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From: Mel Gorman <mgorman@techsingularity.net>
To: Linux-MM <linux-mm@kvack.org>
Cc: NeilBrown <neilb@suse.de>, Theodore Ts'o <tytso@mit.edu>,
	Andreas Dilger <adilger.kernel@dilger.ca>,
	"Darrick J . Wong" <djwong@kernel.org>,
	Matthew Wilcox <willy@infradead.org>,
	Michal Hocko <mhocko@suse.com>,
	Dave Chinner <david@fromorbit.com>,
	Rik van Riel <riel@surriel.com>, Vlastimil Babka <vbabka@suse.cz>,
	Johannes Weiner <hannes@cmpxchg.org>,
	Jonathan Corbet <corbet@lwn.net>,
	Linux-fsdevel <linux-fsdevel@vger.kernel.org>,
	LKML <linux-kernel@vger.kernel.org>
Subject: Re: [PATCH 0/5] Remove dependency on congestion_wait in mm/ v2
Date: Wed, 29 Sep 2021 14:00:41 +0100	[thread overview]
Message-ID: <20210929130040.GJ3959@techsingularity.net> (raw)
In-Reply-To: <20210929100914.14704-1-mgorman@techsingularity.net>

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

      parent reply	other threads:[~2021-09-29 13:00 UTC|newest]

Thread overview: 7+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2021-09-29 10:09 Mel Gorman
2021-09-29 10:09 ` [PATCH 1/5] mm/vmscan: Throttle reclaim until some writeback completes if congested Mel Gorman
2021-09-29 10:09 ` [PATCH 2/5] mm/vmscan: Throttle reclaim and compaction when too may pages are isolated Mel Gorman
2021-09-29 10:09 ` [PATCH 3/5] mm/vmscan: Throttle reclaim when no progress is being made Mel Gorman
2021-09-29 10:09 ` [PATCH 4/5] mm/writeback: Throttle based on page writeback instead of congestion Mel Gorman
2021-09-29 10:09 ` [PATCH 5/5] mm/page_alloc: Remove the throttling logic from the page allocator Mel Gorman
2021-09-29 13:00 ` Mel Gorman [this message]

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