linux-kernel - Re: [PATCH 07/13] perf evlist: Fix creation of cpu map

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Date:	Thu, 26 Apr 2012 09:05:23 -0600
From:	David Ahern <dsahern@...il.com>
To:	Namhyung Kim <namhyung.kim@....com>
CC:	Arnaldo Carvalho de Melo <acme@...stprotocols.net>,
	Peter Zijlstra <a.p.zijlstra@...llo.nl>,
	Paul Mackerras <paulus@...ba.org>,
	Ingo Molnar <mingo@...hat.com>,
	Namhyung Kim <namhyung@...il.com>,
	LKML <linux-kernel@...r.kernel.org>
Subject: Re: [PATCH 07/13] perf evlist: Fix creation of cpu map

On 4/25/12 11:15 PM, Namhyung Kim wrote:
> Currently, 'perf record -- sleep 1' creates a cpu map for all online
> cpus since it turns out calling cpu_map__new(NULL). Fix it. Also it
> is guaranteed that cpu_list is NULL if PID/TID is given by calling
> perf_target__validate(), so we can make the conditional bit simpler.
>
> This also fixes perf test 7 (Validate) failure on my 6 core machine:
>
>    $ cat /sys/devices/system/cpu/online
>    0-11
>    $ ./perf test -v 7
>     7: Validate PERF_RECORD_* events&  perf_sample fields:
>    --- start ---
>    perf_evlist__mmap: Operation not permitted
>    ---- end ----
>    Validate PERF_RECORD_* events&  perf_sample fields: FAILED!

Works fine for me with latest tip:
$ cat /sys/devices/system/cpu/online
0-15

$ /tmp/perf/perf test -v 7
  7: Validate PERF_RECORD_* events & perf_sample fields:
--- start ---
64740167922229 0 PERF_RECORD_SAMPLE
64740167926354 0 PERF_RECORD_SAMPLE
64740167928389 0 PERF_RECORD_SAMPLE
64740167930832 0 PERF_RECORD_SAMPLE
64740168404145 0 PERF_RECORD_COMM: sleep:16523
64740168424672 0 PERF_RECORD_MMAP 16523/16523: [0x400000(0x6000) @ 0]: 
/bin/sleep
64740168441676 0 PERF_RECORD_MMAP 16523/16523: [0x7f83de5bb000(0x224000) 
@ 0]: /lib64/ld-2.14.90.so
64740168458460 0 PERF_RECORD_MMAP 16523/16523: [0x7fff009ff000(0x1000) @ 
0x7fff009ff000]: [vdso]
64740168586358 0 PERF_RECORD_MMAP 16523/16523: [0x7f83de203000(0x3b8000) 
@ 0]: /lib64/libc-2.14.90.so
64741168625653 0 PERF_RECORD_EXIT(16523:16523):(16523:16523)
---- end ----
Validate PERF_RECORD_* events & perf_sample fields: Ok

Is the failure a by-product of the other patches in this set?

David

>
> Signed-off-by: Namhyung Kim<namhyung.kim@....com>
> ---
>   tools/perf/util/evlist.c |    5 +++--
>   1 file changed, 3 insertions(+), 2 deletions(-)
>
> diff --git a/tools/perf/util/evlist.c b/tools/perf/util/evlist.c
> index a43e2c56d1c6..556d98af1a0b 100644
> --- a/tools/perf/util/evlist.c
> +++ b/tools/perf/util/evlist.c
> @@ -608,8 +608,9 @@ int perf_evlist__create_maps(struct perf_evlist *evlist,
>   	if (evlist->threads == NULL)
>   		return -1;
>
> -	if (target->uid != UINT_MAX ||
> -	    (target->cpu_list == NULL&&  target->tid))
> +	if (target->uid != UINT_MAX || target->tid)
> +		evlist->cpus = cpu_map__dummy_new();
> +	else if (!target->system_wide&&  target->cpu_list == NULL)
>   		evlist->cpus = cpu_map__dummy_new();
>   	else
>   		evlist->cpus = cpu_map__new(target->cpu_list);

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