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powerthresh: add hysteresis to powersave mode

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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);
}