[PATCHv6 05/22] thp, mm: introduce mapping_can_have_hugepages() predicate
From: Kirill A. Shutemov <hidden>
Date: 2013-09-23 12:05:33
Also in:
linux-fsdevel, lkml
Subsystem:
page cache, the rest · Maintainers:
Matthew Wilcox, Linus Torvalds
Returns true if mapping can have huge pages. Just check for __GFP_COMP in gfp mask of the mapping for now. Signed-off-by: Kirill A. Shutemov <redacted> --- include/linux/pagemap.h | 14 ++++++++++++++ 1 file changed, 14 insertions(+)
diff --git a/include/linux/pagemap.h b/include/linux/pagemap.h
index e3dea75a07..ad60dcc50e 100644
--- a/include/linux/pagemap.h
+++ b/include/linux/pagemap.h@@ -84,6 +84,20 @@ static inline void mapping_set_gfp_mask(struct address_space *m, gfp_t mask) (__force unsigned long)mask; } +static inline bool mapping_can_have_hugepages(struct address_space *m) +{ + gfp_t gfp_mask = mapping_gfp_mask(m); + + if (!transparent_hugepage_pagecache()) + return false; + + /* + * It's up to filesystem what gfp mask to use. + * The only part of GFP_TRANSHUGE which matters for us is __GFP_COMP. + */ + return !!(gfp_mask & __GFP_COMP); +} + /* * The page cache can done in larger chunks than * one page, because it allows for more efficient
--
1.8.4.rc3
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