On Thu, 9 Jan 2014 09:13:31 +0900 Joonsoo Kim <iamjoonsoo.kim@xxxxxxx> wrote: > On Wed, Jan 08, 2014 at 01:59:30PM -0800, Andrew Morton wrote: > > On Wed, 8 Jan 2014 23:37:49 +0200 Pekka Enberg <penberg@xxxxxxxxxx> wrote: > > > > > The patch looks good to me but it probably should go through Andrew's tree. > > > > yup. > > > > page_mapping() will be called quite frequently, and adding a new > > test-n-branch in there will be somewhat costly. We might end up with a > > better kernel if we were to instead revert 8456a648cf44f. How useful > > was that patch? > > Hello, > > Performance effect of this patch was decribed in the cover-letter, but > I missed to attach it to patch description. Sorry about that. > > In summary, this patch saves some memory and decreases cache-footprint > so that it increases performance. > > Here goes the description in cover-letter. > > ... > > cache-misses are reduced by this patchset, roughly 5%. > And elapsed times are also improved by 3.1% to baseline. ah, OK, thanks, useful. A few instructions added to page_mapping() won't have effects like that! -- To unsubscribe from this list: send the line "unsubscribe linux-parisc" in the body of a message to majordomo@xxxxxxxxxxxxxxx More majordomo info at http://vger.kernel.org/majordomo-info.html
