We actually did something very similar with that patch to oprofile
0.9.1 which comes with Android 4.3. The problem is that only one
cpu is getting samples even if we're running a multi-threaded
School of Computer Science
College of Computing
Georgia Institute of Technology
On 12/28/2013 10:57 AM, Leonid Moiseichuk wrote:
you tried my patch I have send into list several times?
version is here , for us it seems works for oprofile and
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 :
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.
We are not able to collect the samples from any
core except for core 0.
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
Any help to solve this would be really grateful.
Attached is the modified oprofile_perf.c