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

From: Ingo Molnar
Date: Fri Jan 29 2010 - 04:22:12 EST



* 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?

> The booster on preemptive kernel will be resumed if synchronize_tasks() or
> something like that is introduced.

such as this one?

Ingo
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