Re: [RFC][PATCH 0/4] ftrace: Use -mfentry when supported (this isfor x86_64 right now)

[Masami Hiramatsu]

(2011/02/18 5:11), Steven Rostedt wrote:
> On Fri, 2011-02-18 at 01:07 +0900, Masami Hiramatsu wrote:
> 
>> I just thought that frequent stop-machine is not so good from the user's
>> POV. I agree that disabled probe ignoring the call is enough.
>> Maybe, it could be done with the similar mechanism of jump optimization.
> 
> I thought jump optimization still calls stop_machine too?

Yes, but now it does batch optimization.
Even if hundreds kprobes are registered separately, jump optimization
has been done in background with a stop_machine per every 256 probes.
(Until optimizing, kprobes can use breakpoints instead)

Thank you,

-- 
Masami HIRAMATSU
2nd Dept. Linux Technology Center
Hitachi, Ltd., Systems Development Laboratory
E-mail: masami.hiramatsu.pt@xxxxxxxxxxx
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