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Dmitry Vyukov a2e5144538 kernel/hung_task.c: allow to set checking interval separately from timeout 
Currently task hung checking interval is equal to timeout, as the result
hung is detected anywhere between timeout and 2*timeout.  This is fine for
most interactive environments, but this hurts automated testing setups
(syzbot).  In an automated setup we need to strictly order CPU lockup <
RCU stall < workqueue lockup < task hung < silent loss, so that RCU stall
is not detected as task hung and task hung is not detected as silent
machine loss.  The large variance in task hung detection timeout requires
setting silent machine loss timeout to a very large value (e.g.  if task
hung is 3 mins, then silent loss need to be set to ~7 mins).  The
additional 3 minutes significantly reduce testing efficiency because
usually we crash kernel within a minute, and this can add hours to bug
localization process as it needs to do dozens of tests.

Allow setting checking interval separately from timeout.  This allows to
set timeout to, say, 3 minutes, but checking interval to 10 secs.

The interval is controlled via a new hung_task_check_interval_secs sysctl,
similar to the existing hung_task_timeout_secs sysctl.  The default value
of 0 results in the current behavior: checking interval is equal to
timeout.

[akpm@linux-foundation.org: update hung_task_timeout_max's comment]
Link: http://lkml.kernel.org/r/20180611111004.203513-1-dvyukov@google.com
Signed-off-by: Dmitry Vyukov <dvyukov@google.com>
Cc: Paul E. McKenney <paulmck@linux.vnet.ibm.com>
Cc: Tetsuo Handa <penguin-kernel@I-love.SAKURA.ne.jp>
Cc: Thomas Gleixner <tglx@linutronix.de>
Cc: Peter Zijlstra <a.p.zijlstra@chello.nl>
Cc: Ingo Molnar <mingo@elte.hu>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
 		2018-08-22 10:52:47 -07:00
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ABI Char/Misc driver patches for 4.19-rc1 2018-08-18 11:04:51 -07:00
EDID
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PCI Merge branch 'remotes/lorenzo/pci/dwc' 2018-08-15 14:59:11 -05:00
RCU rculist: Improve documentation for list_for_each_entry_from_rcu() 2018-07-12 15:39:25 -07:00
accelerators ocxl: Document new OCXL IOCTLs 2018-06-03 20:40:33 +10:00
accounting
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acpi ACPI: property: graph: Update graph documentation to use generic references 2018-07-23 12:44:52 +02:00
admin-guide mm, oom: introduce memory.oom.group 2018-08-22 10:52:45 -07:00
aoe
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arm ARM: Device-tree updates 2018-06-11 17:57:38 -07:00
arm64 ARM: 2018-04-09 11:42:31 -07:00
auxdisplay Doc: misc-devices: move lcd-panel-cgram.txt to auxdisplay/ 2018-04-12 16:08:02 +02:00
backlight
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block block: Track DISCARD statistics and output them in stat and diskstat 2018-07-18 08:44:22 -06:00
blockdev zram: introduce zram memory tracking 2018-06-07 17:34:34 -07:00
bpf Merge git://git.kernel.org/pub/scm/linux/kernel/git/bpf/bpf-next 2018-08-07 11:02:05 -07:00
bus-devices
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cdrom Documentation/cdrom: fix German sharp s in LaTex 2018-03-08 19:35:29 -07:00
cgroup-v1 page cache: use xa_lock 2018-04-11 10:28:39 -07:00
cma
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connector
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console Documentation: corrections to console/console.txt 2018-08-10 16:09:40 -06:00
core-api This was a moderately busy cycle for docs, with the usual collection of 2018-08-14 14:29:31 -07:00
cpu-freq cpufreq: Drop cpufreq_table_validate_and_show() 2018-04-10 08:40:45 +02:00
cpuidle cpuidle: Add definition of residency to sysfs documentation 2018-04-09 13:44:37 +02:00
crypto crypto: remove redundant type flags from tfm allocation 2018-07-09 00:30:29 +08:00
dev-tools doc: dev-tools: kselftest.rst: update contributing new tests 2018-06-29 09:01:50 -06:00
device-mapper dm thin: include metadata_low_watermark threshold in pool status 2018-07-30 11:49:08 -04:00
devicetree RTC for 4.19 2018-08-20 16:30:27 -07:00
doc-guide Documentation/sphinx: allow "functions" with no parameters 2018-06-30 07:52:42 -06:00
driver-api Driver core patches for 4.19-rc1 2018-08-18 11:44:53 -07:00
driver-model dmaengine: add a new helper dmaenginem_async_device_register 2018-07-30 10:50:22 +05:30
early-userspace
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extcon
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fault-injection Documentation: nvme: Documentation for nvme fault injection 2018-03-26 08:53:43 -06:00
fb console/fbcon: Add support for deferred console takeover 2018-06-28 15:20:30 +02:00
features ARM: 8777/1: Hook up SYNC_CORE functionality for sys_membarrier() 2018-07-11 11:02:08 +01:00
filesystems /proc/meminfo: add percpu populated pages count 2018-08-22 10:52:45 -07:00
firmware_class
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fmc
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fpga docs: fpga: add a document for FPGA Device Feature List (DFL) Framework Overview 2018-07-15 13:55:44 +02:00
gpio Documentation: gpio: Move drivers-on-gpio.txt to driver-api 2018-03-23 04:22:29 +01:00
gpu drm/msm/gpu: Add the buffer objects from the submit to the crash dump 2018-07-30 08:50:10 -04:00
hid
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hwmon powerpc updates for 4.19 2018-08-17 11:32:50 -07:00
i2c Merge branch 'i2c/for-4.18' of git://git.kernel.org/pub/scm/linux/kernel/git/wsa/linux 2018-06-14 16:21:46 +09:00
ia64 ia64: doc: tweak whitespace for 'console=' parameter 2018-03-05 14:41:38 -08:00
ide
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iio
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infiniband Documentation/ABI: update infiniband sysfs interfaces 2018-02-23 08:18:33 -07:00
input input: add MT_TOOL_DIAL 2018-07-17 15:33:47 +02:00
ioctl Char/Misc driver patches for 4.19-rc1 2018-08-18 11:04:51 -07:00
isdn Documentation/isdn: check and fix dead links ... 2018-03-26 12:31:13 -04:00
