linux-kernel - Re: [PATCH 1/2] perf probe: Improve error message when function not found

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Date:	Mon, 02 Dec 2013 14:59:33 +0900
From:	Masami Hiramatsu <masami.hiramatsu.pt@...achi.com>
To:	David Ahern <dsahern@...il.com>
Cc:	acme@...stprotocols.net, linux-kernel@...r.kernel.org,
	Srikar Dronamraju <srikar@...ux.vnet.ibm.com>,
	"yrl.pp-manager.tt@...achi.com" <yrl.pp-manager.tt@...achi.com>
Subject: Re: [PATCH 1/2] perf probe: Improve error message when function not
 found

(2013/12/02 9:07), David Ahern wrote:
> When requesting a function from a userspace library the error message to
> the user is less than helpful. e.g.,
> 
>     perf probe -x /lib64/libpthread-2.14.90.so -a 'lock_full=__pthread_mutex_lock_full'
>     no symbols found in /lib64/libpthread-2.14.90.so, maybe install a debug package?
>     Failed to load map.
>        Error: Failed to add events. (-22)
> 
> In this cae the symbol really does exist but is a local symbol which is
> filtered:
> 
>     nm /lib64/libpthread-2.14.90.so | grep __pthread_mutex_lock_full
>     0000000000005700 t __pthread_mutex_lock_full
> 
> With this patch:
>     perf probe -x /lib64/libpthread-2.14.90.so -a 'lock_full=__pthread_mutex_lock_full'
> 
>     no symbols found in /lib64/libpthread-2.14.90.so, maybe install a debug package?
>     Failed to find function in /lib64/libpthread-2.14.90.so. Perhaps it is a local variable?

Hmm, indeed current message is too less information, but your message looks
wired. I think just showing "Failed to find requested symbol in %s" is enough. :)

Thank you,

-- 
Masami HIRAMATSU
IT Management Research Dept. Linux Technology Center
Hitachi, Ltd., Yokohama Research Laboratory
E-mail: masami.hiramatsu.pt@...achi.com


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