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Michael S. Tsirkin f822566165 [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: 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>		19 years ago
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a.out.h	Linux-2.6.12-rc2	20 years ago
assembler.h	Linux-2.6.12-rc2	20 years ago
atomic.h	[PATCH] mutex subsystem, add atomic_xchg() to all arches	19 years ago
auxvec.h	[PATCH] auxiliary vector cleanups	20 years ago
bitops.h	[PATCH] arm26: fix find_first_zero_bit related warnings	19 years ago
bug.h	[PATCH] remove all kernel BUGs	20 years ago
bugs.h	Linux-2.6.12-rc2	20 years ago
byteorder.h	Linux-2.6.12-rc2	20 years ago
cache.h	[PATCH] arm26: add L1_CACHE_SHIFT	19 years ago
cacheflush.h	Linux-2.6.12-rc2	20 years ago
checksum.h	Linux-2.6.12-rc2	20 years ago
constants.h	Linux-2.6.12-rc2	20 years ago
cputime.h	Linux-2.6.12-rc2	20 years ago
current.h	Linux-2.6.12-rc2	20 years ago
delay.h	Linux-2.6.12-rc2	20 years ago
div64.h	Linux-2.6.12-rc2	20 years ago
dma-mapping.h	Linux-2.6.12-rc2	20 years ago
dma.h	Linux-2.6.12-rc2	20 years ago
ecard.h	Linux-2.6.12-rc2	20 years ago
elf.h	[PATCH] ARM: 2696/1: remove ';' in ELF_DATA define in asm-arm{,26}/elf.h	20 years ago
emergency-restart.h	[PATCH] Add emergency_restart()	20 years ago
errno.h	Linux-2.6.12-rc2	20 years ago
fcntl.h	[PATCH] Clean up struct flock64 definitions	20 years ago
fiq.h	Linux-2.6.12-rc2	20 years ago
floppy.h	Linux-2.6.12-rc2	20 years ago
fpstate.h	Linux-2.6.12-rc2	20 years ago
futex.h	[PATCH] consolidate asm/futex.h	19 years ago
hardirq.h	[PATCH] arm26: remove irq_exit() from hardirq.h	19 years ago
hardware.h	Linux-2.6.12-rc2	20 years ago
ide.h	Linux-2.6.12-rc2	20 years ago
io.h	Linux-2.6.12-rc2	20 years ago
ioc.h	Linux-2.6.12-rc2	20 years ago
ioctl.h	[PATCH] Generic ioctl.h	19 years ago
ioctls.h	Linux-2.6.12-rc2	20 years ago
ipc.h	Linux-2.6.12-rc2	20 years ago
ipcbuf.h	Linux-2.6.12-rc2	20 years ago
irq.h	Linux-2.6.12-rc2	20 years ago
irqchip.h	Linux-2.6.12-rc2	20 years ago
kmap_types.h	Linux-2.6.12-rc2	20 years ago
leds.h	Linux-2.6.12-rc2	20 years ago
limits.h	Linux-2.6.12-rc2	20 years ago
linkage.h	Linux-2.6.12-rc2	20 years ago
local.h	Linux-2.6.12-rc2	20 years ago
locks.h	Linux-2.6.12-rc2	20 years ago
mach-types.h	Linux-2.6.12-rc2	20 years ago
map.h	Linux-2.6.12-rc2	20 years ago
mc146818rtc.h	Linux-2.6.12-rc2	20 years ago
memory.h	Linux-2.6.12-rc2	20 years ago
mman.h	[PATCH] madvise MADV_DONTFORK/MADV_DOFORK	19 years ago
mmu.h	Linux-2.6.12-rc2	20 years ago
mmu_context.h	Linux-2.6.12-rc2	20 years ago
module.h	Linux-2.6.12-rc2	20 years ago
msgbuf.h	Linux-2.6.12-rc2	20 years ago
