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This commit is contained in:
Simon Gardling
2024-09-10 13:03:02 -04:00
parent 53c617d779
commit d66450e427
381 changed files with 28864 additions and 34170 deletions
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72
kern/thread/clock.c
View File

@@ -50,8 +50,8 @@
* Timing constants. These should be tuned along with any work done on
* the scheduler.
*/
#define SCHEDULE_HARDCLOCKS 4 /* Reschedule every 4 hardclocks. */
#define MIGRATE_HARDCLOCKS 16 /* Migrate every 16 hardclocks. */
#define SCHEDULE_HARDCLOCKS 4 /* Reschedule every 4 hardclocks. */
#define MIGRATE_HARDCLOCKS 16 /* Migrate every 16 hardclocks. */
/*
* Once a second, everything waiting on lbolt is awakened by CPU 0.
@@ -62,60 +62,52 @@ static struct spinlock lbolt_lock;
/*
* Setup.
*/
void
hardclock_bootstrap(void)
{
spinlock_init(&lbolt_lock);
lbolt = wchan_create("lbolt");
if (lbolt == NULL) {
panic("Couldn't create lbolt\n");
}
void hardclock_bootstrap(void) {
spinlock_init(&lbolt_lock);
lbolt = wchan_create("lbolt");
if (lbolt == NULL) {
panic("Couldn't create lbolt\n");
}
}
/*
* This is called once per second, on one processor, by the timer
* code.
*/
void
timerclock(void)
{
/* Just broadcast on lbolt */
spinlock_acquire(&lbolt_lock);
wchan_wakeall(lbolt, &lbolt_lock);
spinlock_release(&lbolt_lock);
void timerclock(void) {
/* Just broadcast on lbolt */
spinlock_acquire(&lbolt_lock);
wchan_wakeall(lbolt, &lbolt_lock);
spinlock_release(&lbolt_lock);
}
/*
* This is called HZ times a second (on each processor) by the timer
* code.
*/
void
hardclock(void)
{
/*
* Collect statistics here as desired.
*/
void hardclock(void) {
/*
* Collect statistics here as desired.
*/
curcpu->c_hardclocks++;
if ((curcpu->c_hardclocks % MIGRATE_HARDCLOCKS) == 0) {
thread_consider_migration();
}
if ((curcpu->c_hardclocks % SCHEDULE_HARDCLOCKS) == 0) {
schedule();
}
thread_yield();
curcpu->c_hardclocks++;
if ((curcpu->c_hardclocks % MIGRATE_HARDCLOCKS) == 0) {
thread_consider_migration();
}
if ((curcpu->c_hardclocks % SCHEDULE_HARDCLOCKS) == 0) {
schedule();
}
thread_yield();
}
/*
* Suspend execution for n seconds.
*/
void
clocksleep(int num_secs)
{
spinlock_acquire(&lbolt_lock);
while (num_secs > 0) {
wchan_sleep(lbolt, &lbolt_lock);
num_secs--;
}
spinlock_release(&lbolt_lock);
void clocksleep(int num_secs) {
spinlock_acquire(&lbolt_lock);
while (num_secs > 0) {
wchan_sleep(lbolt, &lbolt_lock);
num_secs--;
}
spinlock_release(&lbolt_lock);
}