round_jiffies_relative(9) suse man page | unix.com

ROUND_JIFFIES_RELATI(9) 					   Driver Basics					   ROUND_JIFFIES_RELATI(9)

NAME
       round_jiffies_relative - function to round jiffies to a full second

SYNOPSIS
       unsigned long round_jiffies_relative(unsigned long j);

ARGUMENTS
       j
	   the time in (relative) jiffies that should be rounded

DESCRIPTION
       round_jiffies_relative rounds a time delta in the future (in jiffies) up or down to (approximately) full seconds. This is useful for timers
       for which the exact time they fire does not matter too much, as long as they fire approximately every X seconds.

       By rounding these timers to whole seconds, all such timers will fire at the same time, rather than at various times spread out. The goal of
       this is to have the CPU wake up less, which saves power.

       The return value is the rounded version of the j parameter.

COPYRIGHT
Kernel Hackers Manual 2.6.					     July 2010						   ROUND_JIFFIES_RELATI(9)