[aarch64-port-dev ] Java callstacks are truncated in perf on aarch64

[Alexeev, Alexander]

As far as I understand this is controversial topic if perf should recognize java frames or JVM has a mode where stacks can be traced. One way or another it is critical for performance tuning to be able to  collect performance profiles with call trees, otherwise analysis is too complex. It is important especially now when aarch64 doesn't have solid performance.

Even if it was coincidence why not to keep it or  provide an option for profiling? As far as I can see X86  version  works with perf.

Alexander
________________________________________
From: Andrew Haley [aph at redhat.com]
Sent: 06 May 2015 14:24
To: Alexeev, Alexander; aarch64-port-dev at openjdk.java.net
Subject: Re: [aarch64-port-dev ] Java callstacks are truncated in perf on aarch64

On 05/06/2015 12:10 PM, Alexeev, Alexander wrote:
> What might be wrong?

It's not supposed to work.  perf does not understand java frames.
If anything works it's an accident.

Andrew.