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linux/include/asm-arm26
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>
2006-02-14 16:09:34 -08:00
..
a.out.h
assembler.h
atomic.h [PATCH] mutex subsystem, add atomic_xchg() to all arches 2006-01-09 15:59:17 -08:00
auxvec.h
bitops.h [PATCH] arm26: fix find_first_zero_bit related warnings 2006-02-01 08:53:21 -08:00
bug.h
bugs.h
byteorder.h
cache.h [PATCH] arm26: add L1_CACHE_SHIFT 2006-01-16 23:15:26 -08:00
cacheflush.h
checksum.h
constants.h
cputime.h
current.h
delay.h
div64.h
dma-mapping.h
dma.h
ecard.h
elf.h
emergency-restart.h
errno.h
fcntl.h
fiq.h
floppy.h
fpstate.h
futex.h [PATCH] consolidate asm/futex.h 2006-01-08 20:13:39 -08:00
hardirq.h [PATCH] arm26: remove irq_exit() from hardirq.h 2006-02-01 08:53:21 -08:00
hardware.h
ide.h
io.h
ioc.h
ioctl.h [PATCH] Generic ioctl.h 2006-01-10 08:01:34 -08:00
ioctls.h
ipc.h
ipcbuf.h
irq.h
irqchip.h
kmap_types.h
leds.h
limits.h
linkage.h
local.h
locks.h
mach-types.h
map.h
mc146818rtc.h
memory.h
mman.h [PATCH] madvise MADV_DONTFORK/MADV_DOFORK 2006-02-14 16:09:34 -08:00
mmu_context.h
mmu.h
module.h
msgbuf.h
namei.h
oldlatches.h
page.h
param.h
parport.h
pci.h
percpu.h
pgalloc.h
pgtable.h
poll.h
posix_types.h [PATCH] arm26: add __kernel_old_dev_t for nfsd 2006-02-01 08:53:22 -08:00
proc-fns.h
processor.h
procinfo.h
ptrace.h
resource.h
scatterlist.h
sections.h
segment.h
semaphore-helper.h
semaphore.h [PATCH] semaphore: Remove __MUTEX_INITIALIZER() 2005-10-30 17:37:27 -08:00
sembuf.h
serial.h
setup.h
shmbuf.h
shmparam.h
sigcontext.h
siginfo.h
signal.h
sizes.h
smp.h
socket.h
sockios.h
spinlock.h
stat.h
statfs.h
string.h
suspend.h
sysirq.h
system.h [PATCH] arm26: drop first arg of prepare_arch_switch, finish_arch_switch 2006-02-01 08:53:22 -08:00
termbits.h
termios.h
thread_info.h [PATCH] fix arm26 THREAD_SIZE 2006-01-16 23:15:25 -08:00
timex.h
tlb.h
tlbflush.h
topology.h
types.h
uaccess-asm.h
uaccess.h
ucontext.h
unaligned.h
uncompress.h
unistd.h
user.h
xor.h