__ROUND_JIFFIES_RELA(9) Driver Basics __ROUND_JIFFIES_RELA(9)NAME
__round_jiffies_relative - function to round jiffies to a full second
SYNOPSIS
unsigned long __round_jiffies_relative(unsigned long j, int cpu);
ARGUMENTS
j
the time in (relative) jiffies that should be rounded
cpu
the processor number on which the timeout will happen
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 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.
COPYRIGHT Kernel Hackers Manual 2.6. July 2010 __ROUND_JIFFIES_RELA(9)
Check Out this Related Man Page
STRUCT HRTIMER(9) Driver Basics STRUCT HRTIMER(9)NAME
struct_hrtimer - the basic hrtimer structure
SYNOPSIS
struct hrtimer {
struct rb_node node;
ktime_t _expires;
ktime_t _softexpires;
enum hrtimer_restart (* function) (struct hrtimer *);
struct hrtimer_clock_base * base;
unsigned long state;
#ifdef CONFIG_TIMER_STATS
int start_pid;
void * start_site;
char start_comm[16];
#endif
};
MEMBERS
node
red black tree node for time ordered insertion
_expires
the absolute expiry time in the hrtimers internal representation. The time is related to the clock on which the timer is based. Is
setup by adding slack to the _softexpires value. For non range timers identical to _softexpires.
_softexpires
the absolute earliest expiry time of the hrtimer. The time which was given as expiry time when the timer was armed.
function
timer expiry callback function
base
pointer to the timer base (per cpu and per clock)
state
state information (See bit values above)
start_pid
timer statistics field to store the pid of the task which started the timer
start_site
timer statistics field to store the site where the timer was started
start_comm[16]
timer statistics field to store the name of the process which started the timer
DESCRIPTION
The hrtimer structure must be initialized by hrtimer_init
COPYRIGHT Kernel Hackers Manual 2.6. July 2010 STRUCT HRTIMER(9)
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