buildstats: add system state sampling

/proc/[diskstats|meminfo|stat] get sampled and written to the same
proc_<filename>.log files as during normal bootchat logging. This will
allow rendering the CPU, disk and memory usage charts.

Right now sampling happens once a second, triggered by the heartbeat
event.That produces quite a bit of data for long builds, which will be
addressed in a separate commit by storing the data in a more compact
form.

(From OE-Core rev: 6f4e8180b5b4857eaf6caf410fd3a4a41ed85930)

Signed-off-by: Patrick Ohly <patrick.ohly@intel.com>
Signed-off-by: Ross Burton <ross.burton@intel.com>
Signed-off-by: Richard Purdie <richard.purdie@linuxfoundation.org>

1 files changed, 24 insertions, 0 deletions

diff --git a/meta/classes/buildstats.bbclass b/meta/classes/buildstats.bbclass
index 57ecc8fee8..9c0c37dcdd 100644
--- a/meta/classes/buildstats.bbclass
+++ b/meta/classes/buildstats.bbclass
@@ -188,3 +188,27 @@ python run_buildstats () {
 addhandler run_buildstats
 run_buildstats[eventmask] = "bb.event.BuildStarted bb.event.BuildCompleted bb.build.TaskStarted bb.build.TaskSucceeded bb.build.TaskFailed"
 
+python runqueue_stats () {
+    import buildstats
+    from bb import event, runqueue
+    # We should not record any samples before the first task has started,
+    # because that's the first activity shown in the process chart.
+    # Besides, at that point we are sure that the build variables
+    # are available that we need to find the output directory.
+    # The persistent SystemStats is stored in the datastore and
+    # closed when the build is done.
+    system_stats = d.getVar('_buildstats_system_stats', True)
+    if not system_stats and isinstance(e, (bb.runqueue.sceneQueueTaskStarted, bb.runqueue.runQueueTaskStarted)):
+        system_stats = buildstats.SystemStats(d)
+        d.setVar('_buildstats_system_stats', system_stats)
+    if system_stats:
+        # Ensure that we sample at important events.
+        done = isinstance(e, bb.event.BuildCompleted)
+        system_stats.sample(force=done)
+        if done:
+            system_stats.close()
+            d.delVar('_buildstats_system_stats')
+}
+
+addhandler runqueue_stats
+runqueue_stats[eventmask] = "bb.runqueue.sceneQueueTaskStarted bb.runqueue.runQueueTaskStarted bb.event.HeartbeatEvent bb.event.BuildCompleted"