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charset="utf-8"; protected-headers="v1" From: Jonas =?ISO-8859-1?Q?Sch=E4fer?= To: linux-mm@kvack.org Subject: About swapaccount= Date: Thu, 02 Mar 2023 20:01:01 +0100 Message-ID: <2593755.Xrv9ptJ69j@sinistra.local> Mime-Version: 1.0 Hi there, By coincidence, I found this log message in my kernel logs: M=C3=A4r 02 17:23:19 sinistra kernel: The swapaccount=3D commandline option= is=20 deprecated. Please report your usecase to linux-mm@kvack.org if you depend = on=20 this functionality. My usecase does depend on this in the following way: I use LXC extensively to isolate workloads from one another. Kind of like=20 docker, but with full operating systems inside. Before I found out about swapaccount, I often ran into the issue that one=20 misbehaving workload from one of those containers would bring the entire=20 machine to a halt because it occupied lots of swap, and thus triggered=20 significant slowdown. With swapaccount, I limit swap to about 10% of the RAM assigned to the=20 containers. This allows them to swap out unused stuff, but invokes the OOM= =20 killer before any significant slowdown happens. The alternative would be to turn off swap for the system entirely, but it i= s=20 running fairly efficiently thanks to swapping stuff out. I'd be interested to hear about alternatives. Thanks for hearing me, anyway. kind regards, Jonas Sch=C3=A4fer --nextPart17128814.zNqzOAkdRA Content-Type: application/pgp-signature; name="signature.asc" Content-Description: This is a digitally signed message part. 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