linux-kernel - Re: mm: 5.16 regression: reclaim_throttle leads to stall in near-OOM conditions

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Message-ID: <20211124195449.33f31e7f@mail.inbox.lv>
Date:   Wed, 24 Nov 2021 19:54:49 +0900
From:   Alexey Avramov <hakavlad@...ox.lv>
To:     Mel Gorman <mgorman@...hsingularity.net>
Cc:     linux-mm@...ck.org, linux-kernel@...r.kernel.org, mhocko@...e.com,
        vbabka@...e.cz, neilb@...e.de, akpm@...ux-foundation.org,
        corbet@....net, riel@...riel.com, hannes@...xchg.org,
        david@...morbit.com, willy@...radead.org, hdanton@...a.com,
        penguin-kernel@...ove.sakura.ne.jp, oleksandr@...alenko.name,
        kernel@...mod.org, michael@...haellarabel.com, aros@....com,
        hakavlad@...il.com
Subject: Re: mm: 5.16 regression: reclaim_throttle leads to stall in
 near-OOM conditions

> it does eventually get killed OOM

However, a full minute freeze can be a great evil in many situations - 
during such a freeze, the system is completely unresponsive. 

So my next question is: How reasonable is the value MAX_RECLAIM_RETRIES?
Is it also get "out of thin air"?

And would it make sense to have buttons to adjust the timeouts?