kbuild Kconfig updates for v4.19 2018-08-15 12:50:10 -07:00
kdump
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kernel-hacking doc:it_IT: translation for kernel-hacking 2018-07-26 16:21:09 -06:00
laptops platform/x86: thinkpad_acpi: silence HKEY 0x6032, 0x60f0, 0x6030 2018-05-07 15:10:31 +03:00
leds
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lightnvm
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livepatch livepatch: Remove not longer valid limitations from the documentation 2018-05-24 15:37:57 +02:00
locking locking: Implement an algorithm choice for Wound-Wait mutexes 2018-07-03 09:44:36 +02:00
m68k
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maintainer docs: Fix more broken references 2018-06-15 18:11:26 -03:00
md raid5-ppl: PPL support for disks with write-back cache enabled 2018-01-15 14:29:42 -08:00
media media: doc: media/v4l-drivers: Update Qualcomm CAMSS driver document for 8x96 2018-08-02 08:48:00 -04:00
memory-devices
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mic
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mips Documentation: mips: Update AU1xxx_IDE Kconfig dependencies 2018-02-01 12:45:35 -07:00
misc-devices pci_endpoint_test: Add 2 ioctl commands 2018-07-19 11:46:57 +01:00
mmc
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mtd mtd: spi-nor: add an API to restore the status of SPI flash chip 2017-12-13 00:36:00 +01:00
namespaces
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netlabel
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networking Merge git://git.kernel.org/pub/scm/linux/kernel/git/pablo/nf 2018-08-18 09:59:19 -07:00
nfc
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nios2
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nvdimm
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nvmem
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openrisc
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parisc
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pcmcia pcmcia: remove long deprecated pcmcia_request_exclusive_irq() function 2018-08-18 12:30:42 -07:00
perf drivers/bus: Move Arm CCN PMU driver 2018-03-06 17:26:15 +01:00
phy
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platform
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power PM / reboot: Eliminate race between reboot and suspend 2018-08-06 12:35:20 +02:00
powerpc powerpc: Document issues with TM on POWER9 2018-07-02 23:54:29 +10:00
pps
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process Raise the minimum required gcc version to 4.6 2018-08-20 14:12:38 -07:00
pti
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ptp ptp: Fix documentation to match code. 2018-03-26 12:13:21 -04:00
rapidio Documentation: rapidio: move sysfs interface to ABI 2018-02-23 08:25:45 -07:00
riscv perf: riscv: Add Document for Future Porting Guide 2018-06-04 14:02:11 -07:00
s390 vfio-ccw: update documentation 2018-03-01 17:32:14 +01:00
scheduler sched/deadline/Documentation: Add overrun signal and GRUB-PA documentation 2018-05-14 09:12:27 +02:00
scsi block: remove BLK_EH_HANDLED 2018-05-29 08:59:21 -06:00
security Kbuild: rename CC_STACKPROTECTOR[_STRONG] config variables 2018-06-14 12:21:18 +09:00
serial
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sh
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sound ASoC: Updates for v4.19 2018-08-13 12:12:31 +02:00
sparc sparc64: Add support for ADI (Application Data Integrity) 2018-03-18 07:38:48 -07:00
sphinx Documentation/sphinx: allow "functions" with no parameters 2018-06-30 07:52:42 -06:00
sphinx-static
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spi
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sysctl kernel/hung_task.c: allow to set checking interval separately from timeout 2018-08-22 10:52:47 -07:00
target
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thermal thermal: Add cooling device's statistics in sysfs 2018-04-02 21:49:01 +08:00
timers timekeeping.txt: Correct maxCount of n-bit binary counter 2018-07-23 09:33:06 -06:00
trace This was a moderately busy cycle for docs, with the usual collection of 2018-08-14 14:29:31 -07:00
translations This was a moderately busy cycle for docs, with the usual collection of 2018-08-14 14:29:31 -07:00
usb USB-serial updates for v4.19-rc1 2018-07-20 21:47:15 +02:00
userspace-api audit/stable-4.18 PR 20180605 2018-06-06 16:34:00 -07:00
virtual KVM: X86: Implement "send IPI" hypercall 2018-08-06 17:59:20 +02:00
vm docs/vm: move ksm and transhuge from "user" to "internals" section. 2018-05-29 06:45:55 -06:00
w1 w1: fix w1_ds2438 documentation 2018-07-07 17:27:13 +02:00
watchdog watchdog: remove bfin_wdt driver 2018-03-26 15:57:04 +02:00
wimax
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x86 Merge branch 'x86-timers-for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/tip/tip 2018-08-13 18:28:19 -07:00
xtensa xtensa: add support for KASAN 2017-12-16 22:37:12 -08:00
.gitignore
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00-INDEX docs: admin-guide: add cgroup-v2 documentation 2018-05-10 15:42:41 -06:00
Changes
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CodingStyle
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DMA-API-HOWTO.txt
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DMA-API.txt
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DMA-ISA-LPC.txt
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DMA-attributes.txt
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IPMI.txt
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IRQ-affinity.txt
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IRQ-domain.txt irqdomain: Kill CONFIG_IRQ_DOMAIN_DEBUG 2018-01-24 12:32:58 +01:00
IRQ.txt
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Intel-IOMMU.txt
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Makefile
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SAK.txt
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SM501.txt
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SubmittingPatches
