Andi Kleen 6a46079cf5 HWPOISON: The high level memory error handler in the VM v7 ... Add the high level memory handler that poisons pages that got corrupted by hardware (typically by a two bit flip in a DIMM or a cache) on the Linux level. The goal is to prevent everyone from accessing these pages in the future. This done at the VM level by marking a page hwpoisoned and doing the appropriate action based on the type of page it is. The code that does this is portable and lives in mm/memory-failure.c To quote the overview comment: High level machine check handler. Handles pages reported by the hardware as being corrupted usually due to a 2bit ECC memory or cache failure. This focuses on pages detected as corrupted in the background. When the current CPU tries to consume corruption the currently running process can just be killed directly instead. This implies that if the error cannot be handled for some reason it's safe to just ignore it because no corruption has been consumed yet. Instead when that happens another machine check will happen. Handles page cache pages in various states. The tricky part here is that we can access any page asynchronous to other VM users, because memory failures could happen anytime and anywhere, possibly violating some of their assumptions. This is why this code has to be extremely careful. Generally it tries to use normal locking rules, as in get the standard locks, even if that means the error handling takes potentially a long time. Some of the operations here are somewhat inefficient and have non linear algorithmic complexity, because the data structures have not been optimized for this case. This is in particular the case for the mapping from a vma to a process. Since this case is expected to be rare we hope we can get away with this. There are in principle two strategies to kill processes on poison: - just unmap the data and wait for an actual reference before killing - kill as soon as corruption is detected. Both have advantages and disadvantages and should be used in different situations. Right now both are implemented and can be switched with a new sysctl vm.memory_failure_early_kill The default is early kill. The patch does some rmap data structure walking on its own to collect processes to kill. This is unusual because normally all rmap data structure knowledge is in rmap.c only. I put it here for now to keep everything together and rmap knowledge has been seeping out anyways Includes contributions from Johannes Weiner, Chris Mason, Fengguang Wu, Nick Piggin (who did a lot of great work) and others. Cc: npiggin@suse.de Cc: riel@redhat.com Signed-off-by: Andi Kleen <ak@linux.intel.com> Acked-by: Rik van Riel <riel@redhat.com> Reviewed-by: Hidehiro Kawai <hidehiro.kawai.ez@hitachi.com>		2009-09-16 11:50:15 +02:00
..
ABI	block: Update topology documentation	2009-08-01 10:24:35 +02:00
accounting	Documentation/accounting/getdelays.c intialize the variable before using it	2009-06-16 19:47:51 -07:00
acpi	ACPI: update debug parameter documentation	2008-11-07 21:45:29 -05:00
aoe	aoe: user can ask driver to forget previously detected devices	2008-02-08 09:22:31 -08:00
arm	Nicolas Pitre has a new email address	2009-09-15 09:37:12 -07:00
auxdisplay	.gitignore updates	2008-10-30 11:38:45 -07:00
blackfin	Blackfin arch: Add document about bfin-gpio	2009-01-07 23:14:38 +08:00
block	Trivial typo fixes in Documentation/block/data-integrity.txt.	2009-07-01 10:56:25 +02:00
blockdev	mflash: initial support	2009-04-07 08:12:38 +02:00
cdrom	debugfs: Fix terminology inconsistency of dir name to mount debugfs filesystem.	2009-06-15 21:30:28 -07:00
