Thread (67 messages) 67 messages, 4 authors, 2017-02-13

[PATCHv6 16/37] thp: make thp_get_unmapped_area() respect S_HUGE_MODE

From: Kirill A. Shutemov <hidden>
Date: 2017-01-26 11:57:58
Also in: linux-ext4, linux-fsdevel, linux-mm, lkml
Subsystem: memory management, memory management - thp (transparent huge page), the rest · Maintainers: Andrew Morton, David Hildenbrand, Lorenzo Stoakes, Linus Torvalds

We want mmap(NULL) to return PMD-aligned address if the inode can have
huge pages in page cache.

Signed-off-by: Kirill A. Shutemov <redacted>
---
 mm/huge_memory.c | 4 +++-
 1 file changed, 3 insertions(+), 1 deletion(-)
diff --git a/mm/huge_memory.c b/mm/huge_memory.c
index 55aee62e8444..2b1d8d13e2c3 100644
--- a/mm/huge_memory.c
+++ b/mm/huge_memory.c
@@ -528,10 +528,12 @@ unsigned long thp_get_unmapped_area(struct file *filp, unsigned long addr,
 		unsigned long len, unsigned long pgoff, unsigned long flags)
 {
 	loff_t off = (loff_t)pgoff << PAGE_SHIFT;
+	struct inode *inode = filp->f_mapping->host;
 
 	if (addr)
 		goto out;
-	if (!IS_DAX(filp->f_mapping->host) || !IS_ENABLED(CONFIG_FS_DAX_PMD))
+	if ((inode->i_flags & S_HUGE_MODE) == S_HUGE_NEVER &&
+			(!IS_DAX(inode) || !IS_ENABLED(CONFIG_FS_DAX_PMD)))
 		goto out;
 
 	addr = __thp_get_unmapped_area(filp, len, off, flags, PMD_SIZE);
-- 
2.11.0
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