Re: [PATCH tracing/kprobes] kprobes: Disable booster whenCONFIG_PREEMPT=y

[Peter Zijlstra]

On Fri, 2010-01-29 at 10:21 +0100, Ingo Molnar wrote:
> * Masami Hiramatsu <mhiramat@xxxxxxxxxx> wrote:
> 
> > Disable kprobe booster when CONFIG_PREEMPT=y, because it can't ensure that 
> > all kernel threads preempted on kprobe's boosted slot run out from the slot 
> > even using freeze_processes().
> 
> hm, this really sucks as it makes preemptible kernels perform worse. Is there 
> no better solution?

We could pre-allocate 1 slot per kernel thread.

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