Hi!
Without this patch, kapmd can not get much over 50%, therefore not
saving power properly. Exponential backoff should guarantee that we do
not slow normal system much.
Pavel
--- clean//arch/i386/kernel/apm.c Fri Mar 10 02:15:02 2000
+++ linux/arch/i386/kernel/apm.c Fri May 5 23:58:31 2000
@@ -1058,6 +1065,7 @@
static void apm_mainloop(void)
{
+ int timeout = HZ;
DECLARE_WAITQUEUE(wait, current);
if (smp_num_cpus > 1)
@@ -1067,7 +1075,10 @@
current->state = TASK_INTERRUPTIBLE;
for (;;) {
/* Nothing to do, just sleep for the timeout */
- schedule_timeout(APM_CHECK_TIMEOUT);
+ timeout = 2*timeout;
+ if (timeout > APM_CHECK_TIMEOUT)
+ timeout = APM_CHECK_TIMEOUT;
+ schedule_timeout(timeout);
if (exit_kapmd)
break;
@@ -1082,13 +1093,16 @@
continue;
if (apm_do_idle()) {
unsigned long start = jiffies;
- while (system_idle()) {
+ while ((!exit_kapmd) && system_idle()) {
apm_do_idle();
- if (jiffies - start > APM_CHECK_TIMEOUT)
- break;
+ if (jiffies - start > APM_CHECK_TIMEOUT) {
+ apm_event_handler();
+ start = jiffies;
+ }
}
apm_do_busy();
apm_event_handler();
+ timeout = 1;
}
#endif
}
--
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