Re: [PATCH] i386 Time: Avoid PIT SMP lockups

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

 



On Monday 16 October 2006 20:39, Andrew Morton wrote:
> On 16 Oct 2006 15:48:02 +0200
> Andi Kleen <[email protected]> wrote:
> 
> > Andrew Morton <[email protected]> writes:
> > > 
> > > Is there any actual need to hold xtime_lock while doing the port IO?  I'd
> > > have thought it would suffice to do
> > > 
> > > 	temp = port_io
> > > 	write_seqlock(xtime_lock);
> > > 	xtime = muck_with(temp);
> > > 	write_sequnlock(xtime_lock);
> > > 
> > > ?
> > 
> > That would be a good idea in general. The trouble is just that whatever race
> > is there will be still there then, just harder to trigger (so instead of 
> > every third boot it will muck up every 6 weeks). Not sure that is
> > a real improvement.
> > 
> 
> Confused.  What race are you referring to?

Sorry s/race/starvation/

> 
> This is addressing a starvation problem which is due to the slowness of the
> port-io (iirc).

Is it just sure to go away when the critical section is shorter?

-Andi


 
-
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