Messages in this thread | | | Date | Sun, 23 Dec 2012 16:17:45 -0700 | From | David Ahern <> | Subject | Re: [GIT PULL] perf changes for v3.8 |
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On 12/23/12 2:23 AM, Gleb Natapov wrote: >> Your patch alone was not enough. Start here: >> https://lkml.org/lkml/2012/7/12/3 >> > I cannot reproduce this failure. I reverted 20b279ddb38c and ran "perf > record -e cycles:ppG" while guest was running. Admittedly I ran the test > for a short time, but without disabling PEBS during the guest entry this > was enough to crash a guest.
In the beginning (without any patches) VMs crashed fairly quickly. With your patch it took longer, but I was able to consistently crash VMs. The thread notes server info (processor, OS) and VM versions as well as load used for the tests -- a cpu bound process (openssl), disk bound (dd) and network (netperf).
> What about forcing exclude_guest on an event that > has precise flag set without reporting error to userspace?
That's up to the perf maintainers -- Ingo, Peter, Arnaldo. Personally, I don't like it since kernel side is changing the user request.
David
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