linux-kernel - Re: [PATCH] tools lib traceevent: Add support for IP address formats

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Date:	Thu, 18 Dec 2014 18:41:58 -0700
From:	David Ahern <dsahern@...il.com>
To:	Valdis.Kletnieks@...edu
CC:	acme@...nel.org, linux-kernel@...r.kernel.org,
	Namhyung Kim <namhyung@...nel.org>,
	Jiri Olsa <jolsa@...nel.org>,
	Steven Rostedt <rostedt@...dmis.org>
Subject: Re: [PATCH] tools lib traceevent: Add support for IP address formats

On 12/18/14 3:13 PM, David Ahern wrote:
> Are you seeing something different?

I put a tracepoint in the ipv4/ipv6 add/del address code. The IPv4 one 
prints the address using pi4 and pI4 and the IPv6 using pi6, pI6 and pI6c.

Using ifconfig eth1 1.2.3.4/24

I get this for trace_pipe which uses the in-kernel printf code:

root@...alhost:/sys/kernel/debug/tracing/events# cat ../trace_pipe
         ifconfig-601   [000] ....   710.660611: ipv4_del_addr: 
pI4=1.2.3.4 pi4=001.002.003.004
         ifconfig-602   [000] ....   720.833559: ipv4_add_addr: 
pI4=1.2.3.4 pi4=001.002.003.004
         ifconfig-602   [000] .Ns.   720.833966: ipv6_add_addr: 
pi6=fe80000000000000000202fffe020211 
pI6=fe80:0000:0000:0000:0002:02ff:fe02:0211 pI6c=fe80::2:2ff:fe02:211
         ifconfig-602   [000] ....   720.835413: ipv4_del_addr: 
pI4=1.2.3.4 pi4=001.002.003.004
         ifconfig-602   [000] .N..   720.835451: ipv4_add_addr: 
pI4=1.2.3.4 pi4=001.002.003.004


And this using perf:
root@...alhost:~# perf record -a -e  ipv4:* -e ipv6:* --no-buffering | 
perf --no-pager script

        ifconfig   601 [000]   710.912862: ipv4:ipv4_del_addr: 
pI4=1.2.3.4 pi4=001.002.003.004
         ifconfig   602 [000]   721.090776: ipv4:ipv4_add_addr: 
pI4=1.2.3.4 pi4=001.002.003.004
         ifconfig   602 [000]   721.091177: ipv6:ipv6_add_addr: 
pi6=fe80000000000000000202fffe020211 
pI6=fe80:0000:0000:0000:0002:02ff:fe02:0211 pI6c=fe80::2:2ff:fe02:211
         ifconfig   602 [000]   721.092626: ipv4:ipv4_del_addr: 
pI4=1.2.3.4 pi4=001.002.003.004
         ifconfig   602 [000]   721.092648: ipv4:ipv4_add_addr: 
pI4=1.2.3.4 pi4=001.002.003.004

(Don't be fooled by the differing timestamps; data collected from both 
using the same exact command. timestamp differences are perf vs tracing.)

which suggest with the patch perf output matches tracing.

David

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