oeqa/utils/qemurunner.py: Fix HIGH CPU usage on LoggingThread

LoggingThread is used for receive console output from QEMU
over TCP, so add filter to only wake poll on read events,
also change the event mask variable name to be more descriptive.

This fixes HIGH CPU consume caused by wake on ready to write
events.

(From OE-Core rev: 7b6c9b6327638c9731cea80a52d30d4a8fb6e081)

Signed-off-by: Aníbal Limón <anibal.limon@linux.intel.com>
Signed-off-by: Richard Purdie <richard.purdie@linuxfoundation.org>

1 files changed, 3 insertions, 3 deletions

diff --git a/meta/lib/oeqa/utils/qemurunner.py b/meta/lib/oeqa/utils/qemurunner.py
index d32c9db46d..6edd37477e 100644
--- a/meta/lib/oeqa/utils/qemurunner.py
+++ b/meta/lib/oeqa/utils/qemurunner.py
@@ -440,9 +440,9 @@ class LoggingThread(threading.Thread):
 
     def eventloop(self):
         poll = select.poll()
-        eventmask = self.errorevents | self.readevents
+        event_read_mask = self.errorevents | self.readevents
         poll.register(self.serversock.fileno())
-        poll.register(self.readpipe, eventmask)
+        poll.register(self.readpipe, event_read_mask)
 
         breakout = False
         self.running = True
@@ -466,7 +466,7 @@ class LoggingThread(threading.Thread):
                     self.readsock, _ = self.serversock.accept()
                     self.readsock.setblocking(0)
                     poll.unregister(self.serversock.fileno())
-                    poll.register(self.readsock.fileno())
+                    poll.register(self.readsock.fileno(), event_read_mask)
 
                     self.logger.info("Setting connection established event")
                     self.connection_established.set()