From: Matthew Wilcox <willy@infradead.org>
To: Mel Gorman <mgorman@techsingularity.net>
Cc: Linux-MM <linux-mm@kvack.org>, NeilBrown <neilb@suse.de>,
Theodore Ts'o <tytso@mit.edu>,
Andreas Dilger <adilger.kernel@dilger.ca>,
"Darrick J . Wong" <djwong@kernel.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: [RFC PATCH 0/5] Remove dependency on congestion_wait in mm/
Date: Mon, 20 Sep 2021 12:42:44 +0100 [thread overview]
Message-ID: <YUhztA8TmplTluyQ@casper.infradead.org> (raw)
In-Reply-To: <20210920085436.20939-1-mgorman@techsingularity.net>
On Mon, Sep 20, 2021 at 09:54:31AM +0100, Mel Gorman wrote:
> This has been lightly tested only and the testing was useless as the
> relevant code was not executed. The workload configurations I had that
> used to trigger these corner cases no longer work (yey?) and I'll need
> to implement a new synthetic workload. If someone is aware of a realistic
> workload that forces reclaim activity to the point where reclaim stalls
> then kindly share the details.
The stereeotypical "stalling on I/O" problem is to plug in one of the
crap USB drives you were given at a trade show and simply
dd if=/dev/zero of=/dev/sdb
sync
You can also set up qemu to have extremely slow I/O performance:
https://serverfault.com/questions/675704/extremely-slow-qemu-storage-performance-with-qcow2-images
next prev parent reply other threads:[~2021-09-20 11:44 UTC|newest]
Thread overview: 29+ messages / expand[flat|nested] mbox.gz Atom feed top
2021-09-20 8:54 [RFC PATCH 0/5] Remove dependency on congestion_wait in mm/ Mel Gorman
2021-09-20 8:54 ` [PATCH 1/5] mm/vmscan: Throttle reclaim until some writeback completes if congested Mel Gorman
2021-09-20 23:19 ` NeilBrown
2021-09-21 11:12 ` Mel Gorman
2021-09-21 21:27 ` NeilBrown
2021-09-21 0:13 ` NeilBrown
2021-09-21 10:58 ` Mel Gorman
2021-09-21 21:40 ` NeilBrown
2021-09-22 6:04 ` Dave Chinner
2021-09-22 8:03 ` Mel Gorman
2021-09-20 8:54 ` [PATCH 2/5] mm/vmscan: Throttle reclaim and compaction when too may pages are isolated Mel Gorman
2021-09-20 23:27 ` NeilBrown
2021-09-21 11:03 ` Mel Gorman
2021-09-21 18:45 ` Yang Shi
2021-09-22 8:11 ` Mel Gorman
2021-09-20 8:54 ` [PATCH 3/5] mm/vmscan: Throttle reclaim when no progress is being made Mel Gorman
2021-09-20 23:31 ` NeilBrown
2021-09-21 11:16 ` Mel Gorman
2021-09-21 21:46 ` NeilBrown
2021-09-22 9:21 ` Mel Gorman
2021-09-20 8:54 ` [PATCH 4/5] mm/writeback: Throttle based on page writeback instead of congestion Mel Gorman
2021-09-20 8:54 ` [PATCH 5/5] mm/page_alloc: Remove the throttling logic from the page allocator Mel Gorman
2021-09-20 11:42 ` Matthew Wilcox [this message]
2021-09-20 12:50 ` [RFC PATCH 0/5] Remove dependency on congestion_wait in mm/ Mel Gorman
2021-09-20 14:11 ` David Sterba
2021-09-21 11:18 ` Mel Gorman
2021-09-20 19:51 ` Mel Gorman
2021-09-21 20:46 ` Dave Chinner
2021-09-22 17:52 ` Mel Gorman
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