Hardware Watchdog Device in pSeries?
alanr at unix.sh
Fri Oct 15 01:56:14 EST 2004
Arnd Bergmann wrote:
> On Middeweken 13 Oktober 2004 21:23, Linas Vepstas wrote:
>>On Wed, Oct 13, 2004 at 12:01:45PM -0600, Alan Robertson was heard to remark:
>>>This would be a logical equivalent to the well-known and long-standing
>>>'softdog' device driver which already has a well-known API, which is also
>>>implemented on other hardware devices and architectures.
>>>So, my suggestion would be that if it were moved to a userspace driver,
>>>that the softdog API be retained.
>>I might have volunteered to hack this up real quick, were it not for
>>Mike Strosaker's correction, that the surveillance featues were taken
>>out of Power5.
> FWIW, s390 linux has just added support for a hypervisor watchdog 
> that looks like a hardware watchdog to linux, but is implemented with
> hypercalls ("diag 0x288"). Since Power5 is typically running in hypervisor
> more, the watchdog interface could be provided completely by the
The method of implementation isn't that important. Are these hypervisor
calls (or equivalent) provided by power5?
Is there any disadvantage to running under the hypervisor?
Alan Robertson <alanr at unix.sh>
"Openness is the foundation and preservative of friendship... Let me claim
from you at all times your undisguised opinions." - William Wilberforce
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