Re: [PATCH] Revert "mm: vmpressure: fix sending wrong events on underflow"

[vinayak menon]

On Wed, Jun 7, 2017 at 11:42 AM, Minchan Kim <minchan@xxxxxxxxxx> wrote:
> On Wed, Jun 07, 2017 at 12:56:57PM +0800, zhong jiang wrote:
>> On 2017/6/7 11:55, Minchan Kim wrote:
>> > On Wed, Jun 07, 2017 at 11:08:37AM +0800, zhongjiang wrote:
>> >> This reverts commit e1587a4945408faa58d0485002c110eb2454740c.
>> >>
>> >> THP lru page is reclaimed , THP is split to normal page and loop again.
>> >> reclaimed pages should not be bigger than nr_scan.  because of each
>> >> loop will increase nr_scan counter.
>> > Unfortunately, there is still underflow issue caused by slab pages as
>> > Vinayak reported in description of e1587a4945408 so we cannot revert.
>> > Please correct comment instead of removing the logic.
>> >
>> > Thanks.
>>   we calculate the vmpressue based on the Lru page, exclude the slab pages by previous
>>   discussion.    is it not this?
>>
>
> IIRC, It is not merged into mainline although mmotm has it.

That's right Minchan. That patch was not mainlined.