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Re: No sample file found
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From: <job...@ao...> - 2009-11-09 22:33:27
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On Nov 9, 2009, at 12:35 PM, Maynard Johnson <may...@us...>
wrote:
> job...@ao... wrote:
>> Following a posting from last year "/etc/mtab not present on my
>> busybox system," I was able to fix both the "Kernel support not
>> available" and the "Device or resource busy" errors by replacing /
>> etc/mtab with /proc/mounts.
>> I am still seeing:
>> oprofiled: open of /var/lib/oprofile/samples//current/{root}//root/
>> freescale_test/{dep}/{root}//root/freescale_test/TIMER.
>> 0.0.all.all.all failed: Invalid argument
>> repeated over and over in oprofiled.log. This happens because
>> the call to mmap in odb_open in libdb/db_manage.c is returning
>> MAP_FAILED. The arguments to mmap are start = 0, length = 2680,
>> prot = 3, flags = MAP_SHARED, fd = 5, offset = 0. errno = 22
>> (Invalid argument)
>> What could cause any of these arguments to be invalid?
> mmap is a syscall, and I have no idea why it would be failing for
> you here since the args being passed are not atypical (instrumenting
> the daemon running on my system, I see the exact same args). I'm
> not seeing any evidence that anyone else has ever seen this
> particular error involving oprofile, so you're experiencing
> something unique. Is the kernel you're running on from kernel.org
> or is it a distro kernel? Have you rebooted the system since you've
> seen this problem? Can you reproduce the mmap error with a simple
> program -- or are you only seeing this with oprofile?
According to http://wiki.laptop.org/go/Oprofile_setup, "The jffs2
file system does NOT support the mechanism that OProfile uses."
Following the example on that page, I ran the following commands after
rebooting my board:
Eclipse # insmod oprofile.ko
Eclipse # rm -rf /var/lib/oprofile
Eclipse # mkdir /var/lib/oprofile
Eclipse # mount -t ramfs none /var/lib/oprofile
Eclipse # opcontrol --setup --no-vmlinux --separate=library
Eclipse # opcontrol --start
Eclipse # opcontrol --shutdown
Eclipse # opreport
I am now getting a report:
CPU: CPU with timer interrupt, speed 0 MHz (estimated)
Profiling through timer interrupt
TIMER:0|
samples| %|
------------------
18544 99.2454 no-vmlinux
84 0.4496 EclipseMSW.elf.CVS
TIMER:0|
samples| %|
------------------
68 80.9524 EclipseMSW.elf.CVS
15 17.8571 libc-2.6.so
1 1.1905 libEclipsePai.so
35 0.1873 busybox
TIMER:0|
samples| %|
------------------
13 37.1429 ld-2.6.so
12 34.2857 busybox
10 28.5714 libc-2.6.so
9 0.0482 oprofiled
TIMER:0|
samples| %|
------------------
8 88.8889 oprofiled
1 11.1111 libc-2.6.so
6 0.0321 snmpd
TIMER:0|
samples| %|
------------------
4 66.6667 snmpd
2 33.3333 libc-2.6.so
6 0.0321 dropbearmulti
TIMER:0|
samples| %|
------------------
4 66.6667 dropbearmulti
2 33.3333 libc-2.6.so
1 0.0054 opjitconv
TIMER:0|
samples| %|
------------------
1 100.000 ld-2.6.so
>
> -Maynard
>> On Nov 6, 2009, at 12:00 PM, job...@ao... wrote:
>>> I must confess that I had previously altered check_version() to
>>> avoid a "Kernel support not available" error I was getting
>>> initially because my kernel should support oprofile. So, I went
>>> back to the original version and this is what happens when I try
>>> to start oprofile after rebooting my board:
>>>
>>> Eclipse # insmod oprofile.ko
>>> Eclipse # /usr/bin/opcontrol --init
>>> Kernel support not available, missing opcontrol --init as root ?
>>>
>>> /etc/mtab is empty. I am doing everything as root.
>>>
>>> I apologize for having bypassed this error. Should "oprofilefs"
>>> appear in /etc/mtab after inmod'ing oprofile.ko and doing
>>> opcontrol --init?
>>>
>>> Sent from my iPhone 3G
>>>
>>> On Nov 6, 2009, at 10:19 AM, Maynard Johnson <may...@us...>
>>> wrote:
>>>
>>>> Robert Richter wrote:
>>>>> On 03.11.09 10:21:40, job...@ao... wrote:
>>>>>> I tried that and am still seeing the "bad magic number" error
>>>>>> when running opreport and "Invalid argument" entries in
>>>>>> oprofiled.log.
>>>>>>
>>>>>>
>>>>>> The commands I am using and part of oprofiled.log follow. Any
>>>>>> suggestions?
>>>>>>
>>>>>> Eclipse # rm /var/lib/oprofile/samples/oprofiled.log
>>>>>> Eclipse # rm -rf /var/lib/oprofile/samples/current/
>>>>>> Eclipse # cd /usr/bin/
>>>>>> Eclipse # ./opcontrol --init
>>>>>> mount: mounting nodev on /dev/oprofile failed: Device or
>>>>>> resource busy
>>>>> There is an error mounting oprofilefs, try the following steps to
>>>>> debug this:
>>>> You need to figure out why the init is failing. Any oprofile
>>>> commands you do afterwards are useless until you fix this. It
>>>> sounds to me like you still have an oprofile daemon running. Do
>>>> 'ps awx |grep oprofiled' to see if the daemon is running. If so,
>>>> do:
>>>> 1. opcontrol --deinit
>>>> 2. rm /root/.oprofile/daemonrc
>>>> 3. opcontrol --init
>>>> 4. Execute your other opcontrol setup commands to specify
>>>> profiling parameters
>>>> 5. 'opcontrol --start' and run your app.
>>>> 6. generate your report(s) with opreport
>>>>
>>>> If the 'ps' command shows oprofiled is not running, you need to
>>>> determine why you're getting "Device or resource busy". Look at
>>>> dmesg. Are there any other perf tools on the system that might
>>>> be using the performance monitoring hardware?
>>>>
>>>>
>>>> -Maynard
>>>>> First, unmount /dev/oprofile if it is there.
>>>>> The script tries to mount the oprofile filesystem that the kernel
>>>>> should provide. It checks /proc/filesystems, you should get
>>>>> something
>>>>> like this on your system:
>>>>> # cat /proc/filesystems | grep oprofile
>>>>> nodev oprofilefs
>>>>> If it is not there, the script tries then to load the oprofile
>>>>> module
>>>>> and checks the filesystem again. oprofile should then be listed in
>>>>> /proc/modules and also oprofilefs in /proc/filesystems. If not,
>>>>> the
>>>>> script fails. Maybe /proc is disabled or not available? Not sure
>>>>> if
>>>>> this is a config option.
>>>>> You can also try to mount oprofile directly:
>>>>> # mkdir /dev/oprofile
>>>>> # mount -t oprofilefs nodev /dev/oprofile
>>>>> Also, it seems you are using an own build of oprofile, which
>>>>> version
>>>>> are you using. Did you use configure/make/make install to
>>>>> install the
>>>>> package on your system? Which config did you use to compile your
>>>>> kernel?
>>>>> -Robert
>>>>
>>> =
>>> ---
>>> ---
>>> ---
>>> ---
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>
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