Commit f8225661 authored by Michael S. Tsirkin's avatar Michael S. Tsirkin Committed by Linus Torvalds
Browse files

[PATCH] madvise MADV_DONTFORK/MADV_DOFORK 



Currently, copy-on-write may change the physical address of a page even if the
user requested that the page is pinned in memory (either by mlock or by
get_user_pages).  This happens if the process forks meanwhile, and the parent
writes to that page.  As a result, the page is orphaned: in case of
get_user_pages, the application will never see any data hardware DMA's into
this page after the COW.  In case of mlock'd memory, the parent is not getting
the realtime/security benefits of mlock.

In particular, this affects the Infiniband modules which do DMA from and into
user pages all the time.

This patch adds madvise options to control whether memory range is inherited
across fork.  Useful e.g.  for when hardware is doing DMA from/into these
pages.  Could also be useful to an application wanting to speed up its forks
by cutting large areas out of consideration.

Signed-off-by: default avatarMichael S. Tsirkin <mst@mellanox.co.il>
Acked-by: default avatarHugh Dickins <hugh@veritas.com>
Cc: Michael Kerrisk <mtk-manpages@gmx.net>
Signed-off-by: default avatarAndrew Morton <akpm@osdl.org>
Signed-off-by: default avatarLinus Torvalds <torvalds@osdl.org>
parent 8861da31

include/asm-alpha/mman.h

+2 −0
Original line number Diff line number Diff line
@@ -43,6 +43,8 @@ 
#define	MADV_SPACEAVAIL	5		/* ensure resources are available */

#define MADV_DONTNEED	6		/* don't need these pages */

#define MADV_REMOVE	7		/* remove these pages & resources */

#define MADV_DONTFORK	0x30		/* dont inherit across fork */

#define MADV_DOFORK	0x31		/* do inherit across fork */



/* compatibility flags */

#define MAP_ANON	MAP_ANONYMOUS

include/asm-arm/mman.h

+2 −0
Original line number Diff line number Diff line
@@ -36,6 +36,8 @@ 
#define MADV_WILLNEED	0x3		/* pre-fault pages */

#define MADV_DONTNEED	0x4		/* discard these pages */

#define MADV_REMOVE	0x5		/* remove these pages & resources */

#define MADV_DONTFORK	0x30		/* dont inherit across fork */

#define MADV_DOFORK	0x31		/* do inherit across fork */



/* compatibility flags */

#define MAP_ANON	MAP_ANONYMOUS

include/asm-arm26/mman.h

+2 −0
Original line number Diff line number Diff line
@@ -36,6 +36,8 @@ 
#define MADV_WILLNEED	0x3		/* pre-fault pages */

#define MADV_DONTNEED	0x4		/* discard these pages */

#define MADV_REMOVE	0x5		/* remove these pages & resources */

#define MADV_DONTFORK	0x30		/* dont inherit across fork */

#define MADV_DOFORK	0x31		/* do inherit across fork */



/* compatibility flags */

#define MAP_ANON	MAP_ANONYMOUS

include/asm-cris/mman.h

+2 −0
Original line number Diff line number Diff line
@@ -38,6 +38,8 @@ 
#define MADV_WILLNEED	0x3		/* pre-fault pages */

#define MADV_DONTNEED	0x4		/* discard these pages */

#define MADV_REMOVE	0x5		/* remove these pages & resources */

#define MADV_DONTFORK	0x30		/* dont inherit across fork */

#define MADV_DOFORK	0x31		/* do inherit across fork */



/* compatibility flags */

#define MAP_ANON	MAP_ANONYMOUS

include/asm-frv/mman.h

+2 −0
Original line number Diff line number Diff line
@@ -36,6 +36,8 @@ 
#define MADV_WILLNEED	0x3		/* pre-fault pages */

#define MADV_DONTNEED	0x4		/* discard these pages */

#define MADV_REMOVE	0x5		/* remove these pages & resources */

#define MADV_DONTFORK	0x30		/* dont inherit across fork */

#define MADV_DOFORK	0x31		/* do inherit across fork */



/* compatibility flags */

#define MAP_ANON	MAP_ANONYMOUS

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