linux-kernel - Re: why is perf-report asking for objdump path?

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Message-ID: <50933FFB.8060300@gmail.com>
Date:	Thu, 01 Nov 2012 21:37:31 -0600
From:	David Ahern <dsahern@...il.com>
To:	Namhyung Kim <namhyung@...nel.org>
CC:	Arnaldo Carvalho de Melo <acme@...stprotocols.net>,
	LKML <linux-kernel@...r.kernel.org>,
	Irina Tirdea <irina.tirdea@...il.com>
Subject: Re: why is perf-report asking for objdump path?

On 11/1/12 7:11 PM, Namhyung Kim wrote:
>  From f0a9d6303f83452c8b6f81081abae8fdf9c81778 Mon Sep 17 00:00:00 2001
> From: Namhyung Kim<namhyung.kim@....com>
> Date: Fri, 2 Nov 2012 09:48:17 +0900
> Subject: [PATCH] perf tools: Use normalized arch name for searching objdump
>   path
>
> David reported that perf report for i686 target data on x86_64 host
> failed to work because it tried to find out cross-compiled objdump.
>
> However objdump for x86_64 is compatible to i686 so that it doesn't
> need to do it at all.  To prevent similar artifacts, normalize arch
> name when comparing host and file architectures.
>

This fixes the i686 perf.data file analyzed on x86_64. I don't have time 
for the reverse - partly because I needed to verify my other point on 
this bug report: why does objdump path matter for non-annotate commands? 
Before this patch I can analyze 32-bit ppc files on x86 (an important 
use case on my end). After the objdump patch it fails -- or rather, I 
have to add the --objdump argument which is awkward. I don't want to 
have to educate users to add a non-sensical argument to perf-report (and 
other specialized commands).

David

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