From: Sergey Senozhatsky <sergey.senozhatsky.work@gmail.com>
To: Joonsoo Kim <iamjoonsoo.kim@lge.com>
Cc: Sergey Senozhatsky <sergey.senozhatsky.work@gmail.com>,
zhouxianrong <zhouxianrong@huawei.com>,
linux-mm@kvack.org, linux-kernel@vger.kernel.org,
akpm@linux-foundation.org, sergey.senozhatsky@gmail.com,
minchan@kernel.org, ngupta@vflare.org, Mi.Sophia.Wang@huawei.com,
zhouxiyu@huawei.com, weidu.du@huawei.com,
zhangshiming5@huawei.com, won.ho.park@huawei.com
Subject: Re: [PATCH] mm: extend zero pages to same element pages for zram
Date: Mon, 23 Jan 2017 16:13:39 +0900 [thread overview]
Message-ID: <20170123071339.GD2327@jagdpanzerIV.localdomain> (raw)
In-Reply-To: <20170123062716.GF24581@js1304-P5Q-DELUXE>
On (01/23/17 15:27), Joonsoo Kim wrote:
> Hello,
>
> Think about following case in 64 bits kernel.
>
> If value pattern in the page is like as following, we cannot detect
> the same page with 'unsigned int' element.
>
> AAAAAAAABBBBBBBBAAAAAAAABBBBBBBB...
>
> 4 bytes is 0xAAAAAAAA and next 4 bytes is 0xBBBBBBBB and so on.
yep, that's exactly the case that I though would be broken
with a 4-bytes pattern matching. so my conlusion was that
for 4 byte pattern we would have working detection anyway,
for 8 bytes patterns we might have some extra matching.
not sure if it matters that much though.
-ss
next prev parent reply other threads:[~2017-01-23 7:13 UTC|newest]
Thread overview: 40+ messages / expand[flat|nested] mbox.gz Atom feed top
2017-01-06 8:42 [PATCH] mm: extend zero pages to same element pages for zram zhouxianrong
2017-01-09 23:41 ` Minchan Kim
2017-01-13 4:24 ` Sergey Senozhatsky
2017-01-13 6:23 ` Minchan Kim
2017-01-13 6:36 ` Sergey Senozhatsky
2017-01-13 6:47 ` Minchan Kim
2017-01-13 7:02 ` Sergey Senozhatsky
2017-01-13 8:03 ` Minchan Kim
2017-01-13 8:29 ` zhouxianrong
2017-01-21 8:43 ` Sergey Senozhatsky
2017-01-22 2:58 ` zhouxianrong
2017-01-22 4:45 ` Sergey Senozhatsky
2017-01-23 2:58 ` Joonsoo Kim
2017-01-23 3:32 ` zhouxianrong
2017-01-23 4:03 ` Sergey Senozhatsky
2017-01-23 6:27 ` Joonsoo Kim
2017-01-23 7:13 ` Sergey Senozhatsky [this message]
2017-01-23 7:40 ` Minchan Kim
2017-01-24 7:58 ` zhouxianrong
2017-01-25 1:29 ` Minchan Kim
2017-01-25 1:32 ` Sergey Senozhatsky
2017-01-25 2:48 ` Matthew Wilcox
2017-01-25 4:18 ` Sergey Senozhatsky
2017-01-25 4:51 ` Minchan Kim
2017-01-25 5:38 ` Sergey Senozhatsky
2017-01-25 5:44 ` Minchan Kim
2017-01-23 6:26 ` Matthew Wilcox
2017-01-23 6:32 ` 答复: " zhouxianrong
2017-02-03 8:34 ` zhouxianrong
2017-02-03 8:42 ` zhouxianrong
2017-02-03 15:33 ` Matthew Wilcox
2017-02-04 3:33 ` zhouxianrong
2017-02-05 14:21 ` Minchan Kim
2017-02-06 1:28 ` zhouxianrong
2017-02-06 14:14 ` Matthew Wilcox
2017-02-06 23:48 ` Minchan Kim
2017-02-07 2:20 ` zhouxianrong
2017-02-07 2:54 ` Minchan Kim
2017-02-07 3:24 ` zhouxianrong
2017-02-07 4:57 ` Minchan Kim
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