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Date: Fri, 16 Aug 2013 17:13:39 +0200 From: Oleg Nesterov <oleg@...hat.com> To: Frederic Weisbecker <fweisbec@...il.com> Cc: Jaromir Capik <jcapik@...hat.com>, Andrew Morton <akpm@...ux-foundation.org>, Michal Hocko <mhocko@...e.cz>, Martin Schwidefsky <schwidefsky@...ibm.com>, Ingo Molnar <mingo@...nel.org>, Thomas Gleixner <tglx@...utronix.de>, Ania Honess <ahoness@...hat.com>, atomlin@...hat.com, asolanas@...hat.com, linux-kernel@...r.kernel.org Subject: Re: proc/stat: idle goes backward On 08/16, Frederic Weisbecker wrote: > > On Fri, Aug 16, 2013 at 04:47:04PM +0200, Oleg Nesterov wrote: > > > > Questions: > > > > - Any other reason why it can be non-monotonic? > > > > - Should we fix this or should we document that userspace > > should handle this itself? > > > > IOW, is this is bug or not? > > I don't know if we want to fix it (I personally think we should because it is not the > first time I hear complains about this) but if we do, here is a possible fix: > > https://lkml.org/lkml/2013/8/8/638 Thanks! it is not easy to read the patches on lkml.org and I do not understand this code enough. But it seems that this should address my concerns, including the "even ignoring drivers/cpuidle/". Except, I am not sure that these changes handle the case when nr_iowait() change in between. Are you going to resend? Oleg. -- 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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