linux-kernel - Re: [RFC PATCH] mm: don't promote exclusive file folios of dying processes

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Message-ID: <3b665ef9-d773-476c-826c-8729056c611c@redhat.com>
Date: Thu, 17 Apr 2025 14:57:37 +0200
From: David Hildenbrand <david@...hat.com>
To: Johannes Weiner <hannes@...xchg.org>, Barry Song <21cnbao@...il.com>
Cc: akpm@...ux-foundation.org, linux-mm@...ck.org,
 linux-kernel@...r.kernel.org, Barry Song <v-songbaohua@...o.com>,
 Baolin Wang <baolin.wang@...ux.alibaba.com>,
 Matthew Wilcox <willy@...radead.org>, Oscar Salvador <osalvador@...e.de>,
 Ryan Roberts <ryan.roberts@....com>, Zi Yan <ziy@...dia.com>
Subject: Re: [RFC PATCH] mm: don't promote exclusive file folios of dying
 processes

>> We actually took a more aggressive approach by implementing a hook to demote
>> exclusive folios of dying apps, which yielded good results—reducing kswapd
>> overhead, refaults, and thrashing. Of course, it is even much more controversial
>> than this patch.
> 
> That doesn't sound wrong to me for Android apps.
> 
> How about a prctl() to request the behavior for those specific app
> processes where you have clear usage signal?

I was thinking about the same, so likely that might be a viable solution.

-- 
Cheers,

David / dhildenb