On Wed, Mar 08, 2006 at 03:36:42PM -0500, Benjamin LaHaise wrote:
> On Wed, Mar 08, 2006 at 12:26:56PM -0800, Ravikiran G Thirumalai wrote:
> > +static inline void percpu_counter_mod_bh(struct percpu_counter *fbc, long amount)
> > +{
> > + local_bh_disable();
> > + fbc->count += amount;
> > + local_bh_enable();
> > +}
>
> Please use local_t instead, then you don't have to do the local_bh_disable()
> and enable() and the whole thing collapses down into 1 instruction on x86.
But on non x86, local_bh_disable() is gonna be cheaper than a cli/atomic op no?
(Even if they were switched over to do local_irq_save() and
local_irq_restore() from atomic_t's that is).
And if we use local_t, we will add the overhead for the non bh
percpu_counter_mod for non x86 arches.
Thanks,
Kiran
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