2014-12-16 18:15 GMT+03:00 Jesper Dangaard Brouer <bro...@redhat.com>: > On Tue, 16 Dec 2014 08:53:08 -0600 (CST) > Christoph Lameter <c...@linux.com> wrote: > >> On Tue, 16 Dec 2014, Joonsoo Kim wrote: >> >> > > Like this: >> > > >> > > return d > 0 && d < page->objects * s->size; >> > > >> > >> > Yes! That's what I'm looking for. >> > Christoph, how about above change? >> >> Ok but now there is a multiplication in the fast path. > > Could we pre-calculate the value (page->objects * s->size) and e.g store it > in struct kmem_cache, thus saving the imul ? >
No, one kmem_cache could have several pages with different orders, therefore different page->objects. > -- > Best regards, > Jesper Dangaard Brouer > MSc.CS, Sr. Network Kernel Developer at Red Hat > Author of http://www.iptv-analyzer.org > LinkedIn: http://www.linkedin.com/in/brouer -- To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to majord...@vger.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/