Re: No sample file found

[<job...@ao...>]

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?



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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