telemetry: linux telemetry with perf-stat

Signed-off-by: Viliam Luc <vluc@cisco.com>
Change-Id: I17ced17a309cc0ac21c5fc94e570c89a456339e2

1 files changed, 13 insertions, 6 deletions

diff --git a/resources/tools/telemetry/bundle_bpf.py b/resources/tools/telemetry/bundle_bpf.py
index c376da9d63..58cfd5d0b6 100644
--- a/resources/tools/telemetry/bundle_bpf.py
+++ b/resources/tools/telemetry/bundle_bpf.py
@@ -52,12 +52,15 @@ class BundleBpf:
 
         self.obj = BPF(text=self.code)
 
-    def attach(self, duration):
+
+    def attach(self, sample_period):
         """
         Attach events to BPF.
 
-        :param duration: Trial duration.
-        :type duration: int
+        :param sample_period:  A "sampling" event is one that generates
+        an overflow notification every N events, where N is given by
+        sample_period.
+        :type sample_period: int
         """
         try:
             for event in self.events:
@@ -65,15 +68,16 @@ class BundleBpf:
                     ev_type=event[u"type"],
                     ev_config=event[u"name"],
                     fn_name=event[u"target"],
-                    sample_period=duration
+                    sample_period=sample_period
                 )
         except AttributeError:
-            getLogger("console_stderr").error(u"Could not attach BPF events!")
+            getLogger("console_stderr").error(f"Could not attach BPF event: "
+                                              f"{event[u'name']}")
             sys.exit(Constants.err_linux_attach)
 
     def detach(self):
         """
-        Dettach events from BPF.
+        Detach events from BPF.
         """
         try:
             for event in self.events:
@@ -98,6 +102,9 @@ class BundleBpf:
 
         for _, metric_list in self.metrics.items():
             for metric in metric_list:
+                if table_name != metric[u"name"]:
+                    table_name = metric[u"name"]
+                    text += f"{table_name}\n"
                 for (key, val) in self.obj.get_table(metric[u"name"]).items():
                     item = dict()
                     labels = dict()