[Xen-users] perf hardware event on ARM64

[Jintack Lim <jintack@xxxxxxxxxxxxxxx>]

Hi,

I'm working on ARM64 (AppliedMicroâ X-Gene).

I wanted to run perf to collect some hardware events, but I got some trouble.

Basically I have two questions.

1.Â

I found that pmu is not registered in the device tree,

while it is registered on native linux (installed on the same type of machine) .

Can I just modify device tree at booting time to make it look like native linux?

Will it work?

Additional information is at the bottom.

2.Â

I found that running perf on Xen 4.5.0 resulted in segmentation fault (or system crash),

however it runs well on the latest Xen on git server.

Can somebody point the patch that makes this change?

I eventually run perf on Xen 4.5.0.

Some additional information is,

1.ÂCONFIG_HW_PERF_EVENTS=y in both of Xen and native.

2. Native linux shows this line at booting,

hw perfevents: enabled with arm/armv8-pmuv3 PMU driver, 5 counters available

while Xen Dom0 shows this line.

hw perfevents: enabled with arm/armv8-pmuv3 PMU driver, 1 counters available

3. perf list command shows nothing on Xen Dom0,

but it shows quite a lot on native.

 cpu-cycles OR cycles                [Hardware event]

 instructions                    [Hardware event]

 cache-references                  [Hardware event]

 cache-misses                    [Hardware event]

 branch-misses                   Â[Hardware event]

 ref-cycles                     [Hardware event]

 L1-dcache-loads                  Â[Hardware cache event]

 L1-dcache-load-misses               Â[Hardware cache event]

 L1-dcache-stores                  [Hardware cache event]

 L1-dcache-store-misses               [Hardware cache event]

 branch-loads                    [Hardware cache event]

 branch-load-misses                 [Hardware cache event]

Thanks,

Jintack

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