linux-kernel - Re: [PATCH -tip v2 3/6] perf script: resolve DSOs and symbols for user-space

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Date:	Sun, 17 Jul 2011 10:20:42 -0600
From:	David Ahern <dsahern@...il.com>
To:	Akihiro Nagai <akihiro.nagai.hw@...achi.com>
CC:	Arnaldo Carvalho de Melo <acme@...radead.org>,
	Ingo Molnar <mingo@...e.hu>,
	Peter Zijlstra <peterz@...radead.org>,
	Frederic Weisbecker <fweisbec@...il.com>,
	linux-kernel@...r.kernel.org,
	Masami Hiramatsu <masami.hiramatsu.pt@...achi.com>,
	yrl.pp-manager.tt@...achi.com, Paul Mackerras <paulus@...ba.org>
Subject: Re: [PATCH -tip v2 3/6] perf script: resolve DSOs and symbols for
 user-space

On 07/17/2011 03:30 AM, Akihiro Nagai wrote:
> Resolve user-space DSOs and symbols.
> Latest perf-script can resolve DSOs and symbols for only kernel
> and kernel modules. This patch resolves them for other
> executable binaries.

The description is a bit misleading. perf script does resolve symbols
for userspace. e.g., the example in the bug fix I submitted in May:
https://lkml.org/lkml/2011/5/30/223

Do you look into why the cpumode setting is not working that you have to
try specific settings?

David


> 
> # perf script -f ip,addr,sym,dso
> 3f03e016b0 ffffffff814675d2 irq_return ([kernel.kallsyms])
> 3f03e016b0 ffffffff814675d2 irq_return ([kernel.kallsyms])
> 3f03e04b80       3f03e016b3 _start (/lib64/ld-2.14.so)
> 3f03e04b80 ffffffff814675d2 irq_return ([kernel.kallsyms])
> 3f03e04ba6 ffffffff814675d2 irq_return ([kernel.kallsyms])
> 3f03e04bad ffffffff814675d2 irq_return ([kernel.kallsyms])
> 3f03e04c1d       3f03e04bfb _dl_start (/lib64/ld-2.14.so)
> 3f03e04c00       3f03e04c21 _dl_start (/lib64/ld-2.14.so)
> 3f03e04c00       3f03e04c21 _dl_start (/lib64/ld-2.14.so)
> [snip]
> 
> Signed-off-by: Akihiro Nagai <akihiro.nagai.hw@...achi.com>
> Cc: Peter Zijlstra <peterz@...radead.org>
> Cc: Frederic Weisbecker <fweisbec@...il.com>
> Cc: Paul Mackerras <paulus@...ba.org>
> Cc: Ingo Molnar <mingo@...e.hu>
> Cc: Arnaldo Carvalho de Melo <acme@...radead.org>
> Cc: David Ahern <dsahern@...il.com>
> Cc: Masami Hiramatsu <masami.hiramatsu.pt@...achi.com>
> ---
> 
>  tools/perf/builtin-script.c |    4 ++++
>  tools/perf/util/event.c     |    5 +++++
>  2 files changed, 9 insertions(+), 0 deletions(-)
> 
> diff --git a/tools/perf/builtin-script.c b/tools/perf/builtin-script.c
> index b3e0951..2356198 100644
> --- a/tools/perf/builtin-script.c
> +++ b/tools/perf/builtin-script.c
> @@ -328,6 +328,10 @@ static void print_sample_addr(union perf_event *event,
>  
>  	thread__find_addr_map(thread, session, cpumode, MAP__FUNCTION,
>  			      event->ip.pid, sample->addr, &al);
> +	/* try to resolve for user space */
> +	if (!al.map)
> +		thread__find_addr_map(thread, session, PERF_RECORD_MISC_USER,
> +			MAP__FUNCTION, event->ip.pid, sample->addr, &al);
>  	if (!al.map)
>  		thread__find_addr_map(thread, session, cpumode, MAP__VARIABLE,
>  				      event->ip.pid, sample->addr, &al);
> diff --git a/tools/perf/util/event.c b/tools/perf/util/event.c
> index 3c1b8a6..49a9315 100644
> --- a/tools/perf/util/event.c
> +++ b/tools/perf/util/event.c
> @@ -771,6 +771,11 @@ int perf_event__preprocess_sample(const union perf_event *event,
>  
>  	thread__find_addr_map(thread, session, cpumode, MAP__FUNCTION,
>  			      event->ip.pid, event->ip.ip, al);
> +	/* try to resolve for user space */
> +	if (!al->map)
> +		thread__find_addr_map(thread, session, PERF_RECORD_MISC_USER,
> +				MAP__FUNCTION, event->ip.pid, event->ip.ip, al);
> +
>  	dump_printf(" ...... dso: %s\n",
>  		    al->map ? al->map->dso->long_name :
>  			al->level == 'H' ? "[hypervisor]" : "<not found>");
> 
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