On Fri, Dec 19, 2014 at 9:55 AM, Dave Jones <da...@redhat.com> wrote:
On Thu, Dec 18, 2014 at 08:48:24PM -0800, Linus Torvalds wrote:
> On Thu, Dec 18, 2014 at 8:03 PM, Dave Jones <da...@redhat.com>
wrote:
> >
> > So the only thing that was on that could cause spinlock overhead
> > was DEBUG_SPINLOCK (and LOCK_STAT, though iirc that's not huge
either)
>
> So DEBUG_SPINLOCK does have one big downside if I recall correctly
-
> the debugging spinlocks are very much not fair. So they don't work
> like the real ticket spinlocks. That might have serious effects on
the
> contention case, with some thread not making any progress due to
just
> the implementation of the debug spinlocks.
Wish DEBUG_SPINLOCK disabled, I see the same behaviour.
Lots of traces spewed, but it seems to run and run (at least so far).
Not quite the same, the spinlocks are gone.
-chris
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