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Keir Fraser
27d2e52b7c
In summary, this allows a xenstore transaction object to be passed around the various device controllers, so that they don't have to do lots of singleton transactions. Transactions have very heavy I/O impact from xenstored so reducing their number is important. When running 3 guests, this patch reduces the impact of 'xm list --long' from 176 transactions, scaling O(n) with guests, to 26 transactions with O(1) scaling. I have previously attempted to also address the same issue with 'xm create' but that's much harder since the device front/back handshake requires that XenD use a number of small transactions. So i've not changed anything here. Signed-off-by: Daniel P. Berrange <berrange@redhat.com>
The file test.py here is from the Zope project, and is Copyright (c) 2001, 2002 Zope Corporation and Contributors. This file is released under the Zope Public License, version 2.0, a copy of which is in the file ZPL-2.0.