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
apc.h
asi.h
asmmacro.h
atomic.h	[PATCH] mutex subsystem, add atomic_xchg() to all arches	2006-01-09 15:59:17 -08:00
auxio.h
auxvec.h	[PATCH] auxiliary vector cleanups	2005-09-07 16:57:21 -07:00
bitext.h
bitops.h	[FLS64]: generic version	2006-01-03 13:11:06 -08:00
bpp.h
bsderrno.h
btfixup.h	[PATCH] fix the breakage in sparc headers	2005-10-05 07:33:42 -07:00
bug.h	[PATCH] remove all kernel BUGs	2005-05-01 08:59:01 -07:00
bugs.h
byteorder.h
cache.h	[PATCH] Kill L1_CACHE_SHIFT_MAX	2006-01-08 20:13:39 -08:00
cacheflush.h
checksum.h
clock.h
contregs.h
cpudata.h
cputime.h
current.h
cypress.h	[SPARC]: "extern inline" doesn't make much sense.	2005-10-03 17:37:02 -07:00
delay.h	[SPARC]: "extern inline" doesn't make much sense.	2005-10-03 17:37:02 -07:00
div64.h
dma-mapping.h	[PATCH] gfp_t: dma-mapping (simple cases)	2005-10-28 08:16:49 -07:00
dma.h	[SPARC]: "extern inline" doesn't make much sense.	2005-10-03 17:37:02 -07:00
ebus.h
ecc.h
eeprom.h
elf.h
emergency-restart.h	[PATCH] Add emergency_restart()	2005-07-26 14:35:41 -07:00
errno.h	[PATCH] add EOWNERDEAD and ENOTRECOVERABLE version 2	2005-05-01 08:59:06 -07:00
fbio.h
fcntl.h	[PATCH] Clean up struct flock64 definitions	2005-09-07 16:57:38 -07:00
fixmap.h
floppy.h	[PATCH] remove some more check_region stuff	2005-10-30 17:37:18 -08:00
futex.h	[PATCH] consolidate asm/futex.h	2006-01-08 20:13:39 -08:00
hardirq.h
head.h
highmem.h
hw_irq.h
ide.h
idprom.h
io-unit.h
io.h
ioctl.h
ioctls.h
iommu.h	[SPARC]: "extern inline" doesn't make much sense.	2005-10-03 17:37:02 -07:00
ipc.h
ipcbuf.h
irq.h
jsflash.h
kdebug.h	[SPARC]: "extern inline" doesn't make much sense.	2005-10-03 17:37:02 -07:00
kgdb.h
kmap_types.h
linkage.h
local.h
machines.h
mbus.h	[SPARC]: "extern inline" doesn't make much sense.	2005-10-03 17:37:02 -07:00
mc146818rtc.h
memreg.h	[PATCH] sun4c_memerr_reg __iomem annotations	2005-12-15 10:01:29 -08:00
mman.h	[PATCH] madvise MADV_DONTFORK/MADV_DOFORK	2006-02-14 16:09:34 -08:00
mmu_context.h
mmu.h
module.h
mostek.h
mpmbox.h
msgbuf.h
msi.h	[SPARC]: "extern inline" doesn't make much sense.	2005-10-03 17:37:02 -07:00
mutex.h	[PATCH] mutex subsystem, add default include/asm-*/mutex.h files	2006-01-09 15:59:19 -08:00
mxcc.h	[SPARC]: "extern inline" doesn't make much sense.	2005-10-03 17:37:02 -07:00
namei.h
obio.h	[SPARC]: "extern inline" doesn't make much sense.	2005-10-03 17:37:02 -07:00
openprom.h
openpromio.h
oplib.h	[SPARC]: sparc32 needs PROMDEV_{I,O}RSC defines too.	2006-01-18 21:57:37 -08:00
page.h	[PATCH] mm: consolidate get_order	2005-09-05 00:05:39 -07:00
param.h
pbm.h
pci.h	[SPARC]: "extern inline" doesn't make much sense.	2005-10-03 17:37:02 -07:00
pcic.h	[PATCH] fix iomem annotations in sparc32 pcic code	2005-12-15 10:01:28 -08:00
pconf.h
percpu.h
perfctr.h
pgalloc.h
pgtable.h	[PATCH] vm: remove unused/broken page_pte[_prot] macros	2005-10-30 17:37:22 -08:00
pgtsrmmu.h	[SPARC]: "extern inline" doesn't make much sense.	2005-10-03 17:37:02 -07:00
pgtsun4.h
pgtsun4c.h
poll.h
posix_types.h
processor.h	[SPARC]: "extern inline" doesn't make much sense.	2005-10-03 17:37:02 -07:00
psr.h	[SPARC]: "extern inline" doesn't make much sense.	2005-10-03 17:37:02 -07:00
ptrace.h	[PATCH] consolidate sys_ptrace()	2005-11-07 07:53:42 -08:00
reg.h
resource.h
ross.h
rtc.h
sbi.h	[SPARC]: "extern inline" doesn't make much sense.	2005-10-03 17:37:02 -07:00
sbus.h	[SPARC]: "extern inline" doesn't make much sense.	2005-10-03 17:37:02 -07:00
scatterlist.h
sections.h
semaphore.h	[PATCH] semaphore: Remove __MUTEX_INITIALIZER()	2005-10-30 17:37:27 -08:00
sembuf.h
setup.h
sfp-machine.h
shmbuf.h
shmparam.h
sigcontext.h
siginfo.h
signal.h	[PATCH] asm/signal.h unification	2005-05-04 07:33:15 -07:00
smp.h	[SPARC]: "extern inline" doesn't make much sense.	2005-10-03 17:37:02 -07:00
smpprim.h	[SPARC]: "extern inline" doesn't make much sense.	2005-10-03 17:37:02 -07:00
socket.h	[NET]: Introduce SO_{SND,RCV}BUFFORCE socket options	2005-08-29 15:31:35 -07:00
sockios.h
solerrno.h
spinlock_types.h	[PATCH] spinlock consolidation	2005-09-10 10:06:21 -07:00
spinlock.h	[SPARC]: "extern inline" doesn't make much sense.	2005-10-03 17:37:02 -07:00
stat.h
statfs.h
string.h
sun4paddr.h
sun4prom.h
sunbpp.h
svr4.h
swift.h
sysen.h
system.h	[PATCH] sparc: task_thread_info()	2006-01-12 09:08:53 -08:00
termbits.h
termios.h	[SPARC]: remove duplicate TIOCPKT_ definitions	2005-11-07 14:10:42 -08:00
thread_info.h	[SPARC]: Add support for *at(), ppoll, and pselect syscalls.	2006-01-19 02:42:49 -08:00
timer.h
timex.h
tlb.h
tlbflush.h
topology.h
traps.h	[SPARC]: "extern inline" doesn't make much sense.	2005-10-03 17:37:02 -07:00
tsunami.h
turbosparc.h
types.h	[PATCH] sab: consolidate kmem_bufctl_t	2005-09-05 00:05:48 -07:00
uaccess.h	[PATCH] remove verify_area(): remove verify_area() from various uaccess.h headers	2005-09-07 16:57:35 -07:00
unaligned.h
unistd.h	[SPARC]: sys_newfstatat --> sys_fstatat64	2006-02-12 23:30:11 -08:00
user.h
vac-ops.h
vaddrs.h
vfc_ioctls.h
viking.h
winmacro.h
xor.h