linux-kernel - Re: [PATCH -next v6 2/2] mm/zswap: delay the initializaton of zswap

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Date:   Thu, 23 Mar 2023 08:59:27 +0100
From:   Christoph Hellwig <hch@....de>
To:     Vitaly Wool <vitaly.wool@...sulko.com>
Cc:     Liu Shixin <liushixin2@...wei.com>,
        Seth Jennings <sjenning@...hat.com>,
        Dan Streetman <ddstreet@...e.org>,
        Andrew Morton <akpm@...ux-foundation.org>,
        Nathan Chancellor <nathan@...nel.org>,
        Christoph Hellwig <hch@....de>, linux-kernel@...r.kernel.org,
        linux-mm@...ck.org
Subject: Re: [PATCH -next v6 2/2] mm/zswap: delay the initializaton of zswap

On Wed, Mar 22, 2023 at 06:17:12PM +0100, Vitaly Wool wrote:
> On Wed, Mar 22, 2023 at 10:30 AM Liu Shixin <liushixin2@...wei.com> wrote:
> >
> > Since some users may not use zswap, the zswap_pool is wasted. Save memory
> > by delaying the initialization of zswap until enabled.
> 
> To be honest, I'm not a huge fan of this. Would enabling zswap module
> build instead solve your problem?

making zswap build modular would be a mess.  It is core MM infrastructure
and now we'd need to start dealing with adding and removing it at
runtime as well as module refcounting.