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From:   Shakeel Butt <shakeelb@google.com>
Date:   Thu, 5 May 2022 12:33:08 -0700
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Subject: Re: [PATCH 4/5] mm: zswap: add basic meminfo and vmstat coverage
To:     Yang Shi <shy828301@gmail.com>,
        Suleiman Souhlal <suleiman@google.com>
Cc:     Johannes Weiner <hannes@cmpxchg.org>,
        Minchan Kim <minchan@kernel.org>,
        Andrew Morton <akpm@linux-foundation.org>,
        Michal Hocko <mhocko@suse.com>, Roman Gushchin <guro@fb.com>,
        Seth Jennings <sjenning@redhat.com>,
        Dan Streetman <ddstreet@ieee.org>,
        Linux MM <linux-mm@kvack.org>,
        Cgroups <cgroups@vger.kernel.org>,
        LKML <linux-kernel@vger.kernel.org>,
        Kernel Team <kernel-team@fb.com>
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On Thu, Apr 28, 2022 at 9:54 AM Yang Shi <shy828301@gmail.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).