namei.h	Linux-2.6.12-rc2	20 years ago
oldlatches.h	Linux-2.6.12-rc2	20 years ago
page.h	[PATCH] mm: consolidate get_order	20 years ago
param.h	Linux-2.6.12-rc2	20 years ago
parport.h	Linux-2.6.12-rc2	20 years ago
pci.h	Linux-2.6.12-rc2	20 years ago
percpu.h	Linux-2.6.12-rc2	20 years ago
pgalloc.h	Linux-2.6.12-rc2	20 years ago
pgtable.h	[PATCH] vm: remove unused/broken page_pte[_prot] macros	20 years ago
poll.h	Linux-2.6.12-rc2	20 years ago
posix_types.h	[PATCH] arm26: add __kernel_old_dev_t for nfsd	19 years ago
proc-fns.h	Linux-2.6.12-rc2	20 years ago
processor.h	Linux-2.6.12-rc2	20 years ago
procinfo.h	Linux-2.6.12-rc2	20 years ago
ptrace.h	Linux-2.6.12-rc2	20 years ago
resource.h	Linux-2.6.12-rc2	20 years ago
scatterlist.h	Linux-2.6.12-rc2	20 years ago
sections.h	Linux-2.6.12-rc2	20 years ago
segment.h	Linux-2.6.12-rc2	20 years ago
semaphore-helper.h	Linux-2.6.12-rc2	20 years ago
semaphore.h	[PATCH] semaphore: Remove __MUTEX_INITIALIZER()	20 years ago
sembuf.h	Linux-2.6.12-rc2	20 years ago
serial.h	[PATCH] Serial: Split 8250 port table (part 2)	20 years ago
setup.h	Linux-2.6.12-rc2	20 years ago
shmbuf.h	Linux-2.6.12-rc2	20 years ago
shmparam.h	Linux-2.6.12-rc2	20 years ago
sigcontext.h	Linux-2.6.12-rc2	20 years ago
siginfo.h	Linux-2.6.12-rc2	20 years ago
signal.h	[PATCH] Remove obsolete HAVE_ARCH_GET_SIGNAL_TO_DELIVER?	20 years ago
sizes.h	Linux-2.6.12-rc2	20 years ago
smp.h	Linux-2.6.12-rc2	20 years ago
socket.h	[NET]: Introduce SO_{SND,RCV}BUFFORCE socket options	20 years ago
sockios.h	Linux-2.6.12-rc2	20 years ago
spinlock.h	Linux-2.6.12-rc2	20 years ago
stat.h	Linux-2.6.12-rc2	20 years ago
statfs.h	Linux-2.6.12-rc2	20 years ago
string.h	Linux-2.6.12-rc2	20 years ago
suspend.h	Linux-2.6.12-rc2	20 years ago
sysirq.h	Linux-2.6.12-rc2	20 years ago
system.h	[PATCH] arm26: drop first arg of prepare_arch_switch, finish_arch_switch	19 years ago
termbits.h	Linux-2.6.12-rc2	20 years ago
termios.h	Linux-2.6.12-rc2	20 years ago
thread_info.h	[PATCH] fix arm26 THREAD_SIZE	19 years ago
timex.h	Linux-2.6.12-rc2	20 years ago
tlb.h	[PATCH] mm: tlb_finish_mmu forget rss	20 years ago
tlbflush.h	Linux-2.6.12-rc2	20 years ago
topology.h	Linux-2.6.12-rc2	20 years ago
types.h	[PATCH] sab: consolidate kmem_bufctl_t	20 years ago
uaccess-asm.h	Linux-2.6.12-rc2	20 years ago
uaccess.h	[PATCH] remove verify_area(): remove verify_area() from various uaccess.h headers	20 years ago
ucontext.h	Linux-2.6.12-rc2	20 years ago
unaligned.h	Linux-2.6.12-rc2	20 years ago
uncompress.h	Linux-2.6.12-rc2	20 years ago
unistd.h	[PATCH] unify sys_ptrace prototype	20 years ago
user.h	Linux-2.6.12-rc2	20 years ago
xor.h	Linux-2.6.12-rc2	20 years ago