doubt on schedule_work() - work task getting scheduled lately
pranjas at gmail.com
Fri Jul 29 06:44:57 EDT 2016
On Fri, Jul 29, 2016 at 4:02 PM, Muni Sekhar <munisekharrms at gmail.com> wrote:
> Hi All,
> I have a doubt regarding the workqueue scheduling.
> I am using the workqueue for processing the Rx Interrupt data. I am
> calling schedule_work() on receiving the Rx interrupt from hardware.
> I calculated the time between calling the schedule_work() and
> workqueue task actually getting executed, Here I see many cases of
> less than 100 us(It is fairly good).
> But sometimes I see 10’s of ms and a lot in the 100’s of ms. I have
> seen over 0.5 secs too. I would like to know why does sometimes kernel
> takes longer time(in milli seconds) to schedule it? Is there any way
> to reduce this time gap?
> My code:
> static void my_workqueuetask(struct work_struct *work)
> printk("In %s() \n",__func__);
You probably don't need this if it's just for your work_fn, yeah but
if there's race between this and something else...
> //Do something here
> static irqreturn_t my_irq_handler(int irq, void *dev)
> if(Rx Interrupt)
Maybe system_wq has too much already on it's plate?
Have you tried the same with completion and a kthread? or
with your own workqueue, overkill but you can give it a shot.
> return IRQ_HANDLED;
> Kernelnewbies mailing list
> Kernelnewbies at kernelnewbies.org
More information about the Kernelnewbies