linux-kernel - Re: [PATCH v3] perf tools: Add symfs option for off-box analysis using specified tree

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Message-ID: <20101214122428.GA13425@ghostprotocols.net>
Date:	Tue, 14 Dec 2010 10:24:28 -0200
From:	Arnaldo Carvalho de Melo <acme@...stprotocols.net>
To:	David Ahern <daahern@...co.com>
Cc:	linux-perf-users@...r.kernel.org, linux-kernel@...r.kernel.org
Subject: Re: [PATCH v3] perf tools: Add symfs option for off-box analysis
 using specified tree

Em Thu, Dec 09, 2010 at 01:27:07PM -0700, David Ahern escreveu:
> The symfs argument allows analysis of perf.data file using a locally
> accessible filesystem tree with debug symbols - e.g., tree created
> during image builds, sshfs mount, loop mounted KVM disk images,
> USB keys, initrds, etc. Anything with an OS tree can be analyzed from
> anywhere without the need to populate a local data store with
> build-ids.
> 
> Signed-off-by: David Ahern <daahern@...co.com>
> 
> v2 --> v3: handle symfs="/"

> @@ -2312,6 +2332,13 @@ int symbol__init(void)
>  		       symbol_conf.sym_list_str, "symbol") < 0)
>  		goto out_free_comm_list;
>  
> +	/* a path to symbols of "/" is identical to "" 
> +	 * reset here for simplicity.
> +	 */
> +	if ((symbol_conf.symfs[0] == '/') &&
> +	    (symbol_conf.symfs[1] == '\0'))
> +		symbol_conf.symfs = "";
> +
>  	symbol_conf.initialized = true;
>  	return 0;
>  

Call me a nitpicker:

[acme@...icio ~]$ cat realpath.c 
#include <limits.h>
#include <stdlib.h>

int main(int argc, char *argv[])
{
	char *resolved = realpath(argv[1], NULL);

	puts(resolved);
}
[acme@...icio ~]$ make realpath
cc     realpath.c   -o realpath
[acme@...icio ~]$ ./realpath //
/
[acme@...icio ~]$ ./realpath ////////////////
/
[acme@...icio ~]$ ./realpath /./././
/
[acme@...icio ~]$ ./realpath /..//.
/
[acme@...icio ~]$

I'll fix this up and merge, thanks!

- Arnaldo
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