linux-kernel - Re: [PATCH] perf: Support for Openembedded/Yocto -dbg packages

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Date:	Wed, 18 Sep 2013 11:47:11 +0200
From:	Ricardo Ribalda Delgado <ricardo.ribalda@...il.com>
To:	Ingo Molnar <mingo@...nel.org>
Cc:	Peter Zijlstra <a.p.zijlstra@...llo.nl>,
	Paul Mackerras <paulus@...ba.org>,
	Ingo Molnar <mingo@...hat.com>,
	Arnaldo Carvalho de Melo <acme@...stprotocols.net>,
	Namhyung Kim <namhyung@...nel.org>,
	Waiman Long <Waiman.Long@...com>,
	Stephane Eranian <eranian@...gle.com>,
	Jiri Olsa <jolsa@...hat.com>, David Ahern <dsahern@...il.com>,
	LKML <linux-kernel@...r.kernel.org>
Subject: Re: [PATCH] perf: Support for Openembedded/Yocto -dbg packages

Hello Ingo

Incredible how many code style rules I can break in 20 lines of code
:). I have just uploaded v2

Thanks for your comments.

On Wed, Sep 18, 2013 at 11:24 AM, Ingo Molnar <mingo@...nel.org> wrote:
>
> * Ricardo Ribalda Delgado <ricardo.ribalda@...il.com> wrote:
>
>> On OpenEmbedded the symbol files are located under a .debug folder on
>> the same folder as the binary file.
>>
>> This patch adds support for such files.
>
> It would be nice to cite before/after perf report output, to see how this
> improved things and to see the output format you picked.
>
>>
>> Signed-off-by: Ricardo Ribalda Delgado <ricardo.ribalda@...il.com>
>> ---
>>  tools/perf/util/dso.c    | 16 ++++++++++++++++
>>  tools/perf/util/dso.h    |  1 +
>>  tools/perf/util/symbol.c |  1 +
>>  3 files changed, 18 insertions(+)
>>
>> diff --git a/tools/perf/util/dso.c b/tools/perf/util/dso.c
>> index c4374f0..bab18b7 100644
>> --- a/tools/perf/util/dso.c
>> +++ b/tools/perf/util/dso.c
>> @@ -14,6 +14,7 @@ char dso__symtab_origin(const struct dso *dso)
>>               [DSO_BINARY_TYPE__BUILD_ID_CACHE]       = 'B',
>>               [DSO_BINARY_TYPE__FEDORA_DEBUGINFO]     = 'f',
>>               [DSO_BINARY_TYPE__UBUNTU_DEBUGINFO]     = 'u',
>> +             [DSO_BINARY_TYPE__OPENEMBEDDED_DEBUGINFO] = 'o',
>>               [DSO_BINARY_TYPE__BUILDID_DEBUGINFO]    = 'b',
>>               [DSO_BINARY_TYPE__SYSTEM_PATH_DSO]      = 'd',
>>               [DSO_BINARY_TYPE__SYSTEM_PATH_KMODULE]  = 'K',
>
> Stylistic nit: if a new entry breaks vertical alignment then re-align the
> other entries as well so that it still looks nice after your change ...
>
>> @@ -64,6 +65,21 @@ int dso__binary_type_file(struct dso *dso, enum dso_binary_type type,
>>                        symbol_conf.symfs, dso->long_name);
>>               break;
>>
>> +     case DSO_BINARY_TYPE__OPENEMBEDDED_DEBUGINFO:{
>
> /: {
>
>> +             char *last_slash;
>> +
>> +             last_slash = dso->long_name + dso->long_name_len;
>> +             while (last_slash != dso->long_name && *last_slash != '/')
>> +                     last_slash--;
>> +
>> +             snprintf(file, MIN(size, strlen(symbol_conf.symfs) +
>> +                             (last_slash - dso->long_name) + 2), "%s%s",
>> +                             symbol_conf.symfs, dso->long_name);
>> +             snprintf(file + strlen(file), size-strlen(file), ".debug%s",
>> +                             last_slash);
>
> So the way such multi-snprintf() sequences are implemented in the kernel
> is not this unreadable, fragile, repetitive concatenation of length
> calculations, but an adjustment of 'size':
>
>                 size -= snprintf(..., size, ...);
>
> that way 'size' always tracks the remaining limit of the output string,
> each snprintf consumes from it.
>
>> +             }
>> +             break;
>
> Small nit: we generally put the final break inside the block.
>
> Besides the details it looks like a useful patch.
>
> Thanks,
>
>         Ingo



-- 
Ricardo Ribalda
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