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 <[email protected]> > --- > 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 -- To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to [email protected] More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/
