bitbake: runqueue: Improve setscene task handling logic

The previous tasks_covered and tasks_notcovered were basically unstable
data structures. We couldn't always tell whether tasks should be covered
or not when trying to repair the sturcture if sstate tasks reran.

In the end its simpler to throw the lists away and rebuild them based upon
current data rather than trying to patch it adhoc. This turns out to be
simpler and much more reliable and I've much more confidence in this code.

(Bitbake rev: 52ee2ba2c617d928569f5afa404925c8b6f317bc)

Signed-off-by: Richard Purdie <richard.purdie@linuxfoundation.org>

bitbake/lib/bb/runqueue.py

@@ -1730,7 +1730,9 @@ class RunQueueExecute:
         self.tasks_notcovered = set()
         self.scenequeue_notneeded = set()
 
-        self.coveredtopocess = set()
+        # We can't skip specified target tasks which aren't setscene tasks
+        self.cantskip = set(self.rqdata.target_tids)
+        self.cantskip.difference_update(self.rqdata.runq_setscene_tids)
 
         schedulers = self.get_schedulers()
         for scheduler in schedulers:
@@ -2235,12 +2237,12 @@ class RunQueueExecute:
             if not valid:
                 continue
 
+            if tid in self.tasks_scenequeue_done:
+                self.tasks_scenequeue_done.remove(tid)
             for dep in self.sqdata.sq_covered_tasks[tid]:
                 if dep not in self.runq_complete:
-                    if dep in self.tasks_scenequeue_done:
+                    if dep in self.tasks_scenequeue_done and dep not in self.sqdata.unskippable:
                         self.tasks_scenequeue_done.remove(dep)
-                    if dep in self.tasks_notcovered:
-                        self.tasks_notcovered.remove(dep)
 
             if tid in self.sq_buildable:
                 self.sq_buildable.remove(tid)
@@ -2254,6 +2256,8 @@ class RunQueueExecute:
                 self.sqdata.outrightfail.remove(tid)
             if tid in self.scenequeue_notcovered:
                 self.scenequeue_notcovered.remove(tid)
+            if tid in self.scenequeue_covered:
+                self.scenequeue_covered.remove(tid)
 
             (mc, fn, taskname, taskfn) = split_tid_mcfn(tid)
             self.sqdata.stamps[tid] = bb.build.stampfile(taskname + "_setscene", self.rqdata.dataCaches[mc], taskfn, noextra=True)
@@ -2269,41 +2273,8 @@ class RunQueueExecute:
         if changes:
             self.update_holdofftasks()
 
-    def scenequeue_process_notcovered(self, task):
-        if len(self.rqdata.runtaskentries[task].depends) == 0:
-            self.setbuildable(task)
-        notcovered = set([task])
-        while notcovered:
-            new = set()
-            for t in sorted(notcovered):
-                for deptask in sorted(self.rqdata.runtaskentries[t].depends):
-                    if deptask in notcovered or deptask in new or deptask in self.rqdata.runq_setscene_tids or deptask in self.tasks_notcovered:
-                        continue
-                    logger.debug(1, 'Task %s depends on non-setscene task %s so not skipping' % (t, deptask))
-                    new.add(deptask)
-                    self.tasks_notcovered.add(deptask)
-                    if len(self.rqdata.runtaskentries[deptask].depends) == 0:
-                        self.setbuildable(deptask)
-            notcovered = new
-
-    def scenequeue_process_unskippable(self, task):
-        # Look up the dependency chain for non-setscene things which depend on this task
-        # and mark as 'done'/notcovered
-        ready = set([task])
-        while ready:
-            new = set()
-            for t in sorted(ready):
-                for deptask in sorted(self.rqdata.runtaskentries[t].revdeps):
-                    if deptask in ready or deptask in new or deptask in self.tasks_scenequeue_done or deptask in self.rqdata.runq_setscene_tids:
-                        continue
-                    if deptask in self.sqdata.unskippable:
-                        new.add(deptask)
-                        self.tasks_scenequeue_done.add(deptask)
-                        self.tasks_notcovered.add(deptask)
-                        #logger.warning("Up: " + str(deptask))
-            ready = new
-
     def scenequeue_updatecounters(self, task, fail=False):
+
         for dep in sorted(self.sqdata.sq_deps[task]):
             if fail and task in self.sqdata.sq_harddeps and dep in self.sqdata.sq_harddeps[task]:
                 logger.debug(2, "%s was unavailable and is a hard dependency of %s so skipping" % (task, dep))
@@ -2325,39 +2296,30 @@ class RunQueueExecute:
                         continue
                     if self.rqdata.runtaskentries[dep].revdeps.issubset(self.tasks_scenequeue_done):
                         new.add(dep)
-                        #logger.warning(" Down: " + dep)
             next = new
 
