Re: [PATCH] Real-Time Preemption, using msecs_to_jiffies() instead of HZ

[Ingo Molnar <mingo@elte.hu>]

* Luca Falavigna <dktrkranz@gmail.com> wrote:

> I was looking at kernel/softlookup.c when I noticed you used HZ in order to get
> a 10-second delay:
> 
> void softlockup_tick(struct pt_regs *regs)
> {
> 	...
> 	if (time_after(jiffies, timestamp + 10*HZ)) {
> 	...
> }

oops, indeed. (i've also forwarded your patch to akpm, as the softlockup 
patch is included in -mm too)

> I created this small patch (built against version 
> 2.6.12-rc6-V0.7.48-05) which does use of msecs_to_jiffies() to get a 
> correct behaviour with every platform. Similarly I modified function 
> watchdog and kernel/irq/autoprobe.c file (probe_irq_on function).
> 
> Here is the patch:

> ++	msleep(msecs_to_jiffies(20));
> ++	msleep(msecs_to_jiffies(100));
> ++		msleep_interruptible(msecs_to_jiffies(1000));

actually, this should be msleep(20/100/1000). I've fixed these in my 
tree.

	Ingo