linux-kernel - [PATCH] perf/tool: Fix usage of trace events with '-' in trace system name.

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Date:	Mon, 24 Mar 2014 21:49:00 +0100
From:	Christian Borntraeger <borntraeger@...ibm.com>
To:	Peter Zijlstra <a.p.zijlstra@...llo.nl>,
	Paul Mackerras <paulus@...ba.org>,
	Ingo Molnar <mingo@...hat.com>,
	Arnaldo Carvalho de Melo <acme@...stprotocols.net>
Cc:	Paolo Bonzini <pbonzini@...hat.com>, KVM <kvm@...r.kernel.org>,
	linux-s390 <linux-s390@...r.kernel.org>,
	Cornelia Huck <cornelia.huck@...ibm.com>,
	linux-kernel@...r.kernel.org,
	Alexander Yarygin <yarygin@...ux.vnet.ibm.com>,
	Christian Borntraeger <borntraeger@...ibm.com>
Subject: [PATCH] perf/tool: Fix usage of trace events with '-' in trace system name.

From: Alexander Yarygin <yarygin@...ux.vnet.ibm.com>

Trace events potentially can have a '-' in their trace system name,
e.g. kvm on s390 defines kvm-s390:* tracepoints.
tools/perf could not parse them, because there was no rule for this:
$ sudo ./perf top -e "kvm-s390:*"
invalid or unsupported event: 'kvm-s390:*'

This patch adds an extra rule to event_legacy_tracepoint which handles
those cases. Without the patch, perf will not accept such tracepoints in
the -e option.

Signed-off-by: Alexander Yarygin <yarygin@...ux.vnet.ibm.com>
Signed-off-by: Christian Borntraeger <borntraeger@...ibm.com>
---
 tools/perf/util/parse-events.y | 12 ++++++++++++
 1 file changed, 12 insertions(+)

diff --git a/tools/perf/util/parse-events.y b/tools/perf/util/parse-events.y
index 4eb67ec..dbbb01c 100644
--- a/tools/perf/util/parse-events.y
+++ b/tools/perf/util/parse-events.y
@@ -299,6 +299,18 @@ PE_PREFIX_MEM PE_VALUE sep_dc
 }
 
 event_legacy_tracepoint:
+PE_NAME '-' PE_NAME ':' PE_NAME
+{
+	struct parse_events_evlist *data = _data;
+	struct list_head *list;
+	char sys_name[strlen($1) + strlen($3) + 2];
+	sprintf(&sys_name, "%s-%s", $1, $3);
+
+	ALLOC_LIST(list);
+	ABORT_ON(parse_events_add_tracepoint(list, &data->idx, &sys_name, $5));
+	$$ = list;
+}
+|
 PE_NAME ':' PE_NAME
 {
 	struct parse_events_evlist *data = _data;
-- 
1.8.4.2

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