ROUND_JIFFIES - Online Linux Manual PageSection : 9
Updated : June 2018
Source : Kernel Hackers Manual 2​.6​.
Note : Driver Basics

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NAMEround_jiffies − function to round jiffies to a full second

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SYNOPSISunsigned long round_jiffies(unsigned long j);

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ARGUMENTSj the time in (absolute) jiffies that should be rounded

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DESCRIPTIONround_jiffies rounds an absolute time 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​.

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