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Subject[PATCH 01/12] mm, thp, tmpfs: add function to alloc huge page for tmpfs
Add function to alloc huge page for tmpfs when needed.

Signed-off-by: Ning Qu <quning@gmail.com>
---
mm/shmem.c | 29 +++++++++++++++++++++++++++++
1 file changed, 29 insertions(+)

diff --git a/mm/shmem.c b/mm/shmem.c
index 8297623..a857ba8 100644
--- a/mm/shmem.c
+++ b/mm/shmem.c
@@ -949,6 +949,28 @@ static struct page *shmem_alloc_page(gfp_t gfp,

return page;
}
+
+static struct page *shmem_alloc_hugepage(gfp_t gfp,
+ struct shmem_inode_info *info, pgoff_t index)
+{
+ struct vm_area_struct pvma;
+ struct page *page;
+
+ /* Create a pseudo vma that just contains the policy */
+ pvma.vm_start = 0;
+ pvma.vm_pgoff = index;
+ pvma.vm_ops = NULL;
+ pvma.vm_policy = mpol_shared_policy_lookup(&info->policy, index);
+ pvma.vm_flags = VM_HUGEPAGE;
+
+ page = alloc_hugepage_vma(transparent_hugepage_defrag(&pvma), &pvma,
+ 0, numa_node_id(), gfp);
+
+ /* Drop reference taken by mpol_shared_policy_lookup() */
+ mpol_cond_put(pvma.vm_policy);
+
+ return page;
+}
#else /* !CONFIG_NUMA */
#ifdef CONFIG_TMPFS
static inline void shmem_show_mpol(struct seq_file *seq, struct mempolicy *mpol)
@@ -967,6 +989,13 @@ static inline struct page *shmem_alloc_page(gfp_t gfp,
{
return alloc_page(gfp);
}
+
+static inline struct page *shmem_alloc_hugepage(gfp_t gfp,
+ struct shmem_inode_info *info, pgoff_t index)
+{
+ BUG();
+ return NULL;
+}
#endif /* CONFIG_NUMA */

#if !defined(CONFIG_NUMA) || !defined(CONFIG_TMPFS)
--
1.8.4



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