linux-kernel - Re: [PATCH v2 4/4] perf: Support perf -vv

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Date:   Wed, 28 Mar 2018 15:22:52 +0200
From:   Jiri Olsa <jolsa@...hat.com>
To:     Jin Yao <yao.jin@...ux.intel.com>
Cc:     acme@...nel.org, jolsa@...nel.org, peterz@...radead.org,
        mingo@...hat.com, alexander.shishkin@...ux.intel.com,
        Linux-kernel@...r.kernel.org, ak@...ux.intel.com,
        kan.liang@...el.com, yao.jin@...el.com
Subject: Re: [PATCH v2 4/4] perf: Support perf -vv

On Wed, Mar 28, 2018 at 10:57:08PM +0800, Jin Yao wrote:
> We keep having bug reports that when users build perf on their own,
> but they don't install some needed libraries such as libelf,
> libbfd/libibery.
> 
> The perf can build, but it is missing important functionality.
> 
> This patch provides a new option '-vv' which will print the
> compiled-in status of libraries.
> 
> The 'perf -vv' is equal to 'perf -version --build-options'.
> 
> For example:
> 
> $ ./perf -vv or ./perf -version --build-options
> perf version 4.13.rc5.gcb1183
>                  dwarf: [ on  ]
>     dwarf_getlocations: [ on  ]
>                  glibc: [ on  ]
>                   gtk2: [ on  ]
>               libaudit: [ OFF ]
>                 libbfd: [ on  ]
>                 libelf: [ on  ]
>                libnuma: [ on  ]
> numa_num_possible_cpus: [ on  ]
>                libperl: [ on  ]
>              libpython: [ on  ]
>               libslang: [ on  ]
>              libcrypto: [ on  ]
>              libunwind: [ on  ]
>     libdw-dwarf-unwind: [ on  ]
>                   zlib: [ on  ]
>                   lzma: [ on  ]
>              get_cpuid: [ on  ]
>                    bpf: [ on  ]
> [ on  ]: library is compiled-in
> [ OFF ]: library is disabled in make configuration
>          OR library is not installed in build environment
> 
> v2:
> ---
> Use a global variable version_verbose to count the number of 'v'.
> 
> Signed-off-by: Jin Yao <yao.jin@...ux.intel.com>
> ---
>  tools/perf/perf.c | 22 ++++++++++++++++++----
>  tools/perf/perf.h |  1 +
>  2 files changed, 19 insertions(+), 4 deletions(-)
> 
> diff --git a/tools/perf/perf.c b/tools/perf/perf.c
> index 1b3fc8e..355219e 100644
> --- a/tools/perf/perf.c
> +++ b/tools/perf/perf.c
> @@ -32,7 +32,7 @@
>  #include <linux/kernel.h>
>  
>  const char perf_usage_string[] =
> -	"perf [--version] [--help] [OPTIONS] COMMAND [ARGS]";
> +	"perf [--version [--build-options]] [--help] [OPTIONS] COMMAND [ARGS]";

--build-options is 'perf version' option no?

jirka