From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: from psmtp.com (na3sys010amx168.postini.com [74.125.245.168]) by kanga.kvack.org (Postfix) with SMTP id BE3056B0034 for ; Sat, 11 May 2013 21:21:33 -0400 (EDT) From: "Kirill A. Shutemov" Subject: [PATCHv4 09/39] thp, mm: introduce mapping_can_have_hugepages() predicate Date: Sun, 12 May 2013 04:23:06 +0300 Message-Id: <1368321816-17719-10-git-send-email-kirill.shutemov@linux.intel.com> In-Reply-To: <1368321816-17719-1-git-send-email-kirill.shutemov@linux.intel.com> References: <1368321816-17719-1-git-send-email-kirill.shutemov@linux.intel.com> Sender: owner-linux-mm@kvack.org List-ID: To: Andrea Arcangeli , Andrew Morton Cc: Al Viro , Hugh Dickins , Wu Fengguang , Jan Kara , Mel Gorman , linux-mm@kvack.org, Andi Kleen , Matthew Wilcox , "Kirill A. Shutemov" , Hillf Danton , Dave Hansen , linux-fsdevel@vger.kernel.org, linux-kernel@vger.kernel.org, "Kirill A. Shutemov" From: "Kirill A. Shutemov" 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 --- include/linux/pagemap.h | 12 ++++++++++++ 1 file changed, 12 insertions(+) diff --git a/include/linux/pagemap.h b/include/linux/pagemap.h index e3dea75..28597ec 100644 --- a/include/linux/pagemap.h +++ b/include/linux/pagemap.h @@ -84,6 +84,18 @@ 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) +{ + if (IS_ENABLED(CONFIG_TRANSPARENT_HUGEPAGE_PAGECACHE)) { + gfp_t gfp_mask = mapping_gfp_mask(m); + /* __GFP_COMP is key part of GFP_TRANSHUGE */ + return !!(gfp_mask & __GFP_COMP) && + transparent_hugepage_pagecache(); + } + + return false; +} + /* * The page cache can done in larger chunks than * one page, because it allows for more efficient -- 1.7.10.4 -- To unsubscribe, send a message with 'unsubscribe linux-mm' in the body to majordomo@kvack.org. For more info on Linux MM, see: http://www.linux-mm.org/ . Don't email: email@kvack.org