diff options
Diffstat (limited to 'lib/Kconfig.debug')
| -rw-r--r-- | lib/Kconfig.debug | 84 |
1 files changed, 72 insertions, 12 deletions
diff --git a/lib/Kconfig.debug b/lib/Kconfig.debug index 376784ad3545..781f061ec0fa 100644 --- a/lib/Kconfig.debug +++ b/lib/Kconfig.debug @@ -1035,27 +1035,30 @@ config BOOTPARAM_SOFTLOCKUP_PANIC Say N if unsure. -config HARDLOCKUP_DETECTOR_PERF +config HAVE_HARDLOCKUP_DETECTOR_BUDDY bool - select SOFTLOCKUP_DETECTOR + depends on SMP + default y # -# Enables a timestamp based low pass filter to compensate for perf based -# hard lockup detection which runs too fast due to turbo modes. +# Global switch whether to build a hardlockup detector at all. It is available +# only when the architecture supports at least one implementation. There are +# two exceptions. The hardlockup detector is never enabled on: # -config HARDLOCKUP_CHECK_TIMESTAMP - bool - +# s390: it reported many false positives there # -# arch/ can define HAVE_HARDLOCKUP_DETECTOR_ARCH to provide their own hard -# lockup detector rather than the perf based detector. +# sparc64: has a custom implementation which is not using the common +# hardlockup command line options and sysctl interface. # config HARDLOCKUP_DETECTOR bool "Detect Hard Lockups" - depends on DEBUG_KERNEL && !S390 - depends on HAVE_HARDLOCKUP_DETECTOR_PERF || HAVE_HARDLOCKUP_DETECTOR_ARCH + depends on DEBUG_KERNEL && !S390 && !HARDLOCKUP_DETECTOR_SPARC64 + depends on HAVE_HARDLOCKUP_DETECTOR_PERF || HAVE_HARDLOCKUP_DETECTOR_BUDDY || HAVE_HARDLOCKUP_DETECTOR_ARCH + imply HARDLOCKUP_DETECTOR_PERF + imply HARDLOCKUP_DETECTOR_BUDDY + imply HARDLOCKUP_DETECTOR_ARCH select LOCKUP_DETECTOR - select HARDLOCKUP_DETECTOR_PERF if HAVE_HARDLOCKUP_DETECTOR_PERF + help Say Y here to enable the kernel to act as a watchdog to detect hard lockups. @@ -1065,6 +1068,63 @@ config HARDLOCKUP_DETECTOR chance to run. The current stack trace is displayed upon detection and the system will stay locked up. +# +# Note that arch-specific variants are always preferred. +# +config HARDLOCKUP_DETECTOR_PREFER_BUDDY + bool "Prefer the buddy CPU hardlockup detector" + depends on HARDLOCKUP_DETECTOR + depends on HAVE_HARDLOCKUP_DETECTOR_PERF && HAVE_HARDLOCKUP_DETECTOR_BUDDY + depends on !HAVE_HARDLOCKUP_DETECTOR_ARCH + help + Say Y here to prefer the buddy hardlockup detector over the perf one. + + With the buddy detector, each CPU uses its softlockup hrtimer + to check that the next CPU is processing hrtimer interrupts by + verifying that a counter is increasing. + + This hardlockup detector is useful on systems that don't have + an arch-specific hardlockup detector or if resources needed + for the hardlockup detector are better used for other things. + +config HARDLOCKUP_DETECTOR_PERF + bool + depends on HARDLOCKUP_DETECTOR + depends on HAVE_HARDLOCKUP_DETECTOR_PERF && !HARDLOCKUP_DETECTOR_PREFER_BUDDY + depends on !HAVE_HARDLOCKUP_DETECTOR_ARCH + select HARDLOCKUP_DETECTOR_COUNTS_HRTIMER + +config HARDLOCKUP_DETECTOR_BUDDY + bool + depends on HARDLOCKUP_DETECTOR + depends on HAVE_HARDLOCKUP_DETECTOR_BUDDY + depends on !HAVE_HARDLOCKUP_DETECTOR_PERF || HARDLOCKUP_DETECTOR_PREFER_BUDDY + depends on !HAVE_HARDLOCKUP_DETECTOR_ARCH + select HARDLOCKUP_DETECTOR_COUNTS_HRTIMER + +config HARDLOCKUP_DETECTOR_ARCH + bool + depends on HARDLOCKUP_DETECTOR + depends on HAVE_HARDLOCKUP_DETECTOR_ARCH + help + The arch-specific implementation of the hardlockup detector will + be used. + +# +# Both the "perf" and "buddy" hardlockup detectors count hrtimer +# interrupts. This config enables functions managing this common code. +# +config HARDLOCKUP_DETECTOR_COUNTS_HRTIMER + bool + select SOFTLOCKUP_DETECTOR + +# +# Enables a timestamp based low pass filter to compensate for perf based +# hard lockup detection which runs too fast due to turbo modes. +# +config HARDLOCKUP_CHECK_TIMESTAMP + bool + config BOOTPARAM_HARDLOCKUP_PANIC bool "Panic (Reboot) On Hard Lockups" depends on HARDLOCKUP_DETECTOR |