linux-kernel - Re: Let's talk about the elephant in the room - the Linux kernel's inability to gracefully handle low memory pressure

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Message-ID: <20210725023201.13f0d2f2@mail.inbox.lv>
Date:   Sun, 25 Jul 2021 02:32:01 +0900
From:   Alexey Avramov <hakavlad@...ox.lv>
To:     ndrw.xf@...hazel.co.uk
Cc:     akpm@...ux-foundation.org, aros@....com, hannes@...xchg.org,
        linux-kernel@...r.kernel.org, linux-mm@...ck.org,
        mhocko@...nel.org, surenb@...gle.com, vbabka@...e.cz
Subject: Re: Let's talk about the elephant in the room - the Linux kernel's
 inability to gracefully handle low memory pressure

> Would it be possible to reserve a fixed (configurable) amount of RAM 
> for caches, and trigger OOM killer earlier, before most UI code is 
> evicted from memory?

Yes! Try this patch: https://github.com/hakavlad/le9-patch

The patch provides sysctl knobs for protecting the specified amount of 
clean file pages under memory pressure.