Re: [PATCH 05/12] mm, thp, tmpfs: request huge page in shm_fault when needed

[Ning Qu]

Will fix this.
Best wishes,
-- 
Ning Qu (æå) | Software Engineer | quning@xxxxxxxxxx | +1-408-418-6066


On Tue, Oct 15, 2013 at 3:37 AM, Kirill A. Shutemov
<kirill.shutemov@xxxxxxxxxxxxxxx> 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@xxxxxxxxx>
>> ---
>>  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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