linux-kernel - Re: [regression -next0117] What is kcompactd and why is he eating 100% of my cpu?

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Message-ID: <35445.1613514794@turing-police>
Date:   Tue, 16 Feb 2021 17:33:14 -0500
From:   "Valdis Klētnieks" <valdis.kletnieks@...edu>
To:     "Jason A. Donenfeld" <Jason@...c4.com>
Cc:     Tibor Bana <bana.tibor@...il.com>,
        Mel Gorman <mgorman@...hsingularity.net>,
        Jan Kara <jack@...e.cz>, Pavel Machek <pavel@....cz>,
        kernel list <linux-kernel@...r.kernel.org>,
        Andrew Morton <akpm@...l.org>, vbabka@...e.cz,
        aarcange@...hat.com, rientjes@...gle.com, mhocko@...nel.org,
        zi.yan@...rutgers.edu, hannes@...xchg.org
Subject: Re: [regression -next0117] What is kcompactd and why is he eating 100% of my cpu?

On Tue, 16 Feb 2021 13:36:22 +0100, "Jason A. Donenfeld" said:

> Another anecdote: 5.11.0, 64 gigs of ram. If I run QEMU/KVM for a VM
> with 16 gigs at the same time as a VMware VM with 16 gigs of ram,
> kcompact goes wild and both VMs get really slow. The key here is running
> KVM at the same time as VMware.

Do things operated as expected if there are 2 KVM instances, or 2 VMware
instances?


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