From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: from mail-oi0-f45.google.com (mail-oi0-f45.google.com [209.85.218.45]) by kanga.kvack.org (Postfix) with ESMTP id 9EE8D900016 for ; Thu, 4 Jun 2015 09:14:50 -0400 (EDT) Received: by oihd6 with SMTP id d6so30834384oih.2 for ; Thu, 04 Jun 2015 06:14:50 -0700 (PDT) Received: from szxga03-in.huawei.com (szxga03-in.huawei.com. [119.145.14.66]) by mx.google.com with ESMTPS id v23si1652906oia.4.2015.06.04.06.14.48 for (version=TLSv1 cipher=RC4-SHA bits=128/128); Thu, 04 Jun 2015 06:14:50 -0700 (PDT) Message-ID: <55704C4D.9070508@huawei.com> Date: Thu, 4 Jun 2015 21:02:05 +0800 From: Xishi Qiu MIME-Version: 1.0 Subject: [RFC PATCH 07/12] mm: introduce __GFP_MIRROR to allocate mirrored pages References: <55704A7E.5030507@huawei.com> In-Reply-To: <55704A7E.5030507@huawei.com> Content-Type: text/plain; charset="ISO-8859-1" Content-Transfer-Encoding: 7bit Sender: owner-linux-mm@kvack.org List-ID: To: Xishi Qiu , Andrew Morton , nao.horiguchi@gmail.com, Yinghai Lu , "H. Peter Anvin" , Thomas Gleixner , mingo@elte.hu, Xiexiuqi , Hanjun Guo , "Luck, Tony" Cc: Linux MM , LKML This patch introduces a new gfp flag called "__GFP_MIRROR", it is used to allocate mirrored pages through buddy system. Signed-off-by: Xishi Qiu --- include/linux/gfp.h | 5 ++++- 1 file changed, 4 insertions(+), 1 deletion(-) diff --git a/include/linux/gfp.h b/include/linux/gfp.h index 15928f0..89d0091 100644 --- a/include/linux/gfp.h +++ b/include/linux/gfp.h @@ -35,6 +35,7 @@ struct vm_area_struct; #define ___GFP_NO_KSWAPD 0x400000u #define ___GFP_OTHER_NODE 0x800000u #define ___GFP_WRITE 0x1000000u +#define ___GFP_MIRROR 0x2000000u /* If the above are modified, __GFP_BITS_SHIFT may need updating */ /* @@ -95,13 +96,15 @@ struct vm_area_struct; #define __GFP_OTHER_NODE ((__force gfp_t)___GFP_OTHER_NODE) /* On behalf of other node */ #define __GFP_WRITE ((__force gfp_t)___GFP_WRITE) /* Allocator intends to dirty page */ +#define __GFP_MIRROR ((__force gfp_t)___GFP_MIRROR) /* Allocate mirrored memory */ + /* * This may seem redundant, but it's a way of annotating false positives vs. * allocations that simply cannot be supported (e.g. page tables). */ #define __GFP_NOTRACK_FALSE_POSITIVE (__GFP_NOTRACK) -#define __GFP_BITS_SHIFT 25 /* Room for N __GFP_FOO bits */ +#define __GFP_BITS_SHIFT 26 /* Room for N __GFP_FOO bits */ #define __GFP_BITS_MASK ((__force gfp_t)((1 << __GFP_BITS_SHIFT) - 1)) /* This equals 0, but use constants in case they ever change */ -- 2.0.0 -- 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