linux-kernel - Re: [PATCH 1/9] perf, tools: Dont stop PMU parsing on alias parse error

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Message-ID: <20150811130736.GA1942@krava.brq.redhat.com>
Date:	Tue, 11 Aug 2015 15:07:36 +0200
From:	Jiri Olsa <jolsa@...hat.com>
To:	Andi Kleen <andi@...stfloor.org>
Cc:	acme@...nel.org, jolsa@...nel.org, linux-kernel@...r.kernel.org,
	eranian@...gle.com, namhyung@...nel.org, peterz@...radead.org,
	mingo@...nel.org, Andi Kleen <ak@...ux.intel.com>
Subject: Re: [PATCH 1/9] perf, tools: Dont stop PMU parsing on alias parse
 error

On Fri, Aug 07, 2015 at 06:06:17PM -0700, Andi Kleen wrote:
> From: Andi Kleen <ak@...ux.intel.com>
> 
> When an error happens during alias parsing currently the complete
> parsing of all attributes of the PMU is stopped. This is breaks
> old perf on a newer kernel that may have not-yet-know
> alias attributes (such as .scale or .per-pkg).

hum, both .scale and .per-pgk are skip from term parsing via:

                /*
                 * skip info files parsed in perf_pmu__new_alias()
                 */
                if (pmu_alias_info_file(name))
                        continue;

and loaded without any error report:

	static int __perf_pmu__new_alias(struct list_head *list, char *dir, char *name,
					 char *desc __maybe_unused, char *val)
	SNIP
		if (dir) {
			/*
			 * load unit name and scale if available
			 */
			perf_pmu__parse_unit(alias, dir, name);
			perf_pmu__parse_scale(alias, dir, name);
			perf_pmu__parse_per_pkg(alias, dir, name);
			perf_pmu__parse_snapshot(alias, dir, name);
		}

		list_add_tail(&alias->list, list);

		return 0;
	}

Which attribute parsing is failing for you?

thanks,
jirka
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