RE: Problem running OProfile on Krait

[Leonid M. <l.m...@sa...>]

Hi,

 

Might you tried my patch I have send into list several times?

Last version is here [1], for us it seems works for oprofile and operf.

 

Best Wishes,

Leonid

 

[1] http://marc.info/?l=oprofile-list
<http://marc.info/?l=oprofile-list&m=138778429921802&w=2>
&m=138778429921802&w=2 

 

From: machiry aravind [mailto:mac...@ho...] 
Sent: 27 December 2013 12:49
To: opr...@li...; xin...@gm...
Subject: RE: Problem running OProfile on Krait

 

Hi all,


We are trying to run OProfile on Nexus 7 having Krait CPU. (Actually,
Oprofile doesn't recognize krait but since, Krait is similar to Cortex-A15
we used event mappings of Cortex-A15).

The problem we are facing is :

Background:
  As Krait has 4-cores and linux kernel being SMP system, all cores except
for core 0, go offline and come online as and when load demands.

Problem:
   We are not able to collect the samples from any core except for core 0.

We tried:
   We tried using register_cpu_notifier to register for CPU status changes,
so that we can register for overflow interrupts when a CPU come online, but
these registered overflow interrupts are never called.

Any help to solve this would be really grateful.

Attached is the modified oprofile_perf.c 

Thanks,
Aravind