lkml.org 
[lkml]   [2023]   [Nov]   [13]   [last100]   RSS Feed
Views: [wrap][no wrap]   [headers]  [forward] 
 
Messages in this thread
/
Date
SubjectRe: [PATCH 2/2] perf lock info: Enforce exactly one of --map and --thread
From

On 08/11/2023 20:28, Arnaldo Carvalho de Melo wrote:
> Em Wed, Nov 01, 2023 at 11:00:42PM -0700, Namhyung Kim escreveu:
>> On Wed, Nov 1, 2023 at 7:35 AM Nick Forrington <nick.forrington@arm.com> wrote:
>>>
>>> On 31/10/2023 15:38, Arnaldo Carvalho de Melo wrote:
>>>> Em Tue, Oct 31, 2023 at 12:05:25PM +0000, Nick Forrington escreveu:
>>>>> Improve error reporting for command line arguments.
>>>>>
>>>>> Display error/usage if neither --map or --thread are specified (rather
>>>>> than a non user-friendly error "Unknown type of information").
>>>>>
>>>>> Display error/usage if both --map and --thread are specified (rather
>>>>> than ignoring "--map" and displaying only thread information).
>>>> Shouldn't one of them be the default so that we type less for the most
>>>> common usage?
>>>>
>>>> - Arnaldo
>>>>
>>> There isn't an obvious choice (to me) for which would be the default.
>>>
>>> Both options display completely different data/outputs, so I think it
>>> makes sense to be explicit about which data is requested.
>> Maybe we can default to display both. :)
> Yeah, that would be a better approach, I think.
>
> - Arnaldo
>


I'll submit an updated series for this, with the next update to patch 1/2

Thanks,
Nick

>> Thanks,
>> Namhyung
>>
>>>
>>> An alternative could be to use sub-commands e.g. "perf lock info
>>> threads" or just "perf lock threads", although changing the existing
>>> options would be more disruptive.
>>>
>>>
>>> Cheers,
>>> Nick
>>>
>>>>> Signed-off-by: Nick Forrington <nick.forrington@arm.com>
>>>>> ---
>>>>> tools/perf/builtin-lock.c | 25 +++++++++++++++++++++++++
>>>>> 1 file changed, 25 insertions(+)
>>>>>
>>>>> diff --git a/tools/perf/builtin-lock.c b/tools/perf/builtin-lock.c
>>>>> index 3aa8ba5ad928..cf29f648d291 100644
>>>>> --- a/tools/perf/builtin-lock.c
>>>>> +++ b/tools/perf/builtin-lock.c
>>>>> @@ -2021,6 +2021,27 @@ static int check_lock_report_options(const struct option *options,
>>>>> return 0;
>>>>> }
>>>>>
>>>>> +static int check_lock_info_options(const struct option *options,
>>>>> + const char * const *usage)
>>>>> +{
>>>>> + if (!info_map && !info_threads) {
>>>>> + pr_err("Requires one of --map or --threads\n");
>>>>> + parse_options_usage(usage, options, "map", 0);
>>>>> + parse_options_usage(NULL, options, "threads", 0);
>>>>> + return -1;
>>>>> +
>>>>> + }
>>>>> +
>>>>> + if (info_map && info_threads) {
>>>>> + pr_err("Cannot show map and threads together\n");
>>>>> + parse_options_usage(usage, options, "map", 0);
>>>>> + parse_options_usage(NULL, options, "threads", 0);
>>>>> + return -1;
>>>>> + }
>>>>> +
>>>>> + return 0;
>>>>> +}
>>>>> +
>>>>> static int check_lock_contention_options(const struct option *options,
>>>>> const char * const *usage)
>>>>>
>>>>> @@ -2709,6 +2730,10 @@ int cmd_lock(int argc, const char **argv)
>>>>> if (argc)
>>>>> usage_with_options(info_usage, info_options);
>>>>> }
>>>>> +
>>>>> + if (check_lock_info_options(info_options, info_usage) < 0)
>>>>> + return -1;
>>>>> +
>>>>> /* recycling report_lock_ops */
>>>>> trace_handler = &report_lock_ops;
>>>>> rc = __cmd_report(true);
>>>>> --
>>>>> 2.42.0
>>>>>
>>>>>

\
 
 \ /
  Last update: 2023-11-20 13:57    [W:0.093 / U:0.016 seconds]
©2003-2020 Jasper Spaans|hosted at Digital Ocean and TransIP|Read the blog|Advertise on this site