2014-12-16 18:15 GMT+03:00 Jesper Dangaard Brouer <brouer@xxxxxxxxxx>: > On Tue, 16 Dec 2014 08:53:08 -0600 (CST) > Christoph Lameter <cl@xxxxxxxxx> 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, send a message with 'unsubscribe linux-mm' in the body to majordomo@xxxxxxxxx. For more info on Linux MM, see: http://www.linux-mm.org/ . Don't email: <a href=mailto:"dont@xxxxxxxxx";> email@xxxxxxxxx </a>