Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1753994Ab3IWMGP (ORCPT ); Mon, 23 Sep 2013 08:06:15 -0400 Received: from mga14.intel.com ([143.182.124.37]:59137 "EHLO mga14.intel.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1753780Ab3IWMGH (ORCPT ); Mon, 23 Sep 2013 08:06:07 -0400 X-ExtLoop1: 1 X-IronPort-AV: E=Sophos;i="4.90,962,1371106800"; d="scan'208";a="298196436" From: "Kirill A. Shutemov" 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 , Ning Qu , Alexander Shishkin , linux-fsdevel@vger.kernel.org, linux-kernel@vger.kernel.org, "Kirill A. Shutemov" Subject: [PATCHv6 05/22] thp, mm: introduce mapping_can_have_hugepages() predicate Date: Mon, 23 Sep 2013 15:05:33 +0300 Message-Id: <1379937950-8411-6-git-send-email-kirill.shutemov@linux.intel.com> X-Mailer: git-send-email 1.8.4.rc3 In-Reply-To: <1379937950-8411-1-git-send-email-kirill.shutemov@linux.intel.com> References: <1379937950-8411-1-git-send-email-kirill.shutemov@linux.intel.com> Sender: linux-kernel-owner@vger.kernel.org List-ID: X-Mailing-List: linux-kernel@vger.kernel.org Content-Length: 1269 Lines: 41 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 | 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 -- To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to majordomo@vger.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/