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| author | Ingo Molnar <mingo@elte.hu> | 2010-08-05 08:45:05 +0200 |
|---|---|---|
| committer | Ingo Molnar <mingo@elte.hu> | 2010-08-05 08:45:05 +0200 |
| commit | 61be7fdec2f51b99570cd5dcc30c7848c8e56513 (patch) | |
| tree | 4a73ee635bc3e35dc54f75caddd26ffb6238bb5c /lib | |
| parent | 12a81c8df13c60904febcafcf6b90ca1acb67122 (diff) | |
| parent | eb703f98191a505f78d0066712ad67d5dedc4c90 (diff) | |
| download | lwn-61be7fdec2f51b99570cd5dcc30c7848c8e56513.tar.gz lwn-61be7fdec2f51b99570cd5dcc30c7848c8e56513.zip | |
Merge branch 'perf/nmi' into perf/core
Conflicts:
kernel/Makefile
Merge reason: Add the now complete topic, fix the conflict.
Signed-off-by: Ingo Molnar <mingo@elte.hu>
Diffstat (limited to 'lib')
| -rw-r--r-- | lib/Kconfig.debug | 35 |
1 files changed, 20 insertions, 15 deletions
diff --git a/lib/Kconfig.debug b/lib/Kconfig.debug index e722e9d62221..e2cd7fbf31c0 100644 --- a/lib/Kconfig.debug +++ b/lib/Kconfig.debug @@ -152,28 +152,33 @@ config DEBUG_SHIRQ Drivers ought to be able to handle interrupts coming in at those points; some don't and need to be caught. -config DETECT_SOFTLOCKUP - bool "Detect Soft Lockups" +config LOCKUP_DETECTOR + bool "Detect Hard and Soft Lockups" depends on DEBUG_KERNEL && !S390 - default y help - Say Y here to enable the kernel to detect "soft lockups", - which are bugs that cause the kernel to loop in kernel + Say Y here to enable the kernel to act as a watchdog to detect + hard and soft lockups. + + Softlockups are bugs that cause the kernel to loop in kernel mode for more than 60 seconds, without giving other tasks a - chance to run. + chance to run. The current stack trace is displayed upon + detection and the system will stay locked up. - When a soft-lockup is detected, the kernel will print the - current stack trace (which you should report), but the - system will stay locked up. This feature has negligible - overhead. + Hardlockups are bugs that cause the CPU to loop in kernel mode + for more than 60 seconds, without letting other interrupts have a + chance to run. The current stack trace is displayed upon detection + and the system will stay locked up. + + The overhead should be minimal. A periodic hrtimer runs to + generate interrupts and kick the watchdog task every 10-12 seconds. + An NMI is generated every 60 seconds or so to check for hardlockups. - (Note that "hard lockups" are separate type of bugs that - can be detected via the NMI-watchdog, on platforms that - support it.) +config HARDLOCKUP_DETECTOR + def_bool LOCKUP_DETECTOR && PERF_EVENTS && HAVE_PERF_EVENTS_NMI config BOOTPARAM_SOFTLOCKUP_PANIC bool "Panic (Reboot) On Soft Lockups" - depends on DETECT_SOFTLOCKUP + depends on LOCKUP_DETECTOR help Say Y here to enable the kernel to panic on "soft lockups", which are bugs that cause the kernel to loop in kernel @@ -190,7 +195,7 @@ config BOOTPARAM_SOFTLOCKUP_PANIC config BOOTPARAM_SOFTLOCKUP_PANIC_VALUE int - depends on DETECT_SOFTLOCKUP + depends on LOCKUP_DETECTOR range 0 1 default 0 if !BOOTPARAM_SOFTLOCKUP_PANIC default 1 if BOOTPARAM_SOFTLOCKUP_PANIC |