fbcon uses workqueues and it has no real dependency of scheduling these on the cpu which scheduled them.
On a idle system, it is observed that and idle cpu wakes up many times just to service this work. It would be better if we can schedule it on a cpu which the scheduler believes to be the most appropriate one.
This patch replaces system_wq with system_power_efficient_wq.
Cc: Dave Airlie airlied@redhat.com Cc: linux-fbdev@vger.kernel.org Signed-off-by: Viresh Kumar viresh.kumar@linaro.org --- drivers/video/console/fbcon.c | 2 +- 1 file changed, 1 insertion(+), 1 deletion(-)
diff --git a/drivers/video/console/fbcon.c b/drivers/video/console/fbcon.c index 3cd6759..0cae83d 100644 --- a/drivers/video/console/fbcon.c +++ b/drivers/video/console/fbcon.c @@ -404,7 +404,7 @@ static void cursor_timer_handler(unsigned long dev_addr) struct fb_info *info = (struct fb_info *) dev_addr; struct fbcon_ops *ops = info->fbcon_par;
- schedule_work(&info->queue); + queue_work(system_power_efficient_wq, &info->queue); mod_timer(&ops->cursor_timer, jiffies + HZ/5); }