d19f352484
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@tiscali.co.uk> Signed-off-by: Chris Wright <chrisw@redhat.com> Signed-off-by: Izik Eidus <ieidus@redhat.com> Cc: Michael Kerrisk <mtk.manpages@gmail.com> Cc: Richard Henderson <rth@twiddle.net> Cc: Ivan Kokshaysky <ink@jurassic.park.msu.ru> Cc: Ralf Baechle <ralf@linux-mips.org> Cc: Kyle McMartin <kyle@mcmartin.ca> Cc: Helge Deller <deller@gmx.de> Cc: Chris Zankel <chris@zankel.net> Cc: Andrea Arcangeli <aarcange@redhat.com> Cc: Rik van Riel <riel@redhat.com> Cc: Wu Fengguang <fengguang.wu@intel.com> Cc: Balbir Singh <balbir@in.ibm.com> Cc: Hugh Dickins <hugh.dickins@tiscali.co.uk> Cc: KAMEZAWA Hiroyuki <kamezawa.hiroyu@jp.fujitsu.com> Cc: Lee Schermerhorn <lee.schermerhorn@hp.com> Cc: Avi Kivity <avi@redhat.com> Cc: Nick Piggin <nickpiggin@yahoo.com.au> Signed-off-by: Andrew Morton <akpm@linux-foundation.org> Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
58 lines
2.4 KiB
C
58 lines
2.4 KiB
C
#ifndef __ALPHA_MMAN_H__
|
|
#define __ALPHA_MMAN_H__
|
|
|
|
#define PROT_READ 0x1 /* page can be read */
|
|
#define PROT_WRITE 0x2 /* page can be written */
|
|
#define PROT_EXEC 0x4 /* page can be executed */
|
|
#define PROT_SEM 0x8 /* page may be used for atomic ops */
|
|
#define PROT_NONE 0x0 /* page can not be accessed */
|
|
#define PROT_GROWSDOWN 0x01000000 /* mprotect flag: extend change to start of growsdown vma */
|
|
#define PROT_GROWSUP 0x02000000 /* mprotect flag: extend change to end of growsup vma */
|
|
|
|
#define MAP_SHARED 0x01 /* Share changes */
|
|
#define MAP_PRIVATE 0x02 /* Changes are private */
|
|
#define MAP_TYPE 0x0f /* Mask for type of mapping (OSF/1 is _wrong_) */
|
|
#define MAP_FIXED 0x100 /* Interpret addr exactly */
|
|
#define MAP_ANONYMOUS 0x10 /* don't use a file */
|
|
|
|
/* not used by linux, but here to make sure we don't clash with OSF/1 defines */
|
|
#define _MAP_HASSEMAPHORE 0x0200
|
|
#define _MAP_INHERIT 0x0400
|
|
#define _MAP_UNALIGNED 0x0800
|
|
|
|
/* These are linux-specific */
|
|
#define MAP_GROWSDOWN 0x01000 /* stack-like segment */
|
|
#define MAP_DENYWRITE 0x02000 /* ETXTBSY */
|
|
#define MAP_EXECUTABLE 0x04000 /* mark it as an executable */
|
|
#define MAP_LOCKED 0x08000 /* lock the mapping */
|
|
#define MAP_NORESERVE 0x10000 /* don't check for reservations */
|
|
#define MAP_POPULATE 0x20000 /* populate (prefault) pagetables */
|
|
#define MAP_NONBLOCK 0x40000 /* do not block on IO */
|
|
|
|
#define MS_ASYNC 1 /* sync memory asynchronously */
|
|
#define MS_SYNC 2 /* synchronous memory sync */
|
|
#define MS_INVALIDATE 4 /* invalidate the caches */
|
|
|
|
#define MCL_CURRENT 8192 /* lock all currently mapped pages */
|
|
#define MCL_FUTURE 16384 /* lock all additions to address space */
|
|
|
|
#define MADV_NORMAL 0 /* no further special treatment */
|
|
#define MADV_RANDOM 1 /* expect random page references */
|
|
#define MADV_SEQUENTIAL 2 /* expect sequential page references */
|
|
#define MADV_WILLNEED 3 /* will need these pages */
|
|
#define MADV_SPACEAVAIL 5 /* ensure resources are available */
|
|
#define MADV_DONTNEED 6 /* don't need these pages */
|
|
|
|
/* common/generic parameters */
|
|
#define MADV_REMOVE 9 /* remove these pages & resources */
|
|
#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
|
|
|
|
#endif /* __ALPHA_MMAN_H__ */
|