Messages in this thread | | | Date | Fri, 26 Mar 2010 18:00:25 -0400 | From | Yury Polyanskiy <> | Subject | Re: [PATCH] hangcheck-timer is broken on x86 |
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On Fri, 26 Mar 2010 14:46:49 -0700 Joel Becker <Joel.Becker@oracle.com> wrote:
> On Tue, Mar 23, 2010 at 11:36:11PM -0400, Yury Polyanskiy wrote:
> 1) Does getrawmonotonic() satisfy hangcheck-timer? What I mean is, will > it always return the wallclock nanoseconds even in the face of CPU speed > changes, suspend, udelay, or any other suspension of kernel operation? > Yes, I know this is a tougher standard than rdtsc(), but this is what > hangcheck-timer wants. rdtsc() at least satisfied udelay and PCI hangs.
Yes, as far as I can tell. Note that rdtsc is hosed on suspend-resume.
> > 2) If it does satisfy, why not use it for all hangcheck usage instead of > any ifdefs?
On my part, I didn't want to touch the S390 code since I can't test it.
Yury [unhandled content-type:application/pgp-signature] | |