On 7/29/15 1:27 PM, Brendan Gregg wrote:
Thanks, yes. This took me by surprise: I've been profiling different
Xen guests for over a year, but this is the first time I've hit this.
All my other Xen guests:
# dmesg | grep Performance
[ 0.058664] Performance Events: unsupported p6 CPU model 62 no PMU
driver, software events only.
This linux 4.1 Xen guest:
# dmesg | grep Performance
[ 0.258140] Performance Events: 16-deep LBR, IvyBridge events,
Intel PMU driver.
yep and since the hypervisor lies perf has no means of knowing to
fallback to cpu-clock.
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