linux-kernel - Re: [RFC PATCH tip 0/5] tracing filters with BPF

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Date:	Thu, 05 Dec 2013 11:11:57 -0500
From:	fche@...hat.com (Frank Ch. Eigler)
To:	Alexei Starovoitov <ast@...mgrid.com>
Cc:	Andi Kleen <andi@...stfloor.org>, Ingo Molnar <mingo@...nel.org>,
	Steven Rostedt <rostedt@...dmis.org>,
	Peter Zijlstra <a.p.zijlstra@...llo.nl>,
	"H. Peter Anvin" <hpa@...or.com>,
	Thomas Gleixner <tglx@...utronix.de>,
	Masami Hiramatsu <masami.hiramatsu.pt@...achi.com>,
	Tom Zanussi <tom.zanussi@...ux.intel.com>,
	Jovi Zhangwei <jovi.zhangwei@...il.com>,
	Eric Dumazet <edumazet@...gle.com>,
	linux-kernel@...r.kernel.org
Subject: Re: [RFC PATCH tip 0/5] tracing filters with BPF


ast wrote:

>>[...]
> Did simple ktap test with 1M alloc_skb/kfree_skb toy test from earlier email:
> trace skb:kfree_skb {
>         if (arg2 == 0x100) {
>                 printf("%x %x\n", arg1, arg2)
>         }
> }
> [...]

For reference, you might try putting systemtap into the performance
comparison matrix too:

# stap -e 'probe kernel.trace("kfree_skb") { 
              if ($location == 0x100 /* || $location == 0x200 etc. */ ) {
                 printf("%x %x\n", $skb, $location)
              }
           }'


- FChE
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