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

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Message-ID: <20170125053849.GF2234@jagdpanzerIV.localdomain>
Date:   Wed, 25 Jan 2017 14:38:49 +0900
From:   Sergey Senozhatsky <sergey.senozhatsky.work@...il.com>
To:     Minchan Kim <minchan@...nel.org>
Cc:     Sergey Senozhatsky <sergey.senozhatsky.work@...il.com>,
        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 (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.

	-ss