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https://bugzilla.redhat.com/show_bug.cgi?id=1264008 The existing algorithm assumed that someone was making small, incremental changes; however, it is possible to change iothreads from 0 (or relatively small number) to some really large number and the algorithm would possibly spin its wheels doing unnecessary searches. So, optimize the algorithm using a bitmap to find available iothread_id's starting at 1 that aren't already defined by a "<thread id='#'>" and filling in the iothreadids array with those iothread_id values.
LibVirt : simple API for virtualization
Libvirt is a C toolkit to interact with the virtualization capabilities
of recent versions of Linux (and other OSes). It is free software
available under the GNU Lesser General Public License. Virtualization of
the Linux Operating System means the ability to run multiple instances of
Operating Systems concurrently on a single hardware system where the basic
resources are driven by a Linux instance. The library aim at providing
long term stable C API initially for the Xen paravirtualization but
should be able to integrate other virtualization mechanisms if needed.
Daniel Veillard <veillard@redhat.com>