linux-kernel - Re: [PATCH] mm/vmscan: don't scan adjust too much if current is not kswapd

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Message-ID: <f946fbd8-89f6-67c9-44c1-10ef6e3bdb68@loongson.cn>
Date:   Wed, 21 Sep 2022 18:14:30 +0800
From:   Hongchen Zhang <zhanghongchen@...ngson.cn>
To:     Mel Gorman <mgorman@...hsingularity.net>
Cc:     Mel Gorman <mgorman@...e.de>, Matthew Wilcox <willy@...radead.org>,
        Andrew Morton <akpm@...ux-foundation.org>, linux-mm@...ck.org,
        linux-kernel@...r.kernel.org
Subject: Re: [PATCH] mm/vmscan: don't scan adjust too much if current is not
 kswapd

Hi Mel,

Thanks for your reply.

On 2022/9/21 pm 5:13, Mel Gorman wrote:
> On Tue, Sep 20, 2022 at 10:23:05AM +0800, Hongchen Zhang wrote:
>> Hi Mel,
>>
>> The scan adjust algorithm was originally introduced by you from
>> commmit e82e0561dae9 ("mm: vmscan: obey proportional scanning requirements
>> for kswapd"), any suggestion about this fix patch?
>> In short, proportional scanning is not friendly to processes other than
>> kswapd.
>>
> 
> I suspect that 6eb90d649537 ("mm: vmscan: fix extreme overreclaim and swap
> floods") is a more appropriate fix. While it also has a fairness impact,
> it's a more general approach that is likely more robust and while
> fairness is important, completely thrashing a full LRU is neither fair
> nor expected.
> 
OK,got it. Let's wait for the 6eb90d649537 ("mm: vmscan: fix extreme 
overreclaim and swap floods") enter the stable repository.

Best Regards
Hongchen Zhang