topic Re: error for using oprofile.ko to profiling in i.MX Processors

error for using oprofile.ko to profiling

jojorong — Fri, 17 May 2013 03:23:35 GMT

Hi,

I use the oprofile to measured the performance of my application, there something wrong to use the oprofile.ko as following in yocto "dylan":

It's known issue or bug ?

root@imx6qsabresd:~# opcontrol --start --separate=lib --no-vmlinux -c 5

oprofile: using arm/armv7-ca9

ATTENTION: Use of opcontrol is discouraged. Please see the man page for operf.

Detected stale lock file. Removing.

Using default event: CPU_CYCLES:100000:0:1:1

Using 2.6+ OProfile kernel interface.

Using log file /var/lib/oprofile/samples/oprofiled.log

Daemon started.

irq 126: nobody cared (try booting with the "irqpoll" option)

[<800478f0>] (unwind_backtrace+0x0/0xf8) from [<800b08e4>] (__report_bad_irq+0x24/0xc0)

[<800b08e4>] (__report_bad_irq+0x24/0xc0) from [<800b0c2c>] (note_interrupt+0x1ec/0x248)

[<800b0c2c>] (note_interrupt+0x1ec/0x248) from [<800af168>] (handle_irq_event_percpu+0xa8/0x180)

[<800af168>] (handle_irq_event_percpu+0xa8/0x180) from [<800af27c>] (handle_irq_event+0x3c/0x5c)

[<800af27c>] (handle_irq_event+0x3c/0x5c) from [<800b15f0>] (handle_fasteoi_irq+0x98/0x158)

[<800b15f0>] (handle_fasteoi_irq+0x98/0x158) from [<800aea68>] (generic_handle_irq+0x20/0x34)

[<800aea68>] (generic_handle_irq+0x20/0x34) from [<800419b0>] (handle_IRQ+0x4c/0xb0)

[<800419b0>] (handle_IRQ+0x4c/0xb0) from [<80040b4c>] (__irq_svc+0x4c/0xe8)

[<80040b4c>] (__irq_svc+0x4c/0xe8) from [<80079618>] (__do_softirq+0x50/0x150)

[<80079618>] (__do_softirq+0x50/0x150) from [<80079ba0>] (irq_exit+0x94/0x9c)

[<80079ba0>] (irq_exit+0x94/0x9c) from [<8003b1c8>] (do_local_timer+0x70/0x94)

[<8003b1c8>] (do_local_timer+0x70/0x94) from [<80040b4c>] (__irq_svc+0x4c/0xe8)

Exception stack(0xba99bd68 to 0xba99bdb0)

bd60: bf1b5800 bf1b6000 00000020 0000001f bf4ac000 bf1b5000

bd80: 2ad3e000 8bfe36a0 0004f4ac ba954ab0 bac5aea0 00000002 00000000 ba99bdb0

bda0: 8004dc08 8004dad0 800f0113 ffffffff

[<80040b4c>] (__irq_svc+0x4c/0xe8) from [<8004dad0>] (v7_flush_kern_dcache_area+0x28/0x3c)

[<8004dad0>] (v7_flush_kern_dcache_area+0x28/0x3c) from [<8004dc08>] (v6_copy_user_highpage_nonaliasing+0x40/0x54)

[<8004dc08>] (v6_copy_user_highpage_nonaliasing+0x40/0x54) from [<800dc8d8>] (do_wp_page+0xe4/0x72c)

[<800dc8d8>] (do_wp_page+0xe4/0x72c) from [<800de8d8>] (handle_pte_fault+0x3b0/0x7d8)

[<800de8d8>] (handle_pte_fault+0x3b0/0x7d8) from [<800dedd0>] (handle_mm_fault+0xd0/0x120)

[<800dedd0>] (handle_mm_fault+0xd0/0x120) from [<8004b3a0>] (do_page_fault+0x18c/0x2f8)

[<8004b3a0>] (do_page_fault+0x18c/0x2f8) from [<8003b370>] (do_DataAbort+0x34/0x98)

[<8003b370>] (do_DataAbort+0x34/0x98) from [<80041084>] (ret_from_exception+0x0/0x10)

Exception stack(0xba99bfb0 to 0xba99bff8)

bfa0: 00000328 00000000 00000000 0000029d

bfc0: 00000328 00000000 47f01400 00000078 2ad3e4c0 0016b948 0000029d 7ee649c4

bfe0: 00000000 7ee649a8 2ad3e000 47e6bf20 600f0010 ffffffff

handlers:

[<80049c24>] armv7pmu_handle_irq

Disabling IRQ #126

Profiler running.

root@imx6qsabresd:~# testprogram

root@imx6qsabresd:~# opcontrol --stop

Stopping profiling.

root@imx6qsabresd:~# opreport -l testprogram > ~/imx6.op.txt

Using /var/lib/oprofile/samples/ for samples directory.

error: no sample files found: profile specification too strict ?

