linux-kernel - Re: [PATCHv2 1/2] perf tools: Collect tracing event data files directly

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Date:	Mon, 26 Sep 2011 16:56:06 +0200
From:	Jiri Olsa <jolsa@...hat.com>
To:	Steven Rostedt <rostedt@...dmis.org>
Cc:	acme@...hat.com, eric.dumazet@...il.com, fweisbec@...il.com,
	a.p.zijlstra@...llo.nl, mingo@...e.hu, paulus@...ba.org,
	linux-kernel@...r.kernel.org, nhorman@...driver.com
Subject: Re: [PATCHv2 1/2] perf tools: Collect tracing event data files
 directly

On Mon, Sep 26, 2011 at 09:36:31AM -0400, Steven Rostedt wrote:
> On Mon, 2011-09-26 at 11:11 +0200, Jiri Olsa wrote:
> > Changing the way the event files are searched by quering specified
> > event files directly, instead of walking the events directory.
> > 
> > Hopefully this way is more straightforward and faster.
> 
> Have you looked at my code I posted earlier that uses the libparsevents?
> 
> It uses globs such that you could do -e sched:sched* and it will enable
> all sched events.

ops, haven't seen those changes yet..
I think I can go only with 2/2 patch, if the 1/2 collides with your changes

I'll check, thanks
jirka

> 
> -- Steve
> 
> 
> 
> > +	 * and one safety byte ;)
> > +	 */
> > +	file = malloc_or_die(strlen(path) + strlen(sys) +
> > +			     strlen(name) + strlen("format") + 5);
> >  
> > -		free(format);
> > -	}
> > -	closedir(dir);
> > +	sprintf(file, "%s/%s/%s/format", path, sys, name);
> > +	return file;
> >  }
> >  
> > -static void read_ftrace_files(struct tracepoint_path *tps)
> > +static void put_format_file(char *file)
> >  {
> > -	char *path;
> > -
> > -	path = get_tracing_file("events/ftrace");
> > -
> > -	copy_event_system(path, tps);
> > -
> > -	put_tracing_file(path);
> > +	free(file);
> >  }
> >  
> > -static bool system_in_tp_list(char *sys, struct tracepoint_path *tps)
> > +/*
> > + * Walk tracepoint event objects and store them.
> > + * Only those matching the sys parameter are stored
> > + * and marked as done.
> > + */
> > +static void read_event_files_system(struct tracepoint_path *tps,
> > +				    const char *sys)
> >  {
> > +	off_t count_pos;
> > +	u32 count = 0;
> > +
> > +	/* Place for number of events under single system. */
> > +	count_pos = lseek(output_fd, 0, SEEK_CUR);
> > +	write_or_die(&count, 4);
> > +
> >  	while (tps) {
> > -		if (!strcmp(sys, tps->system))
> > -			return true;
> > +		if ((!tps->done) &&
> > +		    (!strcmp(sys, tps->system))) {
> > +			char *file;
> > +
> > +			file = get_format_file(tps->system, tps->name);
> > +			if (file) {
> > +				record_file(file, 8);
> > +				count++;
> > +			}
> > +
> > +			put_format_file(file);
> > +			tps->done = 1;
> > +		}
> > +
> >  		tps = tps->next;
> 
> 
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