2022-06-01 20:25:33

by Diederik de Haas

[permalink] [raw]
Subject: ZSWAP still considered experimental?

In https://bugs.debian.org/970639 the request was made to enable ZSWAP.

Upon it was (rightly) noted that zswap.rst contained this:
> Zswap is a new feature as of v3.11 and interacts heavily with memory
> reclaim. This interaction has not been fully explored on the large set
> of potential configurations and workloads that exist. For this reason,
> zswap is a work in progress and should be considered experimental.

Furthermore the mm/Kconfig contains this on the ZSWAP option:
> Compressed cache for swap pages (EXPERIMENTAL)

But the contents of that zswap.rst hasn't changed since the initial commit
61b0d76017a50c263c303fa263b295b04e0c68f6 from 2013-07-11.

Similarly, that line in Kconfig hasn't changed either since the initial commit
2b2811178e85553405b86e3fe78357b9b95889ce from 2013-07-11.

Should ZSWAP should still be considered experimental or not?

Regards,
Diederik


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2022-06-01 20:52:44

by Andrew Morton

[permalink] [raw]
Subject: Re: ZSWAP still considered experimental?

On Tue, 31 May 2022 10:41:05 +0200 Diederik de Haas <[email protected]> wrote:

> In https://bugs.debian.org/970639 the request was made to enable ZSWAP.
>
> Upon it was (rightly) noted that zswap.rst contained this:
> > Zswap is a new feature as of v3.11 and interacts heavily with memory
> > reclaim. This interaction has not been fully explored on the large set
> > of potential configurations and workloads that exist. For this reason,
> > zswap is a work in progress and should be considered experimental.
>
> Furthermore the mm/Kconfig contains this on the ZSWAP option:
> > Compressed cache for swap pages (EXPERIMENTAL)
>
> But the contents of that zswap.rst hasn't changed since the initial commit
> 61b0d76017a50c263c303fa263b295b04e0c68f6 from 2013-07-11.
>
> Similarly, that line in Kconfig hasn't changed either since the initial commit
> 2b2811178e85553405b86e3fe78357b9b95889ce from 2013-07-11.
>
> Should ZSWAP should still be considered experimental or not?

I'd say "not".