Stanislaw Gruszka c0a32fc5a2 mm: more intensive memory corruption debugging ... With CONFIG_DEBUG_PAGEALLOC configured, the CPU will generate an exception on access (read,write) to an unallocated page, which permits us to catch code which corrupts memory. However the kernel is trying to maximise memory usage, hence there are usually few free pages in the system and buggy code usually corrupts some crucial data. This patch changes the buddy allocator to keep more free/protected pages and to interlace free/protected and allocated pages to increase the probability of catching corruption. When the kernel is compiled with CONFIG_DEBUG_PAGEALLOC, debug_guardpage_minorder defines the minimum order used by the page allocator to grant a request. The requested size will be returned with the remaining pages used as guard pages. The default value of debug_guardpage_minorder is zero: no change from current behaviour. [akpm@linux-foundation.org: tweak documentation, s/flg/flag/] Signed-off-by: Stanislaw Gruszka <sgruszka@redhat.com> Cc: Mel Gorman <mgorman@suse.de> Cc: Andrea Arcangeli <aarcange@redhat.com> Cc: "Rafael J. Wysocki" <rjw@sisk.pl> Cc: Christoph Lameter <cl@linux-foundation.org> Cc: Pekka Enberg <penberg@cs.helsinki.fi> Signed-off-by: Andrew Morton <akpm@linux-foundation.org> Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>		2012-01-10 16:30:42 -08:00
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ABI	Merge branch 'usb-next' of git://git.kernel.org/pub/scm/linux/kernel/git/gregkh/usb	2012-01-09 12:09:47 -08:00
DocBook	Merge branch 'core-debugobjects-for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/tip/tip	2012-01-06 07:53:34 -08:00
PCI	…
RCU	docs: Additional LWN links to RCU API	2011-12-11 10:32:23 -08:00
accounting	…
acpi	…
aoe	…
arm	ARM: move iotable mappings within the vmalloc region	2011-11-26 19:21:26 -05:00
auxdisplay	…
blackfin	…
block	…
blockdev	…
cdrom	…
cgroups	Merge branch 'for-3.3' of git://git.kernel.org/pub/scm/linux/kernel/git/tj/cgroup	2012-01-09 12:59:24 -08:00
connector	…
console	…
cpu-freq	…
cpuidle	…
cris	…
crypto	…
development-process	Documentation: Update stable address	2011-12-12 14:14:31 -08:00
device-mapper	…
devicetree	power management changes for omap and imx	2012-01-09 14:39:59 -08:00
driver-model	…
dvb	…
early-userspace	…
fault-injection	…
fb	…
filesystems	Merge branch 'for-linus2' of git://git.kernel.org/pub/scm/linux/kernel/git/viro/vfs	2012-01-08 12:19:57 -08:00
firmware_class	…
frv	…
hid	…
hwmon	hwmon: (pmbus/zl6100) Add support for Ericsson BMR45[0,1] and BMR46[2,3,4]	2012-01-05 08:19:28 -08:00
i2c	i2c: Fix device name for 10-bit slave address	2011-11-23 11:33:07 +01:00
i2o	…
ia64	…
ide	…
infiniband	…
input	…
ioctl	…
isdn	…
ja_JP	…
kbuild	…
kdump	[S390] Add s390x description to Documentation/kdump/kdump.txt	2011-12-27 11:27:13 +01:00
ko_KR	…
laptops	…
leds	…
m68k	…
make	…
mips	…
misc-devices	…
mmc	…
mn10300	…
mtd	…
namespaces	…
netlabel	…
networking	bonding: document undocumented active_slave sysfs entry.	2011-12-26 20:09:35 -05:00
nfc	…
parisc	…
pcmcia	…
power	PM: Run the driver callback directly if the subsystem one is not there	2011-12-21 22:01:05 +01:00
powerpc	…
pps	…
prctl	…
pti	…
ptp	…
rapidio	…
s390	[S390] Remove Kerntypes leftovers	2011-12-27 11:27:12 +01:00
scheduler	…
scsi	…
security	…
serial	serial/documentation: fix documented name of DCD cpp symbol	2012-01-04 16:26:32 -08:00
