softlockup watchdog improvements
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b4 am [email protected]Versions newest first
- v1 Latest2 patches 9 repliesIn review
Patches in v1 No applies recorded yet
| # | Subject and files | Size | Replies | Applied |
|---|---|---|---|---|
| 1/2 | Ignore stolen time in the softlockup watchdogkernel/ | +19 | 8 replies | |
| 2/2 | percpu enable flag for softlockup watchdoginclude/ kernel/ kernel/ | +42 | 1 reply |
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Cover letter [patch 0/2] softlockup watchdog improvements
Here's couple of patches to improve the softlockup watchdog.
The first changes the softlockup timer from using jiffies to sched_clock() as a timebase. Xen and VMI implement sched_clock() as counting unstolen time, so time stolen by the hypervisor won't cause the watchdog to bite.
The second adds per-cpu enable flags for the watchdog timer. This allows the timer to be disabled when the CPU goes into a (potentially unbounded) tickless sleep.
I know this conflicts with fix-bogus-softlockup-warning-with-sysrq-t.patch in -mm2. I think that patch incorrectly changes the behaviour of the softlockup watchdog, and a better solution is to temporarily disable the watchdog while doing something known to be cpu-consuming, like a long sysreq output.
J