linux-kernel - Re: [PATCH 5/8] mm/page_alloc: Remove the throttling logic from the page allocator

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Message-ID: <2d3d2636-a8ba-4aa1-e7f7-1a00bd7eb097@suse.cz>
Date:   Tue, 19 Oct 2021 11:20:52 +0200
From:   Vlastimil Babka <vbabka@...e.cz>
To:     Mel Gorman <mgorman@...hsingularity.net>,
        Andrew Morton <akpm@...ux-foundation.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>,
        Johannes Weiner <hannes@...xchg.org>,
        Jonathan Corbet <corbet@....net>,
        Linux-MM <linux-mm@...ck.org>,
        Linux-fsdevel <linux-fsdevel@...r.kernel.org>,
        LKML <linux-kernel@...r.kernel.org>
Subject: Re: [PATCH 5/8] mm/page_alloc: Remove the throttling logic from the
 page allocator

On 10/19/21 11:01, Mel Gorman wrote:
> The page allocator stalls based on the number of pages that are
> waiting for writeback to start but this should now be redundant.
> shrink_inactive_list() will wake flusher threads if the LRU tail are
> unqueued dirty pages so the flusher should be active. If it fails to make
> progress due to pages under writeback not being completed quickly then
> it should stall on VMSCAN_THROTTLE_WRITEBACK.
> 
> Signed-off-by: Mel Gorman <mgorman@...hsingularity.net>

Acked-by: Vlastimil Babka <vbabka@...e.cz>

(did in v3 already)