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Date:   Sat, 29 Feb 2020 20:40:00 -0800
From:   Andrew Morton <akpm@linux-foundation.org>
To:     Joonsoo Kim <js1304@gmail.com>
Cc:     linux-mm@kvack.org, linux-kernel@vger.kernel.org,
        Johannes Weiner <hannes@cmpxchg.org>,
        Michal Hocko <mhocko@kernel.org>,
        Hugh Dickins <hughd@google.com>,
        Minchan Kim <minchan@kernel.org>,
        Vlastimil Babka <vbabka@suse.cz>,
        Mel Gorman <mgorman@techsingularity.net>, kernel-team@lge.com
Subject: Re: [PATCH v2 0/9] workingset protection/detection on the anonymous
 LRU list
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In-Reply-To: <20200227074748.GA18113@js1304-desktop>
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        <20200226193942.30049da9c090b466bdc5ec23@linux-foundation.org>
        <20200227074748.GA18113@js1304-desktop>
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On Thu, 27 Feb 2020 16:48:47 +0900 Joonsoo Kim <js1304@gmail.com> wrote:

> Hello, Andrew.
> 
> > > * SOLUTION
> > > Since this is what we want to avoid, this patchset implements workingset
> > > protection. Like as the file LRU list, newly created or swap-in anonymous
> > > page is started on the inactive list. Also, like as the file LRU list,
> > > if enough reference happens, the page will be promoted. This simple
> > > modification changes the above example as following.
> > 
> > One wonders why on earth we weren't doing these things in the first
> > place?
> 
> I don't know. I tried to find the origin of this behaviour and found
> that it's from you 18 years ago. :)
> 
> It mentions that starting pages on the active list boosts throughput on
> stupid swapstormy test but I cannot guess the exact reason of such
> improvement.
> 
> Anyway, Following is the related patch history. Could you remember
> anything about it?
> 

erm, yes, that was a long time ago ;) I guess enough other things have
changed since then to necessitate a revisit!