linux-kernel - Re: [PATCH V3 11/25] perf record: Add AUX area tracing Snapshot Mode support

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Date:	Tue, 28 Apr 2015 15:24:46 +0200
From:	Jiri Olsa <jolsa@...hat.com>
To:	Adrian Hunter <adrian.hunter@...el.com>
Cc:	Arnaldo Carvalho de Melo <acme@...nel.org>,
	Peter Zijlstra <peterz@...radead.org>,
	linux-kernel@...r.kernel.org, David Ahern <dsahern@...il.com>,
	Frederic Weisbecker <fweisbec@...il.com>,
	Namhyung Kim <namhyung@...il.com>,
	Stephane Eranian <eranian@...gle.com>
Subject: Re: [PATCH V3 11/25] perf record: Add AUX area tracing Snapshot Mode
 support

On Fri, Apr 24, 2015 at 10:29:53PM +0300, Adrian Hunter wrote:

SNIP

>  	char msg[512];
> @@ -238,7 +302,8 @@ try_again:
>  	}
>  
>  	if (perf_evlist__mmap_ex(evlist, opts->mmap_pages, false,
> -				 opts->auxtrace_mmap_pages, false) < 0) {
> +				 opts->auxtrace_mmap_pages,
> +				 opts->auxtrace_snapshot_mode) < 0) {
>  		if (errno == EPERM) {
>  			pr_err("Permission error mapping pages.\n"
>  			       "Consider increasing "
> @@ -349,7 +414,7 @@ static int record__mmap_read_all(struct record *rec)
>  			}
>  		}
>  
> -		if (mm->base &&
> +		if (mm->base && !rec->opts.auxtrace_snapshot_mode &&
>  		    record__auxtrace_mmap_read(rec, mm) != 0) {
>  			rc = -1;
>  			goto out;
> @@ -404,6 +469,8 @@ static void workload_exec_failed_signal(int signo __maybe_unused,
>  	child_finished = 1;
>  }
>  
> +static void snapshot_sig_handler(int sig);

seems there's no need for forward declaration,
you can define the function right here, no?

jirka
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