-        if task in self.sqdata.unskippable:
-            self.scenequeue_process_unskippable(task)
+        notcovered = set(self.scenequeue_notcovered)
+        notcovered |= self.cantskip
+        for tid in self.scenequeue_notcovered:
+            notcovered |= self.sqdata.sq_covered_tasks[tid]
+        notcovered |= self.sqdata.unskippable.difference(self.rqdata.runq_setscene_tids)
+        notcovered.intersection_update(self.tasks_scenequeue_done)
 
-        if task in self.scenequeue_notcovered:
-            logger.debug(1, 'Not skipping setscene task %s', task)
-            self.scenequeue_process_notcovered(task)
-        elif task in self.scenequeue_covered:
-            logger.debug(1, 'Queued setscene task %s', task)
-            self.coveredtopocess.add(task)
+        covered = set(self.scenequeue_covered)
+        for tid in self.scenequeue_covered:
+            covered |= self.sqdata.sq_covered_tasks[tid]
+        covered.difference_update(notcovered)
+        covered.intersection_update(self.tasks_scenequeue_done)
 
-        for task in sorted(self.coveredtopocess.copy()):
-            if self.sqdata.sq_covered_tasks[task].issubset(self.tasks_scenequeue_done):
-                logger.debug(1, 'Processing setscene task %s', task)
-                covered = self.sqdata.sq_covered_tasks[task]
-                covered.add(task)
+        for tid in notcovered | covered:
+            if len(self.rqdata.runtaskentries[tid].depends) == 0:
+                self.setbuildable(tid)
+            elif self.rqdata.runtaskentries[tid].depends.issubset(self.runq_complete):
+                 self.setbuildable(tid)
 
-                # If a task is in target_tids and isn't a setscene task, we can't skip it.
-                cantskip = covered.intersection(self.rqdata.target_tids).difference(self.rqdata.runq_setscene_tids)
-                for tid in sorted(cantskip):
-                    self.tasks_notcovered.add(tid)
-                    self.scenequeue_process_notcovered(tid)
-                covered.difference_update(cantskip)
+        self.tasks_covered = covered
+        self.tasks_notcovered = notcovered
 
-                # Remove notcovered tasks
-                covered.difference_update(self.tasks_notcovered)
-                self.tasks_covered.update(covered)
-                self.coveredtopocess.remove(task)
-                for tid in sorted(covered):
-                    if self.rqdata.runtaskentries[tid].depends.issubset(self.runq_complete):
-                        self.setbuildable(tid)
         self.update_holdofftasks()
 
     def sq_task_completeoutright(self, task):
@@ -2369,7 +2331,6 @@ class RunQueueExecute:
 
         logger.debug(1, 'Found task %s which could be accelerated', task)
         self.scenequeue_covered.add(task)
-        self.tasks_covered.add(task)
         self.scenequeue_updatecounters(task)
 
     def sq_check_taskfail(self, task):
@@ -2390,7 +2351,6 @@ class RunQueueExecute:
         self.sq_stats.taskFailed()
         bb.event.fire(sceneQueueTaskFailed(task, self.sq_stats, result, self), self.cfgData)
         self.scenequeue_notcovered.add(task)
-        self.tasks_notcovered.add(task)
         self.scenequeue_updatecounters(task, True)
         self.sq_check_taskfail(task)
 
@@ -2400,7 +2360,6 @@ class RunQueueExecute:
         self.sq_stats.taskSkipped()
         self.sq_stats.taskCompleted()
         self.scenequeue_notcovered.add(task)
-        self.tasks_notcovered.add(task)
         self.scenequeue_updatecounters(task, True)
 
     def sq_task_skip(self, task):
@@ -2564,6 +2523,7 @@ def build_scenequeue_data(sqdata, rqdata, rq, cooker, stampcache, sqrq):
     for tid in rqdata.runtaskentries:
         if len(rqdata.runtaskentries[tid].revdeps) == 0:
             sqdata.unskippable.add(tid)
+    sqdata.unskippable |= sqrq.cantskip
     while new:
         new = False
         orig = sqdata.unskippable.copy()
@@ -2572,14 +2532,13 @@ def build_scenequeue_data(sqdata, rqdata, rq, cooker, stampcache, sqrq):
                 continue
             if len(rqdata.runtaskentries[tid].depends) == 0:
                 # These are tasks which have no setscene tasks in their chain, need to mark as directly buildable
-                sqrq.tasks_notcovered.add(tid)
-                sqrq.tasks_scenequeue_done.add(tid)
                 sqrq.setbuildable(tid)
-            sqrq.scenequeue_process_unskippable(tid)
             sqdata.unskippable |= rqdata.runtaskentries[tid].depends
             if sqdata.unskippable != orig:
                 new = True
 
+    sqrq.tasks_scenequeue_done |= sqdata.unskippable.difference(rqdata.runq_setscene_tids)
+
     rqdata.init_progress_reporter.next_stage(len(rqdata.runtaskentries))
 
     # Sanity check all dependencies could be changed to setscene task references