linux-kernel - Re: [PATCH 0/5] Remove dependency on congestion

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Message-ID: <20210929130040.GJ3959@techsingularity.net>
Date:   Wed, 29 Sep 2021 14:00:41 +0100
From:   Mel Gorman <mgorman@...hsingularity.net>
To:     Linux-MM <linux-mm@...ck.org>
Cc:     NeilBrown <neilb@...e.de>, Theodore Ts'o <tytso@....edu>,
        Andreas Dilger <adilger.kernel@...ger.ca>,
        "Darrick J . Wong" <djwong@...nel.org>,
        Matthew Wilcox <willy@...radead.org>,
        Michal Hocko <mhocko@...e.com>,
        Dave Chinner <david@...morbit.com>,
        Rik van Riel <riel@...riel.com>,
        Vlastimil Babka <vbabka@...e.cz>,
        Johannes Weiner <hannes@...xchg.org>,
        Jonathan Corbet <corbet@....net>,
        Linux-fsdevel <linux-fsdevel@...r.kernel.org>,
        LKML <linux-kernel@...r.kernel.org>
Subject: Re: [PATCH 0/5] Remove dependency on congestion_wait in mm/ v2

On Wed, Sep 29, 2021 at 11:09:09AM +0100, Mel Gorman wrote:
> This is a series that removes all calls to congestion_wait
> in mm/ and deletes wait_iff_congested. It's not a clever
> implementation but congestion_wait has been broken for a long time
> (https://lore.kernel.org/linux-mm/45d8b7a6-8548-65f5-cccf-9f451d4ae3d4@kernel.dk/).
> Even if it worked, it was never a great idea. While excessive
> dirty/writeback pages at the tail of the LRU is one possibility that
> reclaim may be slow, there is also the problem of too many pages being
> isolated and reclaim failing for other reasons (elevated references,
> too many pages isolated, excessive LRU contention etc).
> 

Don't send series after taking time off. This is the completely wrong
set of patches, it's v1 again, sorry. I'll fix up a v3.

-- 
Mel Gorman
SUSE Labs