Re: oprofile: profiling kernel

[Baruch Even]

li nux wrote:
> Using oprofile Is it possible to profile how many
> times  a function say try_to_unmap_cluster() is called
> within the kernel in a certain time interval ?
> If yes, then how ?
> What settings are needed for that.

No. That's not possible with oprofile.

To get something like that I hack the code and use relayfs to transfer 
the data to user-space.

Note, the examples for relayfs show using sprintf to generate text 
output. *Don't* do that. Use binary buffers and translate them to text 
off-line in user-mode. sprintf is awfully inefficient for large amounts 
of data.

Baruch
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