linux-kernel - Re: [RFC PATCH v7 00/37] perf tools: filtering events using eBPF programs

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Date:	Tue, 16 Jun 2015 13:22:14 +0800
From:	"Wangnan (F)" <wangnan0@...wei.com>
To:	Alexei Starovoitov <ast@...mgrid.com>, <acme@...nel.org>,
	<brendan.d.gregg@...il.com>, <daniel@...earbox.net>,
	<namhyung@...nel.org>, <masami.hiramatsu.pt@...achi.com>,
	<paulus@...ba.org>, <a.p.zijlstra@...llo.nl>, <mingo@...hat.com>,
	<jolsa@...nel.org>, <dsahern@...il.com>
CC:	<linux-kernel@...r.kernel.org>, <lizefan@...wei.com>,
	<hekuang@...wei.com>, <xiakaixu@...wei.com>, <pi3orama@....com>
Subject: Re: [RFC PATCH v7 00/37] perf tools: filtering events using eBPF
 programs



On 2015/6/13 0:58, Alexei Starovoitov wrote:
>
> btw, what compile times do you see?
> On my machine compiling basic hello_world.c with #include bpf_helpers.h
> and few kernel headers take: 0.02 sec
> So using .c is quite instant. Feels like interpreted language ;)

Sorry I didn't see your question for several days.

It takes 1.63 seconds for perf to compile lock_page.c I posted in 
previous mail.
Most of the time is consumed by kernel include directories detection. If 
skip the
detector and passes options through cmdline, time reduced to 0.2 seconds. My
environment is a server equipped with Intel Xeon 2.4G cores. However the 
storage
is NFS based.

Thank you.


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