From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: from mail191.messagelabs.com (mail191.messagelabs.com [216.82.242.19]) by kanga.kvack.org (Postfix) with SMTP id 311FF6B005D for ; Fri, 17 Jul 2009 13:27:24 -0400 (EDT) From: Izik Eidus Subject: [PATCH 03/10] ksm: define MADV_MERGEABLE and MADV_UNMERGEABLE Date: Fri, 17 Jul 2009 20:30:43 +0300 Message-Id: <1247851850-4298-4-git-send-email-ieidus@redhat.com> In-Reply-To: <1247851850-4298-3-git-send-email-ieidus@redhat.com> References: <1247851850-4298-1-git-send-email-ieidus@redhat.com> <1247851850-4298-2-git-send-email-ieidus@redhat.com> <1247851850-4298-3-git-send-email-ieidus@redhat.com> Sender: owner-linux-mm@kvack.org To: akpm@linux-foundation.org Cc: hugh.dickins@tiscali.co.uk, aarcange@redhat.com, chrisw@redhat.com, avi@redhat.com, riel@redhat.com, linux-kernel@vger.kernel.org, linux-mm@kvack.org, nickpiggin@yahoo.com.au, ieidus@redhat.com, Michael Kerrisk , Richard Henderson , Ivan Kokshaysky , Ralf Baechle , Kyle McMartin , Helge Deller , Chris Zankel List-ID: From: Hugh Dickins The out-of-tree KSM used ioctls on fds cloned from /dev/ksm to register a memory area for merging: we prefer now to use an madvise(2) interface. This patch just defines MADV_MERGEABLE (to tell KSM it may merge pages in this area found identical to pages in other mergeable areas) and MADV_UNMERGEABLE (to undo that). Most architectures use asm-generic, but alpha, mips, parisc, xtensa need their own definitions: included here for mmotm convenience, but we'll probably want to split this and feed pieces to arch maintainers. Based upon earlier patches by Chris Wright and Izik Eidus. Signed-off-by: Hugh Dickins Signed-off-by: Chris Wright Signed-off-by: Izik Eidus Cc: Michael Kerrisk Cc: Richard Henderson Cc: Ivan Kokshaysky Cc: Ralf Baechle Cc: Kyle McMartin Cc: Helge Deller Cc: Chris Zankel --- arch/alpha/include/asm/mman.h | 3 +++ arch/mips/include/asm/mman.h | 3 +++ arch/parisc/include/asm/mman.h | 3 +++ arch/xtensa/include/asm/mman.h | 3 +++ include/asm-generic/mman-common.h | 3 +++ 5 files changed, 15 insertions(+), 0 deletions(-) diff --git a/arch/alpha/include/asm/mman.h b/arch/alpha/include/asm/mman.h index 90d7c35..c77c557 100644 --- a/arch/alpha/include/asm/mman.h +++ b/arch/alpha/include/asm/mman.h @@ -48,6 +48,9 @@ #define MADV_DONTFORK 10 /* don't inherit across fork */ #define MADV_DOFORK 11 /* do inherit across fork */ +#define MADV_MERGEABLE 12 /* KSM may merge identical pages */ +#define MADV_UNMERGEABLE 13 /* KSM may not merge identical pages */ + /* compatibility flags */ #define MAP_FILE 0 diff --git a/arch/mips/include/asm/mman.h b/arch/mips/include/asm/mman.h index e4d6f1f..f15554d 100644 --- a/arch/mips/include/asm/mman.h +++ b/arch/mips/include/asm/mman.h @@ -71,6 +71,9 @@ #define MADV_DONTFORK 10 /* don't inherit across fork */ #define MADV_DOFORK 11 /* do inherit across fork */ +#define MADV_MERGEABLE 12 /* KSM may merge identical pages */ +#define MADV_UNMERGEABLE 13 /* KSM may not merge identical pages */ + /* compatibility flags */ #define MAP_FILE 0 diff --git a/arch/parisc/include/asm/mman.h b/arch/parisc/include/asm/mman.h index defe752..a12d9d4 100644 --- a/arch/parisc/include/asm/mman.h +++ b/arch/parisc/include/asm/mman.h @@ -54,6 +54,9 @@ #define MADV_16M_PAGES 24 /* Use 16 Megabyte pages */ #define MADV_64M_PAGES 26 /* Use 64 Megabyte pages */ +#define MADV_MERGEABLE 65 /* KSM may merge identical pages */ +#define MADV_UNMERGEABLE 66 /* KSM may not merge identical pages */ + /* compatibility flags */ #define MAP_FILE 0 #define MAP_VARIABLE 0 diff --git a/arch/xtensa/include/asm/mman.h b/arch/xtensa/include/asm/mman.h index 9b92620..6e55b4d 100644 --- a/arch/xtensa/include/asm/mman.h +++ b/arch/xtensa/include/asm/mman.h @@ -78,6 +78,9 @@ #define MADV_DONTFORK 10 /* don't inherit across fork */ #define MADV_DOFORK 11 /* do inherit across fork */ +#define MADV_MERGEABLE 12 /* KSM may merge identical pages */ +#define MADV_UNMERGEABLE 13 /* KSM may not merge identical pages */ + /* compatibility flags */ #define MAP_FILE 0 diff --git a/include/asm-generic/mman-common.h b/include/asm-generic/mman-common.h index 3b69ad3..dd63bd3 100644 --- a/include/asm-generic/mman-common.h +++ b/include/asm-generic/mman-common.h @@ -35,6 +35,9 @@ #define MADV_DONTFORK 10 /* don't inherit across fork */ #define MADV_DOFORK 11 /* do inherit across fork */ +#define MADV_MERGEABLE 12 /* KSM may merge identical pages */ +#define MADV_UNMERGEABLE 13 /* KSM may not merge identical pages */ + /* compatibility flags */ #define MAP_FILE 0 -- 1.5.6.5 -- 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