Re: [RFC 0/4] ZRAM: make it just store the high compression rate page

[Hui Zhu]

Hi Minchan,

On Wed, Aug 24, 2016 at 9:04 AM, Minchan Kim <minchan@xxxxxxxxxx> wrote:
> Hi Hui,
>
> On Mon, Aug 22, 2016 at 04:25:05PM +0800, Hui Zhu wrote:
>> Current ZRAM just can store all pages even if the compression rate
>> of a page is really low.  So the compression rate of ZRAM is out of
>> control when it is running.
>> In my part, I did some test and record with ZRAM.  The compression rate
>> is about 40%.
>>
>> This series of patches make ZRAM can just store the page that the
>> compressed size is smaller than a value.
>> With these patches, I set the value to 2048 and did the same test with
>> before.  The compression rate is about 20%.  The times of lowmemorykiller
>> also decreased.
>
> I have an interest about the feature for a long time but didn't work on it
> because I didn't have a good idea to implment it with generic approach
> without layer violation. I will look into this after handling urgent works.
>
> Thanks.

That will be great.  Thanks.

Best,
Hui