = 0;
> +
> +       BUG_ON(((address >> PAGE_SHIFT) & HPAGE_CACHE_INDEX_MASK) !=
> +                       (offset & HPAGE_CACHE_INDEX_MASK));
> +
> +retry:
> +       page = find_get_page(mapping, offset);
> +       if (!page) {
> +               gfp_t gfp_mask = mapping_gfp_mask(mapping) | __GFP_COLD;
> +               page = alloc_pages(gfp_mask, HPAGE_PMD_ORDER);
s/pages/pages_vma/ ?

> +               if (!page) {
> +                       count_vm_event(THP_FAULT_FALLBACK);
> +                       return VM_FAULT_OOM;
> +               }
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