cgroups	cpusets: document adding/removing cpus to cpuset elaborately	2009-06-30 18:56:01 -07:00
connector	Merge branch 'master' of master.kernel.org:/pub/scm/linux/kernel/git/davem/net-2.6	2009-07-23 19:03:51 -07:00
console
cpu-freq	[CPUFREQ] minor correction to cpu-freq documentation	2009-06-15 11:49:42 -04:00
cpuidle	cpuidle: Add Documentation	2008-02-14 00:16:13 -05:00
cris	fix random typos	2008-10-16 11:21:30 -07:00
crypto	async_tx, dmaengine: document channel allocation and api rework	2009-01-05 18:10:19 -07:00
development-process	docs: Encourage better changelogs in the development process document	2009-06-04 10:32:49 -06:00
device-mapper	dm raid1: add userspace log	2009-06-22 10:12:35 +01:00
DocBook	docbook: fix printk of ip address	2009-07-30 13:10:50 -07:00
driver-model	driver model: fix show/store prototypes in doc.	2009-07-12 13:02:10 -07:00
dvb	V4L/DVB (12206): get_dvb_firmware: Correct errors in MPC718 firmware extraction logic	2009-07-05 19:21:49 -03:00
early-userspace	Documentation: Remove last references to BitKeeper.	2008-04-21 22:19:05 +00:00
fault-injection	debugfs: Fix terminology inconsistency of dir name to mount debugfs filesystem.	2009-06-15 21:30:28 -07:00
fb	Documentation/fb/vesafb.txt: fix typo	2009-06-16 19:47:58 -07:00
filesystems	HWPOISON: Define a new error_remove_page address space op for async truncation	2009-09-16 11:50:13 +02:00
firmware_class	driver core: fix documentation of request_firmware_nowait	2009-06-15 21:30:24 -07:00
frv	move frv docs one level up	2008-02-03 15:54:28 +02:00
hwmon	hwmon: (f71882fg) Add support for the F71858F	2009-06-15 18:39:52 +02:00
i2c	i2c: Add a sysfs interface to instantiate devices	2009-06-19 16:58:20 +02:00
i2o
ia64	trivial: Fix misspelling of firmware	2009-03-30 15:21:59 +02:00
ide	ide: preserve Host Protected Area by default (v2)	2009-06-07 13:52:52 +02:00
infiniband	IPoIB: Document newish features	2009-04-08 13:52:01 -07:00
input	Input: add new driver for Sentelic Finger Sensing Pad	2009-08-19 21:46:09 -07:00
ioctl	Merge branch 'kvm-updates/2.6.32' of git://git.kernel.org/pub/scm/virt/kvm/kvm	2009-09-14 17:43:43 -07:00
isdn	isdn: clean up documentation index	2009-06-20 01:10:38 -07:00
ja_JP	block: rename CONFIG_LBD to CONFIG_LBDAF	2009-06-19 08:08:50 +02:00
kbuild	kconfig: resort the documentation of the environment variables	2009-06-09 22:37:47 +02:00
kdump	trivial: Miscellaneous documentation typo fixes	2009-06-12 18:01:47 +02:00
ko_KR
kvm	KVM: Document KVM_CAP_IRQCHIP	2009-09-10 10:46:55 +03:00
laptops	thinkpad-acpi: remove dock and bay subdrivers	2009-08-01 23:46:58 -04:00
lguest	lguest and virtio: cleanup struct definitions to Linux style.	2009-07-30 16:03:46 +09:30
m68k
make
mips	ide: remove unused CONFIG_BLK_DEV_IDE_AU1XXX_SEQTS_PER_RQ	2009-01-14 19:19:03 +01:00
misc-devices	drivers/misc/isl29003.c: driver for the ISL29003 ambient light sensor	2009-04-01 08:59:18 -07:00
mn10300	trivial: Miscellaneous documentation typo fixes	2009-06-12 18:01:47 +02:00
mtd	trivial: Miscellaneous documentation typo fixes	2009-06-12 18:01:47 +02:00
namespaces
netlabel
networking	sctp: Sysctl configuration for IPv4 Address Scoping	2009-09-04 18:21:01 -04:00
parisc
PCI	PCI AER: software error injection	2009-06-16 14:30:14 -07:00
pcmcia	.gitignore updates	2008-10-30 11:38:45 -07:00
power	PM: Introduce core framework for run-time PM of I/O devices (rev. 17)	2009-08-23 00:04:44 +02:00
powerpc	Merge branch 'for-linus' of git://git.o-hand.com/linux-rpurdie-leds	2009-06-28 11:02:32 -07:00
pps	LinuxPPS: core support	2009-06-18 13:04:04 -07:00
