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

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Message-ID: <20150429152314.GD7822@krava.redhat.com>
Date:	Wed, 29 Apr 2015 17:23:14 +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 Wed, Apr 29, 2015 at 04:14:37PM +0300, Adrian Hunter wrote:
> On 28/04/15 16:24, Jiri Olsa wrote:
> > 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?
> 
> snapshot_sig_handler is dependent on "record" so the forward
> declaration does seem to be needed.

missed the record bit, ok

jirka
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