Re: [patch, 2.6.10-rc2] sched: fix ->nr_uninterruptible handlingbugs

[Paul Jackson]

True - thanks - including the part about the cost of locking bugs.

My question was poorly phrased - the code speaks the answer to the
real question I had:

  $ grep define.atomic_ include/asm-ia64/atomic.h | head -2
  #define atomic_read(v)          ((v)->counter)
  #define atomic_set(v,i)         (((v)->counter) = (i))

An atomic_read() of a one word counter on ia64 is just a load, and an
atomic_set() is just a store.  This is unlike the more difficult
atomic_inc, atomic_dec, atomic_add, atomic_mutilate, ... calls that
require something fancier, and I presume more painful for that CPUs
innards.

Good.  Thanks.

-- 
                  I won't rest till it's the best ...
                  Programmer, Linux Scalability
                  Paul Jackson <pj@xxxxxxx> 1.650.933.1373, 1.925.600.0401
-
To unsubscribe from this list: send the line "unsubscribe linux-kernel" in
the body of a message to majordomo@xxxxxxxxxxxxxxx
More majordomo info at  http://vger.kernel.org/majordomo-info.html
Please read the FAQ at  http://www.tux.org/lkml/