prctl	generic, x86: add tests for prctl PR_GET_TSC and PR_SET_TSC	2008-04-19 19:19:55 +02:00
RCU	rcu: Remove CONFIG_PREEMPT_RCU	2009-08-23 10:32:40 +02:00
s390	[S390] s390dbf: Add description for usage of "%s" in sprintf events	2009-09-11 10:29:53 +02:00
scheduler	sched: Documentation/sched-rt-group: Fix style issues & bump version	2009-06-21 13:12:46 +02:00
scsi	Merge git://git.kernel.org/pub/scm/linux/kernel/git/jejb/scsi-misc-2.6	2009-06-17 09:50:44 -07:00
serial	Create/use more directory structure in the Documentation/ tree.	2008-11-14 17:28:53 +00:00
sh	sh: Kill off remaining CONFIG_SH_KGDB bits.	2008-12-22 18:44:05 +09:00
sound	Merge branch 'topic/snd-printk' into for-linus	2009-09-10 15:33:03 +02:00
sparc	sparc: Remove Documentation/sparc/sbus_drivers.txt	2008-08-29 02:15:25 -07:00
spi	spi: new spi->mode bits	2009-06-30 18:56:00 -07:00
sysctl	HWPOISON: The high level memory error handler in the VM v7	2009-09-16 11:50:15 +02:00
telephony	remove mention of CONFIG_KMOD from documentation	2008-07-22 19:24:29 +10:00
thermal	thermal: update the documentation	2008-04-29 02:49:47 -04:00
timers	trivial: Miscellaneous documentation typo fixes	2009-06-12 18:01:47 +02:00
trace	tracing: Remove mentioning of legacy latency_trace file from documentation	2009-09-04 23:30:38 +02:00
uml
usb	trivial: usb: fix missing space typo in doc	2009-06-12 18:01:51 +02:00
video4linux	V4L/DVB (12720): em28xx-cards: Add vendor/product id for Kworld DVD Maker 2	2009-09-14 22:39:19 -03:00
vm	slub: add option to disable higher order debugging slabs	2009-07-10 09:52:55 +03:00
w1	w1: send status messages after command processing	2009-01-08 08:31:14 -08:00
watchdog	[WATCHDOG] hpwdt: Add NMI priority option	2009-06-23 07:13:45 +00:00
wimax	i2400m: documentation and instructions for usage	2009-01-07 10:00:18 -08:00
x86	x86, intel_txt: Intel TXT boot support	2009-07-21 11:49:06 -07:00
zh_CN
00-INDEX	Bluetooth: Add documentation for Marvell Bluetooth driver	2009-08-22 14:25:32 -07:00
applying-patches.txt
atomic_ops.txt	Documentation/atomic_ops.txt: fix sample code	2009-06-16 19:47:52 -07:00
bad_memory.txt	Document handling of bad memory	2008-12-03 16:09:53 -07:00
basic_profiling.txt
binfmt_misc.txt
braille-console.txt	trivial: Miscellaneous documentation typo fixes	2009-06-12 18:01:47 +02:00
bt8xxgpio.txt	gpio: add bt8xxgpio driver	2008-07-25 10:53:30 -07:00
btmrvl.txt	Bluetooth: Add documentation for Marvell Bluetooth driver	2009-08-22 14:25:32 -07:00
BUG-HUNTING	Documentation: add hint about call traces & module symbols to BUG-HUNTING	2008-02-06 10:41:09 -08:00
c2port.txt	Add c2 port support	2008-11-12 17:17:18 -08:00
cachetlb.txt
Changes	Documentation/Changes: perl is needed to build the kernel	2009-06-18 13:03:46 -07:00
CodingStyle	trivial: fix typo milisecond/millisecond for documentation and source comments.	2009-06-12 18:01:46 +02:00
cpu-hotplug.txt	x86: use possible_cpus=NUM to extend the possible cpus allowed	2008-12-18 12:08:05 +01:00
cpu-load.txt
cputopology.txt	cpumask: Use topology_core_cpumask()/topology_thread_cpumask()	2009-01-11 19:12:49 +01:00
credentials.txt	CRED: Documentation	2008-11-14 10:39:26 +11:00
dcdbas.txt
debugging-modules.txt	Documentation: Clarify when module debugging actually works.	2008-02-03 15:27:38 +02:00
debugging-via-ohci1394.txt	firewire: fw-ohci: add option for remote debugging	2008-04-18 17:55:33 +02:00
dell_rbu.txt	trivial: Documentation/dell_rbu.txt: fix typos	2009-06-12 18:01:50 +02:00
devices.txt	lanana: assign a device name and numbering for MAX3100	2009-04-07 08:44:05 -07:00
DMA-API.txt	trivial: Miscellaneous documentation typo fixes	2009-06-12 18:01:47 +02:00
