linux-kernel - Re: [PATCH v1] perf record: Add an option to take an AUX snapshot on exit

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Date:   Tue, 13 Aug 2019 12:33:30 -0300
From:   Arnaldo Carvalho de Melo <acme@...hat.com>
To:     Alexander Shishkin <alexander.shishkin@...ux.intel.com>
Cc:     Peter Zijlstra <a.p.zijlstra@...llo.nl>,
        Ingo Molnar <mingo@...hat.com>, linux-kernel@...r.kernel.org,
        Adrian Hunter <adrian.hunter@...el.com>, acme@...nel.org
Subject: Re: [PATCH v1] perf record: Add an option to take an AUX snapshot on
 exit

Em Tue, Aug 06, 2019 at 05:41:01PM +0300, Alexander Shishkin escreveu:
> It is sometimes useful to generate a snapshot when perf record exits;
> I've been using a wrapper script around the workload that would do a
> killall -USR2 perf when the workload exits.
> 
> @@ -654,7 +670,7 @@ int record__auxtrace_mmap_read(struct record *rec __maybe_unused,
>  }
>  
>  static inline
> -void record__read_auxtrace_snapshot(struct record *rec __maybe_unused)
> +void record__read_auxtrace_snapshot(struct record *rec __maybe_unused, bool on_exit)

You forgot to add the __maybe_unused for the on_exit and later for the
'rec' in record__auxtrace_snapshot_exit, which causes the build to fail
when auxtrace isn't being built, I've fixed those.

- Arnaldo

>  {
>  }
>  
> @@ -664,6 +680,12 @@ int auxtrace_record__snapshot_start(struct auxtrace_record *itr __maybe_unused)
>  	return 0;
>  }
>  
> +static inline
> +int record__auxtrace_snapshot_exit(struct record *rec)
> +{
> +	return 0;
> +}
> +
>  static int record__auxtrace_init(struct record *rec __maybe_unused)
>  {
>  	return 0;
> @@ -1536,7 +1558,7 @@ static int __cmd_record(struct record *rec, int argc, const char **argv)