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atomic_bitops.txt locking/atomic/bitops: Document and clarify ordering semantics for failed test_and_{}_bit() 2018-02-13 14:55:53 +01:00
atomic_t.txt
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bt8xxgpio.txt
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btmrvl.txt
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bus-virt-phys-mapping.txt
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clearing-warn-once.txt kernel debug: support resetting WARN*_ONCE 2017-11-17 16:10:00 -08:00
conf.py ext4: import inode data fork chapter from wiki page 2018-07-29 15:45:00 -04:00
cpu-load.txt
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cputopology.txt
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crc32.txt
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dcdbas.txt
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debugging-modules.txt
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debugging-via-ohci1394.txt
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dell_rbu.txt Documentation: remove stale firmware API reference 2018-05-14 16:44:41 +02:00
digsig.txt
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docutils.conf
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dontdiff
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efi-stub.txt
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eisa.txt
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flexible-arrays.txt
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futex-requeue-pi.txt
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gcc-plugins.txt
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highuid.txt
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hw_random.txt
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hwspinlock.txt
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index.rst Merge git://git.kernel.org/pub/scm/linux/kernel/git/davem/net-next 2018-08-15 15:04:25 -07:00
intel_txt.txt
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io-mapping.txt
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io_ordering.txt
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iostats.txt block: Track DISCARD statistics and output them in stat and diskstat 2018-07-18 08:44:22 -06:00
irqflags-tracing.txt
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isa.txt
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isapnp.txt
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kernel-per-CPU-kthreads.txt
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kobject.txt
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kprobes.txt kprobes/Documentation: Fix various typos 2018-06-22 11:10:55 +02:00
kref.txt
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ldm.txt
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lockup-watchdogs.txt
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logo.gif
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logo.txt
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lsm.txt
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lzo.txt
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mailbox.txt
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memory-barriers.txt sched/Documentation: Update wake_up() & co. memory-barrier guarantees 2018-07-17 09:30:34 +02:00
memory-hotplug.txt
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men-chameleon-bus.txt
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nommu-mmap.txt Documentation: nommu-map: Fix duplicate word typo 2018-06-26 09:01:27 -06:00
ntb.txt
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numastat.txt
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padata.txt
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parport-lowlevel.txt
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percpu-rw-semaphore.txt
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phy.txt
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pi-futex.txt
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pnp.txt
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preempt-locking.txt
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pwm.txt
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rbtree.txt
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remoteproc.txt
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rfkill.txt rfkill: Fix several typos in documentation 2018-06-15 13:36:08 +02:00
robust-futex-ABI.txt
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robust-futexes.txt
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rpmsg.txt
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rtc.txt Documentation: rtc: move iotcl interface documentation to ABI 2018-01-12 00:20:41 +01:00
sgi-ioc4.txt
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siphash.txt
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smsc_ece1099.txt
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speculation.txt Documentation: Document array_index_nospec 2018-01-30 21:54:28 +01:00
static-keys.txt
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svga.txt documentation/svga.txt: update outdated file 2017-11-20 10:45:50 -07:00
switchtec.txt NTB: switchtec_ntb: Update switchtec documentation with notes for NTB 2017-11-18 20:37:13 -05:00
sync_file.txt
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tee.txt
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this_cpu_ops.txt
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unaligned-memory-access.txt
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vfio-mediated-device.txt vfio/mdev: Check globally for duplicate devices 2018-06-08 10:24:27 -06:00
vfio.txt vfio: fix documentation 2018-05-08 09:16:41 -06:00
video-output.txt
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xillybus.txt
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xz.txt
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zorro.txt
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