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

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Date:   Wed, 7 Jun 2017 11:47:23 +0530
From:   vinayak menon <vinayakm.list@...il.com>
To:     Minchan Kim <minchan@...nel.org>
Cc:     zhong jiang <zhongjiang@...wei.com>,
        Andrew Morton <akpm@...ux-foundation.org>, mhocko@...e.com,
        "linux-mm@...ck.org" <linux-mm@...ck.org>,
        linux-kernel@...r.kernel.org
Subject: Re: [PATCH] Revert "mm: vmpressure: fix sending wrong events on underflow"

On Wed, Jun 7, 2017 at 11:42 AM, Minchan Kim <minchan@...nel.org> 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.