linux-kernel - Re: how to use perf annotate on the kernel

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Message-ID: <20100603181103.GB10469@ghostprotocols.net>
Date:	Thu, 3 Jun 2010 15:11:03 -0300
From:	Arnaldo Carvalho de Melo <acme@...radead.org>
To:	Stephane Eranian <eranian@...gle.com>
Cc:	linux-kernel@...r.kernel.org, peterz@...radead.org, mingo@...e.hu,
	paulus@...ba.org, davem@...emloft.net, fweisbec@...il.com,
	perfmon2-devel@...ts.sf.net, eranian@...il.com, tzanussi@...il.com
Subject: Re: how to use perf annotate on the kernel

Em Thu, Jun 03, 2010 at 03:06:13PM -0300, Arnaldo Carvalho de Melo escreveu:
> For instance, here using -vvv I get:
> 
> [root@...lia ~]# perf annotate -vvv memcpy > /dev/null
> build id event received for [kernel.kallsyms]: 310920b54cbbf242dbfa09052f652806d2c73821
> build id event received for /lib64/libtinfo.so.5.7: cd9da7b5b1fcb25ee6b3762bb9fe62f782590fd5
> Looking at the vmlinux_path (6 entries long)
> No build_id in /root/.debug/.build-id/31/0920b54cbbf242dbfa09052f652806d2c73821, ignoring it
> No build_id in vmlinux, ignoring it
> No build_id in /boot/vmlinux, ignoring it
> No build_id in /boot/vmlinux-2.6.35-rc1, ignoring it
> Using /lib/modules/2.6.35-rc1/build/vmlinux for symbols
> hist_entry__inc_addr_samples: ip=0xffffffff811ea69e
> 0xffffffff811ea690 memcpy: period++ [ip: 0xffffffff811ea69e, 0xe] => 1
> hist_entry__annotate: filename=/lib/modules/2.6.35-rc1/build/vmlinux, sym=memcpy, start=0xffffffff811ea690, end=0xffffffff811ea730
> annotating [0x187e770] /lib/modules/2.6.35-rc1/build/vmlinux : [0x19b1f70]                         memcpy
> Executing: objdump --start-address=0xffffffff811ea690 --stop-address=0xffffffff811ea730 -dS /lib/modules/2.6.35-rc1/build/vmlinux|grep -v /lib/modules/2.6.35-rc1/build/vmlinux|expand
> [root@...lia ~]# 
> 
> I'm removing all vmlinux from the path so that I can reproduce what you see.

[root@...lia ~]# mv /lib/modules/2.6.35-rc1/build/vmlinux /lib/modules/2.6.35-rc1/build/vmlinux.OFF
[root@...lia ~]# perf annotate -vvv memcpy > /dev/null
build id event received for [kernel.kallsyms]: 310920b54cbbf242dbfa09052f652806d2c73821
build id event received for /lib64/libtinfo.so.5.7: cd9da7b5b1fcb25ee6b3762bb9fe62f782590fd5
Looking at the vmlinux_path (6 entries long)
No build_id in /root/.debug/.build-id/31/0920b54cbbf242dbfa09052f652806d2c73821, ignoring it
No build_id in vmlinux, ignoring it
No build_id in /boot/vmlinux, ignoring it
No build_id in /boot/vmlinux-2.6.35-rc1, ignoring it
No build_id in /lib/modules/2.6.35-rc1/build/vmlinux, ignoring it
No build_id in /usr/lib/debug/lib/modules/2.6.35-rc1/vmlinux, ignoring it
Using /proc/kallsyms for symbols
[root@...lia ~]# 
[root@...lia ~]# vi ~/.perfconfig
[root@...lia ~]# cat ~/.perfconfig
[tui]

	report = on
	annotate = off
[root@...lia ~]# perf annotate memcpy
[root@...lia ~]# perf annotate memcpy
[root@...lia ~]# perf annotate -k vmlinux memcpy
[kernel.kallsyms] with build id 310920b54cbbf242dbfa09052f652806d2c73821 not found, continuing without symbols

	Yeah, these error messages suckz, will work on having proper messages
for these cases :-\

- Arnaldo
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