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[S390] cio: reduce cpu utilization during device scan
authorPeter Oberparleiter <peter.oberparleiter@de.ibm.com>
Sat, 26 Jan 2008 13:10:48 +0000 (14:10 +0100)
committerMartin Schwidefsky <schwidefsky@de.ibm.com>
Sat, 26 Jan 2008 13:11:03 +0000 (14:11 +0100)
Minimize calls to cpu intensive function get_subchannel_by_schid()
by introducing function for_each_subchannel_staged() which
temporarily caches the information about registered subchannels
in a bitmap.

Signed-off-by: Peter Oberparleiter <peter.oberparleiter@de.ibm.com>
Signed-off-by: Martin Schwidefsky <schwidefsky@de.ibm.com>

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