linux-kernel - Re: [PATCH 05/12] mm, thp, tmpfs: request huge page in shm

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Date:	Wed, 16 Oct 2013 11:29:58 -0700
From:	Ning Qu <quning@...gle.com>
To:	"Kirill A. Shutemov" <kirill.shutemov@...ux.intel.com>
Cc:	Andrea Arcangeli <aarcange@...hat.com>,
	Andrew Morton <akpm@...ux-foundation.org>,
	Hugh Dickins <hughd@...gle.com>,
	Al Viro <viro@...iv.linux.org.uk>,
	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 <willy@...ux.intel.com>,
	Hillf Danton <dhillf@...il.com>, Dave Hansen <dave@...1.net>,
	Alexander Shishkin <alexander.shishkin@...ux.intel.com>,
	linux-fsdevel@...r.kernel.org, linux-kernel@...r.kernel.org
Subject: Re: [PATCH 05/12] mm, thp, tmpfs: request huge page in shm_fault when needed

Fixed.
Best wishes,
-- 
Ning Qu (曲宁) | Software Engineer | quning@...gle.com | +1-408-418-6066


On Tue, Oct 15, 2013 at 11:49 AM, Ning Qu <quning@...gle.com> wrote:
> Will fix this.
> Best wishes,
> --
> Ning Qu (曲宁) | Software Engineer | quning@...gle.com | +1-408-418-6066
>
>
> On Tue, Oct 15, 2013 at 3:37 AM, Kirill A. Shutemov
> <kirill.shutemov@...ux.intel.com> wrote:
>> Ning Qu wrote:
>>> Add the function to request huge page in shm_fault when needed.
>>> And it will fall back to regular page if huge page can't be
>>> satisfied or allocated.
>>>
>>> If small page requested but huge page is found, the huge page will
>>> be splitted.
>>>
>>> Signed-off-by: Ning Qu <quning@...il.com>
>>> ---
>>>  mm/shmem.c | 32 +++++++++++++++++++++++++++++---
>>>  1 file changed, 29 insertions(+), 3 deletions(-)
>>>
>>> diff --git a/mm/shmem.c b/mm/shmem.c
>>> index 68a0e1d..2fc450d 100644
>>> --- a/mm/shmem.c
>>> +++ b/mm/shmem.c
>>> @@ -1472,19 +1472,45 @@ unlock:
>>>  static int shmem_fault(struct vm_area_struct *vma, struct vm_fault *vmf)
>>>  {
>>>       struct inode *inode = file_inode(vma->vm_file);
>>> +     struct page *page = NULL;
>>>       int error;
>>>       int ret = VM_FAULT_LOCKED;
>>>       gfp_t gfp = mapping_gfp_mask(inode->i_mapping);
>>> -
>>> -     error = shmem_getpage(inode, vmf->pgoff, &vmf->page, SGP_CACHE, gfp,
>>> -                             0, &ret);
>>> +     bool must_use_thp = vmf->flags & FAULT_FLAG_TRANSHUGE;
>>> +     int flags = 0;
>>> +#ifdef CONFIG_TRANSPARENT_HUGEPAGE_PAGECACHE
>>> +     flags |= AOP_FLAG_TRANSHUGE;
>>> +#endif
>>
>> ifdef is not needed: shmem_getpage will ignore AOP_FLAG_TRANSHUGE if
>> CONFIG_TRANSPARENT_HUGEPAGE_PAGECACHE is not defined.
>>
>> --
>>  Kirill A. Shutemov
--
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