Messages in this thread | | | Date | Thu, 16 Jan 2003 18:43:47 -0500 (EST) | From | Zwane Mwaikambo <> | Subject | Re: [PATCH] hangcheck-timer |
| |
On Thu, 16 Jan 2003, Joel Becker wrote:
> Folks, > Attached is a patch adding hangcheck-timer. It is used to detect > when the system goes out to lunch for a period of time, and then > returns. This is interesting for debugging drivers as well as for > clustering environments. > The module sets a timer. When the timer goes off, it then uses > get_cycles() to determine how much real time has passed. > On a normal system, the real elapsed time will be almost > identical to the expected timer duration. However, if a device decided > to udelay for 60 seconds (or some other circumstance), the module takes > notice. If the margin of error passes a threshold, the driver prints a > warning or the machine is rebooted. > There are three parameters.
NMI watchdog? Doesn't look like this can catch cases where you have interrupts disabled and spinning on a lock, if you manage to run this code then the box isn't really locked up. In which case the software watchdog should be as good as this.
Zwane -- function.linuxpower.ca
- To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to majordomo@vger.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/
| |