[Bug kprobes/10869] kretprobes waste a lot of memory on kretprobe_instances

[Jim Keniston]

Quoting ananth at in dot ibm dot com <sourceware-bugzilla@sourceware.org>:

>
> ------- Additional Comments From ananth at in dot ibm dot com    
> 2009-10-30 07:29 -------
> Created an attachment (id=4344)
>  --> (http://sourceware.org/bugzilla/attachment.cgi?id=4344&action=view)
> Be smarter in allocating kretprobe instances
>
> All along, kretprobes would allocate NR_CPU kretprobe_instance   
> structures. Use
> a more logical num_possible_cpus() instead.
>
> If this patch is acceptable, I'll post it upstream.
>
> Jim, Masami?
>
> --
>
>
> http://sourceware.org/bugzilla/show_bug.cgi?id=10869
>
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Looks good to me.

While you're in that code... the default maxactive for  
non-preemptable, non-SMP systems is (still) 1.  That's always felt  
pretty uncomfortable.  But that's a different discussion, and  
presumably a different patch.