Rechercher une page de manuel

Chercher une autre page de manuel:

__round_jiffies

Langue: en

Autres versions - même langue

Version: June 2009 (debian - 07/07/09)

Section: 9 (Appels noyau Linux)

NAME

__round_jiffies - function to round jiffies to a full second

SYNOPSIS

unsigned long __round_jiffies(unsigned long j, int cpu);

ARGUMENTS

j

the time in (absolute) jiffies that should be rounded

cpu

the processor number on which the timeout will happen

DESCRIPTION

__round_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 exact rounding is skewed for each processor to avoid all processors firing at the exact same time, which could lead to lock contention or spurious cache line bouncing.

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

La masse moléculaire : "Un jour je me promenais sur la plage... il y
avait beaucoup de vent, je me suis retrouvé pencher en avant, le vent à
poussé la matière, la masse moléculaire et j'ai du me battre contre
cette masse parce que c'est pas une masse faite pour l'être humain..."
-+- Jean-Claude VanDamme -+-