[PATCH 2/2] testbot: Fix activity statistics for short periods of time.

[Francois Gouget]

When looking at the activity for a VM we get an initial 'unknown'
segment that goes up to the first record for that VM. This is because
we don't know what the state of the VM was before that first record.
For long periods it does not matter much but for short ones, say 5
minutes, an unknown segment could be all we have if the VM has been in
the same state for more than 5 minutes, for instance while running a
task.
So analyze the activity beyond the specified period, up to the largest
amount of time a task can take so we are sure to get the VM's 'previous'
record. Then, when computing the statistics, ignore any data that falls
outside the period under consideration.
Of course this only works for statistics about VM operations and
running tasks (so running.time, reverting.time, etc) not for those
about idle or off VMs (idle.time, etc.).

Signed-off-by: Francois Gouget 
---
 testbot/lib/WineTestBot/Activity.pm | 24 +++++++++++++++++++++++-
 1 file changed, 23 insertions(+), 1 deletion(-)

diff --git a/testbot/lib/WineTestBot/Activity.pm b/testbot/lib/WineTestBot/Activity.pm
index df1cc59ff..4aed4ed0c 100644
--- a/testbot/lib/WineTestBot/Activity.pm
+++ b/testbot/lib/WineTestBot/Activity.pm
@@ -412,11 +412,33 @@ sub GetStatistics($;$)
     @JobTimes = (); # free early
   }

-  my ($Activity, $Counters) = GetActivity($VMs, $Seconds);
+  my $ActivitySeconds;
+  if ($Seconds)
+  {
+    # When looking at the activity for a VM we get an initial 'unknown' segment
+    # that goes up to the first record for that VM. This is because we don't
+    # know what the state of the VM was before that first record.
+    # For long periods it does not matter much but for short ones, say 5
+    # minutes, an unknown segment could be all we have if the VM has been in
+    # the same state for more than 5 minutes, for instance while running a
+    # task.
+    # So analyze the activity beyond the specified period, up to the largest
+    # amount of time a task can take so are sure to get the VM's 'previous'
+    # record. Then when computing the statistics, ignore any data that falls
+    # outside the period under consideration.
+    # Of course this only works for statistics about VM operations and running
+    # tasks (so running.time, reverting.time, etc) not for those about idle or
+    # off VMs (idle.time, etc.).
+    $ActivitySeconds = $Seconds + 60 +
+        ($SuiteTimeout > $ReconfigTimeout ? $SuiteTimeout : $ReconfigTimeout);
+  }
+  my ($Activity, $Counters) = GetActivity($VMs, $ActivitySeconds);
   $GlobalStats->{"recordgroups.count"} = $Counters->{recordgroups};
   $GlobalStats->{"records.count"} = $Counters->{records};
   foreach my $Group (@$Activity)
   {
+    next if ($Group->{end} < $Cutoff);
+
     _UpdateMin($VMsStats->{start}, $Group->{start});
     next if (!$Group->{statusvms});