linux-kernel - Re: ktap and ebpf integration

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Message-ID: <20140405175059.GT22728@two.firstfloor.org>
Date:	Sat, 5 Apr 2014 19:50:59 +0200
From:	Andi Kleen <andi@...stfloor.org>
To:	Jovi Zhangwei <jovi.zhangwei@...il.com>
Cc:	Alexei Starovoitov <ast@...mgrid.com>,
	Ingo Molnar <mingo@...nel.org>, Ingo Molnar <mingo@...hat.com>,
	Steven Rostedt <rostedt@...dmis.org>,
	Masami Hiramatsu <masami.hiramatsu.pt@...achi.com>,
	Greg KH <gregkh@...uxfoundation.org>,
	Andi Kleen <andi@...stfloor.org>,
	LKML <linux-kernel@...r.kernel.org>
Subject: Re: ktap and ebpf integration

> 4) var i = 0; trace *:* { i += 1}
> Assign global variable in here, there also can assign other
> value not 0, please show me how BPF do this.
> (See complex global usage example in samples/schedule/schedtimes.kp)

That's what I meant. BPF is essentially a statically typed
language. KTAP is dynamically typed. It's a very different
model.

Yes they are both Turing complete and likely could 
be somehow translated into each other, but would
it be efficient and simple? No.

[essentially it's the "UNCOL problem" -- see
http://en.wikipedia.org/wiki/UNCOL
One size doesn't fit all in immediate languages]

-Andi

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