Re: error for using oprofile.ko to profiling

rebelalliance — Wed, 17 Jul 2013 22:49:11 GMT

I am getting the same error. I cross compiled oprofile 0.9.8 and upon running operf, I get this crash:

irq 126: nobody cared (try booting with the "irqpoll" option)

[<80048854>] (unwind_backtrace+0x0/0xf8) from [<800acf20>] (__report_bad_irq+0x28/0xc4)

[<800acf20>] (__report_bad_irq+0x28/0xc4) from [<800ad264>] (note_interrupt+0x1e4/0x240)

[<800ad264>] (note_interrupt+0x1e4/0x240) from [<800ab7b0>] (handle_irq_event_percpu+0xa8/0x180)

[<800ab7b0>] (handle_irq_event_percpu+0xa8/0x180) from [<800ab8c4>] (handle_irq_event+0x3c/0x5c)

[<800ab8c4>] (handle_irq_event+0x3c/0x5c) from [<800adc48>] (handle_fasteoi_irq+0xbc/0x154)

[<800adc48>] (handle_fasteoi_irq+0xbc/0x154) from [<800ab0c0>] (generic_handle_irq+0x28/0x3c)

[<800ab0c0>] (generic_handle_irq+0x28/0x3c) from [<80042870>] (handle_IRQ+0x4c/0xac)

[<80042870>] (handle_IRQ+0x4c/0xac) from [<80041a0c>] (__irq_svc+0x4c/0xe8)

[<80041a0c>] (__irq_svc+0x4c/0xe8) from [<80106c94>] (sys_select+0xc4/0x10c)

[<80106c94>] (sys_select+0xc4/0x10c) from [<80041fc0>] (ret_fast_syscall+0x0/0x30)

handlers:

[<8004ab24>] armv7pmu_handle_irq

Disabling IRQ #126

My hardware is SabreSD with i.MX6Q and 4.0.0 Linux BSP.

I was really hoping to profile my app to see where I need to optimize. Is there a fix/workaround for this?

Please advise.

Re: Re: error for using oprofile.ko to profiling

tarteauxfraises — Tue, 10 Sep 2013 09:32:18 GMT

This bug is described here: [PATCH 0/9] ARM perf updates for 3.7. I made a kernel patch on file "arch/arm/plat-mxc/devices/platform-imx-pmu.c".

Be carefull, this patch doesn't solve the heart of the problem: "We have only one interrupt for 4 core and fo 4 PMU.". The measures may be imprecise!!

24a25,47
> #include <linux/smp.h>
>
> /*
>  * The PMU IRQ lines of four cores are wired together into a single interrupt.
>  * Bounce the interrupt to the other core if it's not ours.
>  */
> static irqreturn_t mx6_pmu_handler(int irq, void *dev, irq_handler_t handler)
> {
>     irqreturn_t ret = handler(irq, dev);
>     int id = smp_processor_id();
>     int next_id = (id + 1) % setup_max_cpus;
>
>     if (ret == IRQ_NONE && cpu_online(next_id))
>         irq_set_affinity(irq, cpumask_of(next_id));
>
>     /*
>      * We should be able to get away with the amount of IRQ_NONEs we give,
>      * while still having the spurious IRQ detection code kick in if the
>      * interrupt really starts hitting spuriously.
>      */
>     return ret;
> }
>
27,31c50,58
<         [0] = {
<                 .start  = MXC_INT_CHEETAH_PERFORM,
<                 .end    = MXC_INT_CHEETAH_PERFORM,
<                 .flags  = IORESOURCE_IRQ,
<         },
---
>     [0] = {
>         .start    = MXC_INT_CHEETAH_PERFORM,
>         .end    = MXC_INT_CHEETAH_PERFORM,
>         .flags    = IORESOURCE_IRQ,
>     },
> };
>
> static struct arm_pmu_platdata mx6_pmu_platdata = {
>     .handle_irq        = mx6_pmu_handler,
35,38c62,66
<         .name           = "arm-pmu",
<         .id             = ARM_PMU_DEVICE_CPU,
<         .num_resources  = ARRAY_SIZE(mx6_pmu_resources),
<         .resource       = mx6_pmu_resources,
---
>     .name        = "arm-pmu",
>     .id        = ARM_PMU_DEVICE_CPU,
>     .num_resources    = ARRAY_SIZE(mx6_pmu_resources),
>     .resource    = mx6_pmu_resources,
>     .dev.platform_data    = &mx6_pmu_platdata,
43c71
<         platform_device_register(&mx6_pmu_device);
---
>     platform_device_register(&mx6_pmu_device);
44a73
>

Re: Re: error for using oprofile.ko to profiling

rebelalliance — Wed, 18 Sep 2013 21:24:16 GMT

Ok, thank you. :smileyhappy:

Re: error for using oprofile.ko to profiling

daiane_angolini — Fri, 20 Sep 2013 13:27:27 GMT

Last information I got on this issue is that it´s documented on ERR006259 (http://cache.freescale.com/files/32bit/doc/errata/IMX6DQCE.pdf?fpsp=1&WT_TYPE=Errata&WT_VENDOR=FREESCALE&WT_FILE_FORMAT=…)

And there is one "known workaround"

Symbol: HW_PERF_EVENTS [=y]

│ Type : boolean

│ Prompt: Enable hardware performance counter support for perf events

│ Defined at arch/arm/Kconfig:1582

│ Depends on: PERF_EVENTS [=y] && CPU_HAS_PMU [=y]

│ Location:

│ -> Kernel Features

Re: error for using oprofile.ko to profiling

daiane_angolini — Fri, 20 Sep 2013 13:29:41 GMT

oprofile on the iMX6 platform error