linux-kernel - Re: [PATCH v5 10/14] perf tools: Enable indices setting syntax for BPF maps

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Date:	Wed, 16 Dec 2015 12:24:56 +0100
From:	Jiri Olsa <jolsa@...hat.com>
To:	Wang Nan <wangnan0@...wei.com>
Cc:	acme@...nel.org, masami.hiramatsu.pt@...achi.com, jolsa@...nel.org,
	linux-kernel@...r.kernel.org, pi3orama@....com, lizefan@...wei.com,
	Alexei Starovoitov <ast@...nel.org>,
	Arnaldo Carvalho de Melo <acme@...hat.com>,
	Namhyung Kim <namhyung@...nel.org>
Subject: Re: [PATCH v5 10/14] perf tools: Enable indices setting syntax for
 BPF maps

On Mon, Dec 14, 2015 at 10:39:19AM +0000, Wang Nan wrote:

SNIP

>  # cat /sys/kernel/debug/tracing/trace | grep usleep
>            usleep-405   [004] d... 2745423.547822: : 101
>            usleep-655   [006] d... 2745434.122814: : 102
>            usleep-904   [006] d... 2745439.916264: : 103
>  # ./perf record -e './test_bpf_map_3.c/maps:channel.value[all]=104/' usleep 99
>  # cat /sys/kernel/debug/tracing/trace | grep usleep
>            usleep-405   [004] d... 2745423.547822: : 101
>            usleep-655   [006] d... 2745434.122814: : 102
>            usleep-904   [006] d... 2745439.916264: : 103
>            usleep-1537  [003] d... 2745538.053737: : 104
> 
> Error case:
>  # ./perf record -e './test_bpf_map_3.c/maps:channel.value[10...1000]=104/' usleep 99
>  event syntax error: '..annel.value[10...1000]=104/'
>                                    \___ Index too large
>  Hint:	Valid config terms:
>       	maps:[<arraymap>].value<indices>=[value]
>       	maps:[<eventmap>].event<indices>=[event]
> 
>       	where <indices> is something like [0,3...5] or [all]
>       	(add -v to see detail)
>  Run 'perf list' for a list of valid events
> 
>   Usage: perf record [<options>] [<command>]
>      or: perf record [<options>] -- <command> [<options>]
> 
>      -e, --event <event>   event selector. use 'perf list' to list available events
> 
> Signed-off-by: Wang Nan <wangnan0@...wei.com>
> Cc: Alexei Starovoitov <ast@...nel.org>
> Cc: Arnaldo Carvalho de Melo <acme@...hat.com>
> Cc: Jiri Olsa <jolsa@...nel.org>
> Cc: Masami Hiramatsu <masami.hiramatsu.pt@...achi.com>
> Cc: Namhyung Kim <namhyung@...nel.org>
> Cc: Zefan Li <lizefan@...wei.com>
> Cc: pi3orama@....com
> ---
>  tools/perf/util/parse-events.c |  5 ++-
>  tools/perf/util/parse-events.l | 13 ++++++-
>  tools/perf/util/parse-events.y | 85 ++++++++++++++++++++++++++++++++++++++++++

Acked-by: Jiri Olsa <jolsa@...nel.org>

thanks,
jirka
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