DMA-attributes.txt	powerpc/cell: Add DMA_ATTR_WEAK_ORDERING dma attribute and use in Cell IOMMU code	2008-07-22 10:39:36 +10:00
DMA-ISA-LPC.txt
DMA-mapping.txt	dma-mapping: update the old macro DMA_nBIT_MASK related documentations	2009-04-07 08:31:12 -07:00
dmaengine.txt	async_tx, dmaengine: document channel allocation and api rework	2009-01-05 18:10:19 -07:00
dontdiff	dontdiff: Fix asm exclude	2009-03-26 15:45:43 -07:00
dynamic-debug-howto.txt	Dynamic debug: allow simple quoting of words	2009-03-24 16:38:27 -07:00
edac.txt	trivial: Miscellaneous documentation typo fixes	2009-06-12 18:01:47 +02:00
eisa.txt
email-clients.txt	Documentation/email-clients.txt: add some info about gmail	2008-11-06 15:41:19 -08:00
feature-removal-schedule.txt	Merge git://git.kernel.org/pub/scm/linux/kernel/git/davem/net-next-2.6	2009-09-14 10:37:28 -07:00
flexible-arrays.txt	Document the flex_array library.	2009-09-10 14:33:36 -06:00
futex-requeue-pi.txt	futex: add requeue-pi documentation	2009-05-09 07:12:50 +02:00
gcov.txt	gcov: fix documentation	2009-06-30 18:55:59 -07:00
gpio.txt	trivial: Miscellaneous documentation typo fixes	2009-06-12 18:01:47 +02:00
highuid.txt	[SPARC]: Remove SunOS and Solaris binary support.	2008-04-21 15:10:15 -07:00
HOWTO	Remove Andrew Morton's http://www.zip.com.au/~akpm/	2008-10-16 11:21:32 -07:00
hw_random.txt	hw_random doc updates	2008-03-24 19:22:19 -07:00
ics932s401	ics932s401: new clock generator chip driver	2008-11-12 17:17:18 -08:00
initrd.txt	use the newc archive format as requested by initramfs	2008-02-03 14:54:41 +02:00
Intel-IOMMU.txt	Documentation cleanup: trivial misspelling, punctuation, and grammar corrections.	2008-07-26 12:00:06 -07:00
intel_txt.txt	x86, intel_txt: Intel TXT boot support	2009-07-21 11:49:06 -07:00
io-mapping.txt	io mapping: improve documentation	2008-11-03 18:21:44 +01:00
IO-mapping.txt	Documentation: move DMA-mapping.txt to Doc/PCI/	2009-01-29 18:19:29 -08:00
io_ordering.txt
iostats.txt	Documentation cleanup: trivial misspelling, punctuation, and grammar corrections.	2008-07-26 12:00:06 -07:00
IPMI.txt
IRQ-affinity.txt	genirq: Expose default irq affinity mask (take 3)	2008-06-05 15:18:30 +02:00
IRQ.txt
irqflags-tracing.txt
isapnp.txt
java.txt
kernel-doc-nano-HOWTO.txt	kernel-doc: restrict syntax for private: and public:	2009-05-02 15:36:10 -07:00
kernel-docs.txt	doc: update to URL and status of kernel-docs.txt entry	2008-06-06 11:29:10 -07:00
kernel-parameters.txt	Merge branch 'for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/tj/percpu	2009-09-15 09:39:44 -07:00
keys-request-key.txt	keys: allow the callout data to be passed as a blob rather than a string	2008-04-29 08:06:16 -07:00
keys.txt	KEYS: Add a keyctl to install a process's session keyring on its parent [try #6]	2009-09-02 21:29:22 +10:00
kmemcheck.txt	kmemcheck: add the kmemcheck documentation	2009-06-13 14:27:20 +02:00
kmemleak.txt	kmemleak: add clear command support	2009-09-08 16:36:08 +01:00
kobject.txt	trivial: Miscellaneous documentation typo fixes	2009-06-12 18:01:47 +02:00
kprobes.txt	debugfs: Fix terminology inconsistency of dir name to mount debugfs filesystem.	2009-06-15 21:30:28 -07:00
kref.txt	docs: convert kref semaphore to mutex	2008-02-06 10:41:09 -08:00
ldm.txt
leds-class.txt	Documentation cleanup: trivial misspelling, punctuation, and grammar corrections.	2008-07-26 12:00:06 -07:00
leds-lp3944.txt	leds: LED driver for National Semiconductor LP3944 Funlight Chip	2009-06-23 20:21:38 +01:00
local_ops.txt	trivial: Miscellaneous documentation typo fixes	2009-06-12 18:01:47 +02:00
