trace-cmd: Add plugin for tlb_flush

The tlb_flush tracepoints uses enums that are not yet known by
trace-cmd. Add a plugin to handle that.

Signed-off-by: Steven Rostedt <rostedt@goodmis.org>

2 files changed, 82 insertions, 0 deletions

diff --git a/Makefile b/Makefile
index b92bbeac..63f7e791 100644
--- a/Makefile
+++ b/Makefile
@@ -334,6 +334,7 @@ PLUGIN_OBJS += plugin_xen.o
 PLUGIN_OBJS += plugin_scsi.o
 PLUGIN_OBJS += plugin_cfg80211.o
 PLUGIN_OBJS += plugin_blk.o
+PLUGIN_OBJS += plugin_tlb.o
 
 PLUGINS := $(PLUGIN_OBJS:.o=.so)
 
diff --git a/plugin_tlb.c b/plugin_tlb.c
new file mode 100644
index 00000000..e1d85dc3
--- /dev/null
+++ b/plugin_tlb.c
@@ -0,0 +1,81 @@
+/*
+ * Copyright (C) 2015 Red Hat Inc, Steven Rostedt <srostedt@redhat.com>
+ *
+ * ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
+ * This program is free software; you can redistribute it and/or
+ * modify it under the terms of the GNU Lesser General Public
+ * License as published by the Free Software Foundation;
+ * version 2.1 of the License (not later!)
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ * GNU Lesser General Public License for more details.
+ *
+ * You should have received a copy of the GNU Lesser General Public
+ * License along with this program; if not,  see <http://www.gnu.org/licenses>
+ *
+ * ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
+ */
+#include <stdio.h>
+#include <stdlib.h>
+#include <string.h>
+
+#include "event-parse.h"
+
+enum tlb_flush_reason {
+	TLB_FLUSH_ON_TASK_SWITCH,
+	TLB_REMOTE_SHOOTDOWN,
+	TLB_LOCAL_SHOOTDOWN,
+	TLB_LOCAL_MM_SHOOTDOWN,
+	NR_TLB_FLUSH_REASONS,
+};
+
+static int tlb_flush_handler(struct trace_seq *s, struct pevent_record *record,
+			     struct event_format *event, void *context)
+{
+	unsigned long long val;
+
+	trace_seq_printf(s, "pages=");
+
+	pevent_print_num_field(s, "%ld", event, "pages", record, 1);
+
+	if (pevent_get_field_val(s, event, "reason", record, &val, 1) < 0)
+		return -1;
+
+	trace_seq_puts(s, " reason=");
+
+	switch (val) {
+	case TLB_FLUSH_ON_TASK_SWITCH:
+		trace_seq_puts(s, "flush on task switch");
+		break;
+	case TLB_REMOTE_SHOOTDOWN:
+		trace_seq_puts(s, "remote shootdown");
+		break;
+	case TLB_LOCAL_SHOOTDOWN:
+		trace_seq_puts(s, "local shootdown");
+		break;
+	case TLB_LOCAL_MM_SHOOTDOWN:
+		trace_seq_puts(s, "local mm shootdown");
+		break;
+	}
+
+	trace_seq_printf(s, " (%lld)", val);
+
+	return 0;
+}
+
+int PEVENT_PLUGIN_LOADER(struct pevent *pevent)
+{
+	pevent_register_event_handler(pevent, -1, "tlb", "tlb_flush",
+				      tlb_flush_handler, NULL);
+
+	return 0;
+}
+
+void PEVENT_PLUGIN_UNLOADER(struct pevent *pevent)
+{
+	pevent_unregister_event_handler(pevent, -1,
+					"tlb", "tlb_flush",
+					tlb_flush_handler, NULL);
+}