[OE-core] [PATCH] lib/oeqa/qemurunner: Use a timeout in select() call

[Richard Purdie]

A 0 value to select.select() immediately returns with no timeout. This was
pegging the cpu at 100% for the python process which was bad and may be
contributing to some of the timeout problems.

Profile from -P of a core-image-minimal before:

    97526792 function calls (97525652 primitive calls) in 45.189 seconds

and after:

       50204 function calls (49064 primitive calls) in 17.318 seconds

Saving 97.5 million function calls has to be good :)

(From OE-Core rev: a572348c7ec1eb82fa2e5c977b27c24b4a9b29a1)

Signed-off-by: Richard Purdie <richard.purdie at linuxfoundation.org>
---
diff --git a/meta/lib/oeqa/utils/qemurunner.py b/meta/lib/oeqa/utils/qemurunner.py
index e7bd8b1..f837800 100644
--- a/meta/lib/oeqa/utils/qemurunner.py
+++ b/meta/lib/oeqa/utils/qemurunner.py
@@ -101,7 +101,7 @@ class QemuRunner:
             reachedlogin = False
             stopread = False
             while time.time() < endtime and not stopread:
-                sread, swrite, serror = select.select(socklist, [], [], 0)
+                sread, swrite, serror = select.select(socklist, [], [], 0.1)
                 for sock in sread:
                     if sock is self.server_socket:
                         self.qemusock, addr = self.server_socket.accept()