Re: Clarification on support of arm32 with kernel4.1 for oprofile 1.2.0

Hello Michael,

I have enabled the CONFIG_HW_PERF_EVENTS and tried oprofile -1.2.0 in the
target.

Still the old error persists " ./operf
Your kernel's Performance Events Subsystem does not support your processor
type."

*dmesg | grep -i -e perf -e pmu*
*oprofile: no performance counters*

In dmesg logs, it shows as no performance counters

Could you please share your feedback.

Thanks in Advance!!!

Thanks and Regards,
Vinoth Natarajan.

On Thu, Feb 15, 2018 at 9:37 PM, Michael Petlan <[email protected]> wrote:

> On Thu, 15 Feb 2018, Vinoth Natarajan wrote:
> > Hello Michael,
> > Thanks so much for the help.
> >
> > Cross compiled the hello.c with crosstools-arm-gcc-5.3-linux-
> 4.1-glibc-2.22
> > and tested the executable on the target(arm32)
> >
> > Received the following error
> > " ./hello
> > Error opening leader 1"
> >
>
> This points to the kernel perf subsystem. It cannot even open a simple
> event.
> Not an OProfile's fault.
>
> >
> > Following are the kernel configs related to PERF in target
> >
> >  cat /tmp/test |grep PERF
> >
> > CONFIG_HAVE_PERF_EVENTS=y
> > CONFIG_PERF_USE_VMALLOC=y
> > CONFIG_PERF_EVENTS=y
> > # CONFIG_DEBUG_PERF_USE_VMALLOC is not set
> > CONFIG_HAVE_PERF_REGS=y
> > CONFIG_HAVE_PERF_USER_STACK_DUMP=y
> > # CONFIG_PCIEASPM_PERFORMANCE is not set
> > # CONFIG_HW_PERF_EVENTS is not set
>
> I believe you need CONFIG_HW_PERF_EVENTS=y on ARM.
>
> > # CONFIG_CPU_FREQ_DEFAULT_GOV_PERFORMANCE is not set
> > # CONFIG_CPU_FREQ_GOV_PERFORMANCE is not set
> > # CONFIG_CLS_U32_PERF is not set
> >
> > Could you please share your feedback on this.
>
> You may also try to grep for perf in logs:
>
> # dmesg | grep -i -e perf -e pmu
> [    1.375699] hw perfevents: enabled with armv8_pmuv3_0 PMU driver, 5
> counters available
> [    1.403155] kvm [1]: GICV region size/alignment is unsafe, using
> trapping (reduced performance)
> [    2.036285] xgene-pmu APMC0D5C:00: X-Gene PMU version 2
>
> ^^^ This is a log from the moment when my kernel identified and initialized
> the PMU. You should see something like that too. Or better, after
> recompiling
> your kernel with CONFIG_HW_PERF_EVENTS=y and booting, you should see
> something
> like this (PMU-related logs). If there is some error in PMU init, you will
> see
> it in the logs.
>
> I am afraid that without CONFIG_HW_PERF_EVENTS=y you cannot use the events.
>
> However, I don't guarantee that with CONFIG_HW_PERF_EVENTS=y it works.
> There
> can be some firmware issues, ACPI issues, etc. I roughly remember some
> issue
> when you'd need to boot with acpi=off to access the events, etc.
>
> Cheers,
> Michael
>
> >
> > Thanks in Advance!!!
> >
> > Thanks and Regards,
> > Vinoth Natarajan.
> >
> [...]

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