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powerthresh: add hysteresis to powersave mode 

We found that in some cases people were getting log spam from cpus constantly
leaving powersave mode.  This ensures that at least one cpu is in powersave mode
before we re-enable powersave on all cpus.

Signed-off-by: Neil Horman <nhorman@tuxdriver.com>
This commit is contained in:
Neil Horman 2012-01-03 12:54:15 -05:00
parent 02b659c372
commit 5ed963e5cb
1 changed files with 5 additions and 1 deletions
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6
irqlist.c
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@ -45,6 +45,7 @@ struct load_balance_info {
unsigned int num_within;
unsigned int num_over;
unsigned int num_under;
unsigned int num_powersave;
struct topo_obj *powersave;
};
@ -106,6 +107,9 @@ static void migrate_overloaded_irqs(struct topo_obj *obj, void *data)
struct load_balance_info *info = data;
int deviation;
if (obj->powersave_mode)
info->num_powersave++;
/*
* Don't rebalance irqs on objects whos load is below the average
*/
@ -178,7 +182,7 @@ void update_migration_status(void)
info.powersave->powersave_mode = 1;
if (g_list_length(info.powersave->interrupts) > 0)
for_each_irq(info.powersave->interrupts, force_irq_migration, NULL);
} else if (info.num_over) {
} else if ((info.num_over) && (info.num_powersave)) {
syslog(LOG_INFO, "Load average increasing, re-enabling all cpus for irq balancing\n");
for_each_object(cpus, clear_powersave_mode, NULL);
}