f822566165
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: Michael S. Tsirkin <mst@mellanox.co.il> Acked-by: Hugh Dickins <hugh@veritas.com> Cc: Michael Kerrisk <mtk-manpages@gmx.net> Signed-off-by: Andrew Morton <akpm@osdl.org> Signed-off-by: Linus Torvalds <torvalds@osdl.org>
61 lines
2.8 KiB
C
61 lines
2.8 KiB
C
#ifndef __PARISC_MMAN_H__
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#define __PARISC_MMAN_H__
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#define PROT_READ 0x1 /* page can be read */
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#define PROT_WRITE 0x2 /* page can be written */
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#define PROT_EXEC 0x4 /* page can be executed */
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#define PROT_SEM 0x8 /* page may be used for atomic ops */
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#define PROT_NONE 0x0 /* page can not be accessed */
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#define PROT_GROWSDOWN 0x01000000 /* mprotect flag: extend change to start of growsdown vma */
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#define PROT_GROWSUP 0x02000000 /* mprotect flag: extend change to end of growsup vma */
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#define MAP_SHARED 0x01 /* Share changes */
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#define MAP_PRIVATE 0x02 /* Changes are private */
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#define MAP_TYPE 0x03 /* Mask for type of mapping */
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#define MAP_FIXED 0x04 /* Interpret addr exactly */
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#define MAP_ANONYMOUS 0x10 /* don't use a file */
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#define MAP_DENYWRITE 0x0800 /* ETXTBSY */
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#define MAP_EXECUTABLE 0x1000 /* mark it as an executable */
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#define MAP_LOCKED 0x2000 /* pages are locked */
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#define MAP_NORESERVE 0x4000 /* don't check for reservations */
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#define MAP_GROWSDOWN 0x8000 /* stack-like segment */
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#define MAP_POPULATE 0x10000 /* populate (prefault) pagetables */
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#define MAP_NONBLOCK 0x20000 /* do not block on IO */
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#define MS_SYNC 1 /* synchronous memory sync */
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#define MS_ASYNC 2 /* sync memory asynchronously */
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#define MS_INVALIDATE 4 /* invalidate the caches */
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#define MCL_CURRENT 1 /* lock all current mappings */
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#define MCL_FUTURE 2 /* lock all future mappings */
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#define MADV_NORMAL 0 /* no further special treatment */
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#define MADV_RANDOM 1 /* expect random page references */
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#define MADV_SEQUENTIAL 2 /* expect sequential page references */
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#define MADV_WILLNEED 3 /* will need these pages */
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#define MADV_DONTNEED 4 /* don't need these pages */
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#define MADV_SPACEAVAIL 5 /* insure that resources are reserved */
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#define MADV_VPS_PURGE 6 /* Purge pages from VM page cache */
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#define MADV_VPS_INHERIT 7 /* Inherit parents page size */
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#define MADV_REMOVE 8 /* remove these pages & resources */
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/* The range 12-64 is reserved for page size specification. */
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#define MADV_4K_PAGES 12 /* Use 4K pages */
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#define MADV_16K_PAGES 14 /* Use 16K pages */
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#define MADV_64K_PAGES 16 /* Use 64K pages */
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#define MADV_256K_PAGES 18 /* Use 256K pages */
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#define MADV_1M_PAGES 20 /* Use 1 Megabyte pages */
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#define MADV_4M_PAGES 22 /* Use 4 Megabyte pages */
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#define MADV_16M_PAGES 24 /* Use 16 Megabyte pages */
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#define MADV_64M_PAGES 26 /* Use 64 Megabyte pages */
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#define MADV_DONTFORK 0x30 /* dont inherit across fork */
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#define MADV_DOFORK 0x31 /* do inherit across fork */
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/* compatibility flags */
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#define MAP_ANON MAP_ANONYMOUS
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#define MAP_FILE 0
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#define MAP_VARIABLE 0
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#endif /* __PARISC_MMAN_H__ */
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