linux-kernel - Re: [PATCH 4/5] mm: zswap: add basic meminfo and vmstat coverage

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Date:   Fri, 6 May 2022 07:24:51 +0900
From:   Suleiman Souhlal <suleiman@...gle.com>
To:     Shakeel Butt <shakeelb@...gle.com>
Cc:     Yang Shi <shy828301@...il.com>,
        Johannes Weiner <hannes@...xchg.org>,
        Minchan Kim <minchan@...nel.org>,
        Andrew Morton <akpm@...ux-foundation.org>,
        Michal Hocko <mhocko@...e.com>, Roman Gushchin <guro@...com>,
        Seth Jennings <sjenning@...hat.com>,
        Dan Streetman <ddstreet@...e.org>,
        Linux MM <linux-mm@...ck.org>,
        Cgroups <cgroups@...r.kernel.org>,
        LKML <linux-kernel@...r.kernel.org>,
        Kernel Team <kernel-team@...com>
Subject: Re: [PATCH 4/5] mm: zswap: add basic meminfo and vmstat coverage

On Fri, May 6, 2022 at 4:33 AM Shakeel Butt <shakeelb@...gle.com> wrote:
>
> On Thu, Apr 28, 2022 at 9:54 AM Yang Shi <shy828301@...il.com> wrote:
> >
> [...]
> > > Yes, we have some modifications to zswap to make it work without any
> > > backing real swap. Though there is a future plan to move to zram
> > > eventually.
> >
> > Interesting, if so why not just simply use zram?
> >
>
> Historical reasons. When we started trying out the zswap, I think zram
> was still in staging or not stable enough (Suleiman can give a better
> answer).

One of the reasons we chose zswap instead of zram is that zswap can
reject pages.
Also, we wanted to have per-memcg pools, which zswap made much easier to do.

-- Suleiman