Re: 2.6.19-rc5: known regressions (v3)

[Andi Kleen]

> On a working kernel on an Opteron, we have normally 4 directories 
> in /dev/oprofile :
> 
> # ls -ld /dev/oprofile/?
> drwxr-xr-x 1 root root 0 15. Nov 12:38 /dev/oprofile/0
> drwxr-xr-x 1 root root 0 15. Nov 12:38 /dev/oprofile/1
> drwxr-xr-x 1 root root 0 15. Nov 12:38 /dev/oprofile/2
> drwxr-xr-x 1 root root 0 15. Nov 12:38 /dev/oprofile/3
> 
> With linux-2.6.19-rc5, the first one (0) is missing and we get 1,2,3

That's because 0 was never available. It is used by the NMI watchdog.
The new kernel doesn't give it to oprofile anymore.

> Maybe the 'bug' is in oprofile tools, that currently expect to find '0'

Yes, it's likely a user space issue.

-Andi

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