part_round_stats man page on Scientific

part_round_stats man page on Scientific

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PART_ROUND_STATS(9)		 Block Devices		   PART_ROUND_STATS(9)

NAME
       part_round_stats - Round off the performance stats on a struct
       disk_stats.

SYNOPSIS
       void part_round_stats(int cpu, struct hd_struct * part);

ARGUMENTS
       cpu
	   cpu number for stats access

       part
	   target partition

DESCRIPTION
       The average IO queue length and utilisation statistics are maintained
       by observing the current state of the queue length and the amount of
       time it has been in this state for.

       Normally, that accounting is done on IO completion, but that can result
       in more than a second´s worth of IO being accounted for within any one
       second, leading to >100% utilisation. To deal with that, we call this
       function to do a round-off before returning the results when reading
       /proc/diskstats. This accounts immediately for all queue usage up to
       the current jiffies and restarts the counters again.

COPYRIGHT
Kernel Hackers Manual 2.6.	 November 2013		   PART_ROUND_STATS(9)

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