Re: [PATCH v3] zram: extend zero pages to same element pages

[zhouxianrong]

i am not sure as well about reverse hurting cache.

On 2017/1/23 14:13, Joonsoo Kim wrote:
> On Mon, Jan 23, 2017 at 01:47:20PM +0900, Minchan Kim wrote:
> > Hello,
> >
> > When I look at first patch, I wanted to use increment loop but didn't
> > tell to you because that small piece of code is no harmful for readbility
> > to me so I want to keep author's code rather than pointing the trivial
> > which is just matter of preference out.
> >
> > Rather than readiblity, I suspect it might hurt performance and talked
> > with Namhyung but we cannot find anything decremental loop is bad
> > compared to incremental. Rather than, many articles have been said
> > decrement loop is faster like zhouxianrong's mentiond although I don't
> > think it makes marginal difference.
> >
> > Joonsoo, why do you think incremental is faster?
> > zhouxianrong, why do you think decrement loops makes cache problem?
> >
> > I'm okay either way. Just want to know why you guys think about it.
>
> Hmm... I guess that cache prefetcher works better for forward access
> but I'm not sure.
>
> Thanks.
>
>
> .