linux-kernel - Re: perf: store and retrieve trace event names in the perf.data file

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Message-Id: <1249897805.17467.77.camel@twins>
Date:	Mon, 10 Aug 2009 11:50:05 +0200
From:	Peter Zijlstra <peterz@...radead.org>
To:	Arjan van de Ven <arjan@...ux.intel.com>
Cc:	Ingo Molnar <mingo@...e.hu>,
	Linux Kernel Mailing List <linux-kernel@...r.kernel.org>
Subject: Re: perf: store and retrieve trace event names in the perf.data
 file

Thanks for the CC :-)

On Sun, 2009-08-09 at 14:49 -0700, Arjan van de Ven wrote:
> +static void store_event_type(const char *orgname)
> +{
> +       char filename[PATH_MAX], *c;
> +       FILE *file;
> +       int id;
> +
> +       sprintf(filename, "/sys/kernel/debug/tracing/events/%s/id", orgname);

That should be using debugfs_path, as it stands this thing won't work on
any of my machines.

> +       c = strchr(filename, ':');
> +       if (c) *c = '/';
> +
> +       file = fopen(filename, "r");
> +       if (!file)
> +               return;
> +       fscanf(file, "%i", &id);
> +       fclose(file);
> +       perf_header__push_event(id, orgname);
> +}
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