linux-kernel - Re: [PATCH] mm: extend zero pages to same element pages for zram

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Message-ID: <20170125054416.GC18289@bbox>
Date:   Wed, 25 Jan 2017 14:44:16 +0900
From:   Minchan Kim <minchan@...nel.org>
To:     Sergey Senozhatsky <sergey.senozhatsky.work@...il.com>
CC:     Matthew Wilcox <willy@...radead.org>,
        zhouxianrong <zhouxianrong@...wei.com>,
        Joonsoo Kim <iamjoonsoo.kim@....com>, <linux-mm@...ck.org>,
        <linux-kernel@...r.kernel.org>, <akpm@...ux-foundation.org>,
        <sergey.senozhatsky@...il.com>, <ngupta@...are.org>,
        <Mi.Sophia.Wang@...wei.com>, <zhouxiyu@...wei.com>,
        <weidu.du@...wei.com>, <zhangshiming5@...wei.com>,
        <won.ho.park@...wei.com>
Subject: Re: [PATCH] mm: extend zero pages to same element pages for zram

On Wed, Jan 25, 2017 at 02:38:49PM +0900, Sergey Senozhatsky wrote:
> On (01/25/17 13:51), Minchan Kim wrote:
> [..]
> > > Minchan, zhouxianrong, I was completely wrong. we can't
> > > do memset(). d'oh, I did not know it truncates 4 bytes to
> > > one byte only (doesn't make too much sense to me).
> > 
> > Now, I read Matthew's comment and understood. Thanks.
> > It means zhouxianrong's patch I sent recently is okay?
> 
> this one looks OK to me
> https://www.mail-archive.com/linux-kernel@vger.kernel.org/msg1316290.html
> 
> 
> I'd agree with Joonsoo that doing forward prefetching is _probably_ better
> than backwards prefetching. not that it necessarily should confuse the CPU
> (need to google if ARM handles it normally), but still.

Okay, let's settle down.

zhouxianrong, please resend one Sergey pointed out with changing to
forward loop. though, sorry for a lot confusion!

> 
> 	-ss
> 
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