Re: [RFC PATCH v2 2/2] Architecture defined limit on memory region random shift.

[Ilya Smith <blackzert@xxxxxxxxx>]

On 22 Mar 2018, at 23:54, Andrew Morton <akpm@xxxxxxxxxxxxxxxxxxxx> wrote:

Please add changelogs.  An explanation of what a "limit on memory
region random shift" is would be nice ;) Why does it exist, why are we
doing this, etc.  Surely there's something to be said - at present this
is just a lump of random code?

Sorry, my bad. The main idea of this limit is to decrease possible memory 

fragmentation. This is not so big problem on 64bit process, but really big for 

32 bit processes since may cause failure memory allocation. To control memory 

fragmentation and protect 32 bit systems (or architectures) this limit was 

introduce by this patch. It could be also moved to CONFIG_ as well.

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