Re: [PATCH] per-page SLAB freeing (only dcache for now)

[Arjan van de Ven <arjanv@redhat.com>]

On Fri, Oct 21, 2005 at 11:31:11PM -0700, Andrew Morton wrote:
> Marcelo Tosatti <marcelo.tosatti@cyclades.com> wrote:
> >
> > ...
> > +unsigned long long slab_free_status(kmem_cache_t *cachep, struct slab *slabp)
> > +{
> > +	unsigned long long bitmap = 0;
> > +	int i;
> > +
> > +	if (cachep->num > sizeof(unsigned long long)*8)
> > +		BUG();
> > +
> > +	spin_lock_irq(&cachep->spinlock);
> > +	for(i=0; i < cachep->num ; i++) {
> > +		if (slab_bufctl(slabp)[i] == BUFCTL_INUSE)
> > +			set_bit(i, (unsigned long *)&bitmap);
> > +	}
> > +	spin_unlock_irq(&cachep->spinlock);
> > +
> > +	return bitmap;
> > +}
> 
> What if there are more than 64 objects per page?

the bitops usually work on bigger than wordsize things though..

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