suse man page for part_round_stats

Query: part_round_stats

OS: suse

Section: 9

Format: Original Unix Latex Style Formatted with HTML and a Horizontal Scroll Bar

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. July 2010 PART_ROUND_STATS(9)
Related Man Pages
pmccontrol(8) - freebsd
blk_init_queue(9) - suse
struct_irq_desc(9) - suse
struct_spi_message(9) - suse
pmc_enable(3) - freebsd
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