Re: x86: disable preemption in delay_tsc()

[Date Prev][Date Next][Thread Prev][Thread Next][Date Index][Thread Index]

 



* Andrew Morton <[email protected]> wrote:

> It sounds like it would work OK.  What is the setup cost for a usleep?  
> I'd have thought that code which does something like
> 
> 	while (i++ < 1000) {
> 		foo();
> 		udelay(1);
> 	}
> 
> would take qiute a bit longer with such a change?

full roundtrip cost ought to be below 10 usecs, depending on the system. 
There's no problem doing a non-preemptible udelay up to 10 usecs and we 
could use usleep above that.

	Ingo
-
To unsubscribe from this list: send the line "unsubscribe linux-kernel" in
the body of a message to [email protected]
More majordomo info at  http://vger.kernel.org/majordomo-info.html
Please read the FAQ at  http://www.tux.org/lkml/

[Index of Archives]     [Kernel Newbies]     [Netfilter]     [Bugtraq]     [Photo]     [Stuff]     [Gimp]     [Yosemite News]     [MIPS Linux]     [ARM Linux]     [Linux Security]     [Linux RAID]     [Video 4 Linux]     [Linux for the blind]     [Linux Resources]
  Powered by Linux