[PATCH 01/12] mm, thp, tmpfs: add function to alloc huge page for tmpfs

[Ning Qu]

Add function to alloc huge page for tmpfs when needed.

Signed-off-by: Ning Qu <qun...@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


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