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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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mach-bigsmp	[PATCH] x86: convert bigsmp to use flat physical mode	19 years ago
mach-default	[PATCH] x86_64/i386: Remove preempt disable calls in lowlevel IPI	19 years ago
mach-es7000	[PATCH] ES7000 platform update	19 years ago
mach-generic	…
mach-numaq	…
mach-summit	[PATCH] USB: Always do usb-handoff	19 years ago
mach-visws	Revert "i386: move apic init in init_IRQs"	19 years ago
mach-voyager	…
8253pit.h	…
a.out.h	…
acpi.h	[ACPI] Avoid BIOS inflicted crashes by evaluating _PDC only once	19 years ago
agp.h	…
apic.h	[PATCH] i386: Handle missing local APIC timer interrupts on C3 state	19 years ago
apicdef.h	…
arch_hooks.h	…
atomic.h	[PATCH] EDAC: core EDAC support code	19 years ago
auxvec.h	…
bitops.h	[PATCH] mark several functions __always_inline	19 years ago
boot.h	…
bug.h	…
bugs.h	[PATCH] i386: move SIMD initialization	19 years ago
byteorder.h	…
cache.h	[PATCH] Kill L1_CACHE_SHIFT_MAX	19 years ago
cacheflush.h	[PATCH] x86/x86_64: mark rodata section read only: x86 parts	19 years ago
checksum.h	…
cpu.h	…
cpufeature.h	[PATCH] i386/x86-64: Generalize X86_FEATURE_CONSTANT_TSC flag	19 years ago
cputime.h	…
current.h	[PATCH] mark several functions __always_inline	19 years ago
debugreg.h	…
delay.h	…
desc.h	[PATCH] x86: GDT alignment fix	19 years ago
div64.h	…
dma-mapping.h	[PATCH] i386: make pci_map_single/pci_map_sg warn for zero length.	19 years ago
dma.h	…
e820.h	…
edac.h	[PATCH] EDAC: core EDAC support code	19 years ago
elf.h	[PATCH] fix remaining missing includes	19 years ago
emergency-restart.h	…
errno.h	…
fcntl.h	…
fixmap.h	…
floppy.h	…
futex.h	[PATCH] uml: remove leftover from patch revertal	19 years ago
genapic.h	…
hardirq.h	…
highmem.h	…
hpet.h	…
hw_irq.h	Revert "i386: move apic init in init_IRQs"	19 years ago
i387.h	[PATCH] i386: task_thread_info()	19 years ago
i8253.h	…
i8259.h	…
ide.h	[PATCH] ide: explain the PCI bus test we do in <asm-i386/ide.h>	19 years ago
io.h	[PATCH] x86_64: Generalize DMI and enable for x86-64	19 years ago
io_apic.h	…
ioctl.h	[PATCH] Generic ioctl.h	19 years ago
ioctls.h	…
ipc.h	…
ipcbuf.h	…
irq.h	[PATCH] Make vm86 support optional	19 years ago
ist.h	…
kdebug.h	…
kexec.h	[PATCH] Kdump: i386 compiler warning fix	19 years ago
kmap_types.h	…
kprobes.h	[PATCH] kprobes: fix build breakage	19 years ago
ldt.h	…
linkage.h	…
local.h	…
math_emu.h	…
mc146818rtc.h	…
mca.h	…
mca_dma.h	…
mman.h	[PATCH] madvise MADV_DONTFORK/MADV_DOFORK	19 years ago
mmu.h	…
mmu_context.h	…
mmx.h	…
mmzone.h	[PATCH] mm: kvaddr_to_nid not used in common code	19 years ago
module.h	[PATCH] Base support for AMD Geode GX/LX processors	19 years ago
mpspec.h	…
mpspec_def.h	[PATCH] mpspec: remove unneeded packed attribute	19 years ago
msgbuf.h	…
msi.h	[PATCH] PCI: Change MSI to use physical delivery mode always	19 years ago
msr.h	…
mtrr.h	…
mutex.h	Fix mutex_trylock() copy-and-paste bug (x86, x86-64, generic mutex-dec.h)	19 years ago
namei.h	…
nmi.h	…
node.h	…
numa.h	…
numaq.h	…
numnodes.h	…
page.h	[PATCH] VMSPLIT config options	19 years ago
param.h	[PATCH] Avoid namespace pollution in <asm/param.h>	19 years ago
parport.h	…
pci-direct.h	…
pci.h	…
percpu.h	…
pgalloc.h	…
pgtable-2level-defs.h	…
pgtable-2level.h	[PATCH] i386: little pgtable.h consolidation vs 2/3level	19 years ago
pgtable-3level-defs.h	…
pgtable-3level.h	[PATCH] i386: little pgtable.h consolidation vs 2/3level	19 years ago
pgtable.h	[PATCH] fix remaining missing includes	19 years ago
poll.h	…
posix_types.h	…
processor.h	[PATCH] i386: task_stack_page()	19 years ago
ptrace.h	[PATCH] PTRACE_SYSEMU is only for i386 and clashes with other ptrace codes of other archs	19 years ago
resource.h	…
rtc.h	…
rwlock.h	…
rwsem.h	[PATCH] add sem_is_read/write_locked()	19 years ago
scatterlist.h	…
seccomp.h	…
sections.h	…
segment.h	[PATCH] x86: Pnp segments in segment h	19 years ago
semaphore.h	[PATCH] semaphore: Remove __MUTEX_INITIALIZER()	19 years ago
sembuf.h	…
serial.h	…
setup.h	…
shmbuf.h	…
shmparam.h	…
sigcontext.h	…
siginfo.h	…
signal.h	[PATCH] Handle TIF_RESTORE_SIGMASK for i386	19 years ago
smp.h	[PATCH] PCI: Change MSI to use physical delivery mode always	19 years ago
socket.h	…
sockios.h	…
sparsemem.h	…
spinlock.h	…
spinlock_types.h	…
srat.h	…
stat.h	…
statfs.h	…
string.h	[PATCH] mark several functions __always_inline	19 years ago
suspend.h	…
system.h	[PATCH] Fix "value computed is not used" compile warnings with gcc-4.1	19 years ago
termbits.h	…
termios.h	…
thread_info.h	[PATCH] Handle TIF_RESTORE_SIGMASK for i386	19 years ago
timer.h	…
timex.h	…
tlb.h	…
tlbflush.h	…
topology.h	[PATCH] fix x86 topology export in sysfs for subarchitectures	19 years ago
types.h	…
uaccess.h	[PATCH] mark several functions __always_inline	19 years ago
ucontext.h	…
unaligned.h	…
unistd.h	[PATCH] fstatat64 support	19 years ago
user.h	…
vga.h	…
vic.h	…
vm86.h	[PATCH] Make vm86 support optional	19 years ago
voyager.h	…
xor.h	…