[Bug 1091] New: pmapi extension for regularly scheduled fetches

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Bug ID	1091
Summary	pmapi extension for regularly scheduled fetches
Product	pcp
Version	unspecified
Hardware	All
OS	Linux
Status	NEW
Severity	major
Priority	P5
Component	pcp
Assignee	pcp@kenj.com.au
Reporter	fche@redhat.com
CC	pcp@oss.sgi.com
Classification	Unclassified

In order to limit unnecessary load, it would be helpful if the PMAPI
included a single operation to fetch metrics in a recurrent manner.

The aim would be to eliminate having to wake up pmlogger just to send
the inquiry, let it go to sleep awaiting network/pmcd, then waking it
up again when each response comes.  It could help synchronize

A possible PMAPI-flavoured extension might look like:

int pmFetchRecurrent(int numpid, pmID *pmidList, struct timeval interval,
                     int (*consumerCallBack)(pmResult *),
                     volatile int *cancel);

(where the consumer callback and the cancel flag could determine how
long the operation is to continue).  PDU state-machine design etc. TBD.

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