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Message-ID: <20070719154820.GM2216@linux.vnet.ibm.com> Date: Thu, 19 Jul 2007 21:18:20 +0530 From: Srivatsa Vaddagiri <vatsa@...ux.vnet.ibm.com> To: Jeremy Fitzhardinge <jeremy@...p.org> Cc: Jan Glauber <jang@...ux.vnet.ibm.com>, LKML <linux-kernel@...r.kernel.org>, Ingo Molnar <mingo@...e.hu>, mschwid2@...ux.vnet.ibm.com, efault@....de, dmitry.adamushko@...il.com, paulus@...ba.org, anton@...ba.org Subject: Re: [PATCH] virtual sched_clock() for s390 On Thu, Jul 19, 2007 at 08:29:06AM -0700, Jeremy Fitzhardinge wrote: > > - * Monotonic_clock - returns # of nanoseconds passed since time_init() > > + * Scheduler clock - returns current time in nanosec units. > > + * Now based on virtual cpu time to only account time the guest > > + * was actually running. > > > > Runn*ing*? Does it include time the VCPU spends idle/blocked? If not, > then the scheduler won't be able to tell how long a process has been > asleep. Good point .. I think we need a measure of both virtual and real time here - virtual for accounting task-execution time and real for accounting sleep (and perhaps rq-wait?) time. > Maybe this doesn't matter (I had this problem in a version of > Xen's sched_clock, and I can't say I saw an ill effects from it). I guess it will show up as some corner case behaviour, which people are yet to discover on virtual env. -- Regards, vatsa - To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to majordomo@...r.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/
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