lockdep-design.txt	lockdep: Fix typos in documentation	2009-08-07 12:03:46 +02:00
lockstat.txt	lockstat: contend with points	2008-10-20 15:43:10 +02:00
logo.gif	Revert "linux.conf.au 2009: Tuz"	2009-04-27 12:00:27 -07:00
logo.txt	Revert "linux.conf.au 2009: Tuz"	2009-04-27 12:00:27 -07:00
magic-number.txt	documentation: update header file paths	2009-01-06 15:59:28 -08:00
Makefile	docsrc: build Documentation/ sources	2008-08-12 16:07:30 -07:00
ManagementStyle	docs: fix ManagementStyle book name	2008-10-30 11:38:46 -07:00
markers.txt	markers: comment marker_synchronize_unregister() on data dependency	2008-11-28 16:47:41 +01:00
mca.txt	The ps2esdi driver was marked as BROKEN more than two years ago due to being	2008-03-17 09:03:05 +01:00
md.txt	Documentation/md.txt update	2009-03-31 15:18:37 +11:00
memory-barriers.txt	sched: Document memory barriers implied by sleep/wake-up primitives	2009-04-29 14:15:55 +02:00
memory-hotplug.txt	trivial: Miscellaneous documentation typo fixes	2009-06-12 18:01:47 +02:00
memory.txt
mono.txt
mutex-design.txt
nmi_watchdog.txt	x86, nmi-watchdog: update procfs nmi_watchdog file documentation v2	2008-10-30 19:07:04 +01:00
nommu-mmap.txt	NOMMU: Make mmap allocation page trimming behaviour configurable.	2009-01-08 12:04:47 +00:00
numastat.txt
oops-tracing.txt	Taint kernel after WARN_ON(condition)	2008-04-29 08:05:59 -07:00
parport-lowlevel.txt
parport.txt
pi-futex.txt
pnp.txt
preempt-locking.txt
printk-formats.txt	DOC: add printk-formats.txt	2008-11-12 17:17:17 -08:00
prio_tree.txt
rbtree.txt	trivial: rbtree.txt: fix rb_entry() parameters in sample code	2009-06-12 18:01:47 +02:00
rfkill.txt	rfkill: export persistent attribute in sysfs	2009-06-19 11:50:18 -04:00
robust-futex-ABI.txt	futex: documentation: fix inconsistent description of futex list_op_pending	2009-06-18 13:03:56 -07:00
robust-futexes.txt
rt-mutex-design.txt
rt-mutex.txt
rtc.txt	rtc: cleanup example code	2008-02-06 10:41:14 -08:00
SAK.txt	Remove Andrew Morton's old email accounts	2008-10-16 11:21:32 -07:00
SecurityBugs
SELinux.txt	selinux: add support for installing a dummy policy (v2)	2008-08-27 08:54:08 +10:00
serial-console.txt
sgi-ioc4.txt
sgi-visws.txt
slow-work.txt	Document the slow work thread pool	2009-04-03 16:42:35 +01:00
SM501.txt	trivial: Miscellaneous documentation typo fixes	2009-06-12 18:01:47 +02:00
Smack.txt	smack: implement logging V3	2009-04-14 09:00:23 +10:00
sparse.txt	Documentation: explain the difference between __bitwise and __bitwise__	2009-04-11 08:18:11 +02:00
spinlocks.txt	Add additional examples in Documentation/spinlocks.txt	2008-04-11 13:21:14 -06:00
stable_api_nonsense.txt
stable_kernel_rules.txt	Update stable tree documentation	2008-10-29 15:03:49 -07:00
SubmitChecklist	block: rename CONFIG_LBD to CONFIG_LBDAF	2009-06-19 08:08:50 +02:00
SubmittingDrivers	Remove Andrew Morton's old email accounts	2008-10-16 11:21:32 -07:00
SubmittingPatches	Merge branch 'for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/jikos/trivial	2009-06-14 13:46:25 -07:00
svga.txt
sysfs-rules.txt	Doc/sysfs-rules: Swap the order of the words so the sentence makes more sense	2009-05-08 19:22:20 -07:00
sysrq.txt	sysrq, kdump: make sysrq-c consistent	2009-07-29 19:10:36 -07:00
tomoyo.txt	tomoyo: add Documentation/tomoyo.txt	2009-04-14 09:14:58 +10:00
unaligned-memory-access.txt	introduce HAVE_EFFICIENT_UNALIGNED_ACCESS Kconfig symbol	2008-07-25 10:53:27 -07:00
unicode.txt
unshare.txt
VGA-softcursor.txt
video-output.txt
volatile-considered-harmful.txt	Documentation cleanup: trivial misspelling, punctuation, and grammar corrections.	2008-07-26 12:00:06 -07:00
voyager.txt
zorro.txt