scripts/oe-build-perf-report: summary of task resource usage

Utilize buildstats, if available, and show a summary of the resource
usage of bitbake tasks in the html report. The details provided are:
- total number of tasks
- top 5 resource-hungry tasks (cputime)
- top 5 increase in resource usage (cputime)
- top 5 decrease in resource usage (cputime)

[YOCTO #11381]

Signed-off-by: Markus Lehtonen <markus.lehtonen@linux.intel.com>
Signed-off-by: Ross Burton <ross.burton@intel.com>

1 files changed, 8 insertions, 0 deletions

diff --git a/scripts/lib/buildstats.py b/scripts/lib/buildstats.py
index 9eb60b1c69..bd6332176a 100644
--- a/scripts/lib/buildstats.py
+++ b/scripts/lib/buildstats.py
@@ -180,6 +180,14 @@ class BSRecipe(object):
 class BuildStats(dict):
     """Class representing buildstats of one build"""
 
+    @property
+    def num_tasks(self):
+        """Get number of tasks"""
+        num = 0
+        for recipe in self.values():
+            num += len(recipe.tasks)
+        return num
+
     @classmethod
     def from_json(cls, bs_json):
         """Create new BuildStats object from JSON object"""