sh	…
sound	Merge branch 'fix/asoc' into for-linus	2011-12-06 13:22:28 +01:00
sparc	…
spi	…
sysctl	…
target	…
telephony	…
thermal	…
timers	…
trace	mm-tracepoint: fix documentation and examples	2012-01-10 16:30:41 -08:00
usb	USB: update documentation for usbmon	2012-01-04 16:04:30 -08:00
vDSO	…
video4linux	…
virtual	KVM: Don't automatically expose the TSC deadline timer in cpuid	2011-12-26 13:27:44 +02:00
vm	…
w1	…
watchdog	…
wimax	…
x86	…
zh_CN	…
.gitignore	…
00-INDEX	…
BUG-HUNTING	…
Changes	…
CodingStyle	…
DMA-API-HOWTO.txt	…
DMA-API.txt	…
DMA-ISA-LPC.txt	…
DMA-attributes.txt	…
HOWTO	Documentation: Update stable address	2011-12-12 14:14:31 -08:00
IPMI.txt	…
IRQ-affinity.txt	…
IRQ.txt	…
Intel-IOMMU.txt	…
Makefile	…
ManagementStyle	…
SAK.txt	…
SM501.txt	…
SecurityBugs	…
SubmitChecklist	…
SubmittingDrivers	…
SubmittingPatches	…
VGA-softcursor.txt	…
applying-patches.txt	…
atomic_ops.txt	doc: Add load/store guarantees to Documentation/atomic-ops.txt	2011-12-11 10:31:58 -08:00
bad_memory.txt	…
basic_profiling.txt	…
binfmt_misc.txt	…
braille-console.txt	…
bt8xxgpio.txt	…
btmrvl.txt	…
bus-virt-phys-mapping.txt	…
cachetlb.txt	…
circular-buffers.txt	…
coccinelle.txt	…
cpu-hotplug.txt	…
cpu-load.txt	…
cputopology.txt	…
dcdbas.txt	…
debugging-modules.txt	…
debugging-via-ohci1394.txt	…
dell_rbu.txt	…
devices.txt	devices.txt: Fix typo of 'VMware'.	2011-12-09 11:21:32 +01:00
dma-buf-sharing.txt	dma-buf: Documentation for buffer sharing framework	2012-01-06 10:20:24 +00:00
dmaengine.txt	…
dontdiff	[S390] Remove Kerntypes leftovers	2011-12-27 11:27:12 +01:00
dynamic-debug-howto.txt	…
edac.txt	…
eisa.txt	…
email-clients.txt	…
feature-removal-schedule.txt	Merge branch 'usb-next' of git://git.kernel.org/pub/scm/linux/kernel/git/gregkh/usb	2012-01-09 12:09:47 -08:00
flexible-arrays.txt	…
futex-requeue-pi.txt	…
gcov.txt	…
gpio.txt	…
highuid.txt	…
hw_random.txt	…
hwspinlock.txt	…
init.txt	…
initrd.txt	…
intel_txt.txt	…
io-mapping.txt	…
io_ordering.txt	…
iostats.txt	…
irqflags-tracing.txt	…
isapnp.txt	…
java.txt	…
kernel-doc-nano-HOWTO.txt	…
kernel-docs.txt	…
kernel-parameters.txt	mm: more intensive memory corruption debugging	2012-01-10 16:30:42 -08:00
kmemcheck.txt	…
kmemleak.txt	…
kobject.txt	…
kprobes.txt	…
kref.txt	…
ldm.txt	…
local_ops.txt	…
lockdep-design.txt	lockdep: Update documentation for lock-class leak detection	2011-12-11 10:31:23 -08:00
lockstat.txt	…
logo.gif	…
logo.txt	…
magic-number.txt	…
mca.txt	…
md.txt	md: create externally visible flags for supporting hot-replace.	2011-12-23 10:17:51 +11:00
media-framework.txt	…
memory-barriers.txt	…
memory-hotplug.txt	…
memory.txt	…
mono.txt	…
mutex-design.txt	…
nmi_watchdog.txt	…
nommu-mmap.txt	…
numastat.txt	…
oops-tracing.txt	…
padata.txt	…
parport-lowlevel.txt	…
parport.txt	…
pi-futex.txt	…
pinctrl.txt	…
pnp.txt	…
preempt-locking.txt	…
printk-formats.txt	…
prio_tree.txt	…
ramoops.txt	…
rbtree.txt	…
rfkill.txt	…
robust-futex-ABI.txt	…
robust-futexes.txt	…
rt-mutex-design.txt	…
rt-mutex.txt	…
rtc.txt	…
serial-console.txt	…
sgi-ioc4.txt	…
sgi-visws.txt	…
sparse.txt	…
spinlocks.txt	…
stable_api_nonsense.txt	…
stable_kernel_rules.txt	…
svga.txt	…
sysfs-rules.txt	…
sysrq.txt	…
unaligned-memory-access.txt	…
unicode.txt	…
unshare.txt	…
vgaarbiter.txt	misc latin1 to utf8 conversions	2012-01-02 13:04:55 +01:00
video-output.txt	…
volatile-considered-harmful.txt	…
workqueue.txt	…
xz.txt	…
zorro.txt	…