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Date: Fri, 17 Jul 2009 20:30:43 +0300 From: Izik Eidus <ieidus@...hat.com> To: akpm@...ux-foundation.org Cc: hugh.dickins@...cali.co.uk, aarcange@...hat.com, chrisw@...hat.com, avi@...hat.com, riel@...hat.com, linux-kernel@...r.kernel.org, linux-mm@...ck.org, nickpiggin@...oo.com.au, ieidus@...hat.com, Michael Kerrisk <mtk.manpages@...il.com>, Richard Henderson <rth@...ddle.net>, Ivan Kokshaysky <ink@...assic.park.msu.ru>, Ralf Baechle <ralf@...ux-mips.org>, Kyle McMartin <kyle@...artin.ca>, Helge Deller <deller@....de>, Chris Zankel <chris@...kel.net> Subject: [PATCH 03/10] ksm: define MADV_MERGEABLE and MADV_UNMERGEABLE From: Hugh Dickins <hugh.dickins@...cali.co.uk> 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 <hugh.dickins@...cali.co.uk> Signed-off-by: Chris Wright <chrisw@...hat.com> Signed-off-by: Izik Eidus <ieidus@...hat.com> Cc: Michael Kerrisk <mtk.manpages@...il.com> Cc: Richard Henderson <rth@...ddle.net> Cc: Ivan Kokshaysky <ink@...assic.park.msu.ru> Cc: Ralf Baechle <ralf@...ux-mips.org> Cc: Kyle McMartin <kyle@...artin.ca> Cc: Helge Deller <deller@....de> Cc: Chris Zankel <chris@...kel.net> --- 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 from this list: send the line "unsubscribe linux-kernel" in the body of a message to majordomo@...r.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/
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