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Message-Id: <20150105140950.9ef64425359c62475b48733d@linux-foundation.org> Date: Mon, 5 Jan 2015 14:09:50 -0800 From: Andrew Morton <akpm@...ux-foundation.org> To: Cyril Bur <cyrilbur@...il.com> Cc: linux-kernel@...r.kernel.org, mpe@...erman.id.au, drjones@...hat.com, dzickus@...hat.com, mingo@...nel.org, uobergfe@...hat.com, chaiw.fnst@...fujitsu.com, cl@...u.com, fabf@...net.be, atomlin@...hat.com, benzh@...omium.org Subject: Re: [PATCH 0/2] Quieten softlockup detector on virtualised kernels On Mon, 22 Dec 2014 16:06:02 +1100 Cyril Bur <cyrilbur@...il.com> wrote: > When the hypervisor pauses a virtualised kernel the kernel will observe a jump > in timebase, this can cause spurious messages from the softlockup detector. > > Whilst these messages are harmless, they are accompanied with a stack trace > which causes undue concern and more problematically the stack trace in the > guest has nothing to do with the observed problem and can only be misleading. > > Futhermore, on POWER8 this is completely avoidable with the introduction of > the Virtual Time Base (VTB) register. Does this problem apply to other KVM implementations and to Xen? If so, what would implementations of running_clock() for those look like? If not, why not? -- 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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