Work Load Management (WLM) is a methodology for dynamic relocation and tuning of computing resources, so that distributed work can meet end-to-end performance goals. WLM and QoS are policy based management methodologies. Work (requests, transactions, messages, etc.) is classified into service classes. Each service class is associated with a set of policies, which determine the allocation of resources to the work in the class. Classification is based on diverse attributes, some of which are
governed by the application originating the work. In order to classify a
unit of work, one has to determine the values of relevant attributes.
However, in Linux 2.4 (and may be other systems) those values may not be
available at any point while processing the work. In particular we refer to
the asynchronous communication between the buffer cache associated with the
file system and the I/O device. Most of the requests on this interface
don't carry any information on who application originated the work.
By: Tsipora Barzilai, Gala Golan
Published in: H-0166 in 2002
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