On Fri, Jan 09, 2015 at 02:15:00PM +1100, Cyril Bur wrote: > > > > I am not too familar with it, but the kernel/watchdog.c code has calls to > > kvm_check_and_clear_guest_paused(), which is probably a good place to > > start. > > > Ah yes that, I did initially have a look at what it does when I > undertook to solve the problem on power and I suppose the two solutions > are similar in that they both just use a virtualised time source. The > similarities stop there though, the paravirtualised clock that x86 uses > provides (as the name of the function implies) a 'was paused' flag. > Obviously the flag isn't something the vtb register on power8 can > provide and since we have a vtb, its preferable to use that. > Perhaps x86 can do something with running_clock?
Marcello? Drew? Cheers, Don > > Regards, > > Cyril > > > Cheers, > > Don > > > > > > > > > Not sure if that is useful or could be incoporated into the power8 code. > > > > Though to be honest I am curious if the steal_time code could be ported > > > > to > > > > your solution as it seems the watchdog code could remove all the > > > > steal_time warts. > > > Happy to help sus out the situation here, again, if you could pass on > > > what the x86 guys are working on, thanks. > > > > > > > > > Thanks, > > > > > > Cyril > > > > I have cc'd Marcelo into this discussion as he was the last person I > > > > remember talking with about this problem. > > > > > > > > Cheers, > > > > Don > > > > > > > > > -- To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to majord...@vger.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/