From: Yu Zhao <yuzhao@google.com>
To: Suleiman Souhlal <suleiman@google.com>, Yang Shi <shy828301@gmail.com>
Cc: Shakeel Butt <shakeelb@google.com>,
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>
Subject: Re: [PATCH 4/5] mm: zswap: add basic meminfo and vmstat coverage
Date: Thu, 5 May 2022 16:54:02 -0700 [thread overview]
Message-ID: <CAOUHufbnc3Q2qNd5f=SUgmzdSG6_c_ddZgDFEcxNajdSz=Ty3g@mail.gmail.com> (raw)
In-Reply-To: <CABCjUKAoTmqvyBbFH7A188s8Hwi1XbLgfb6znzgFOuRWBMBxig@mail.gmail.com>
On Thu, May 5, 2022 at 3:25 PM Suleiman Souhlal <suleiman@google.com> wrote:
>
> On Fri, May 6, 2022 at 4:33 AM Shakeel Butt <shakeelb@google.com> wrote:
> >
> > 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).
>
> 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.
Yes, it was a design choice. zswap was cache-like (tiering) and zram
was storage-like (endpoint). Though nowadays the distinction is
blurry.
It had nothing to do with zram being in staging -- when we took zswap,
it was out of the tree.
next prev parent reply other threads:[~2022-05-05 23:54 UTC|newest]
Thread overview: 34+ messages / expand[flat|nested] mbox.gz Atom feed top
2022-04-27 16:00 [PATCH 0/5] zswap: cgroup accounting & control Johannes Weiner
2022-04-27 16:00 ` [PATCH 1/5] mm: Kconfig: move swap and slab config options to the MM section Johannes Weiner
2022-04-27 16:00 ` [PATCH 2/5] mm: Kconfig: group swap, slab, hotplug and thp options into submenus Johannes Weiner
2022-04-27 16:00 ` [PATCH 3/5] mm: Kconfig: simplify zswap configuration Johannes Weiner
2022-04-27 16:00 ` [PATCH 4/5] mm: zswap: add basic meminfo and vmstat coverage Johannes Weiner
2022-04-27 18:36 ` Andrew Morton
2022-04-27 18:53 ` Johannes Weiner
2022-04-27 19:50 ` Johannes Weiner
2022-04-27 19:51 ` Johannes Weiner
2022-04-27 20:29 ` Minchan Kim
2022-04-27 21:20 ` Johannes Weiner
2022-04-27 21:36 ` Johannes Weiner
2022-04-27 22:12 ` Minchan Kim
2022-04-28 14:05 ` Johannes Weiner
2022-04-28 17:02 ` Minchan Kim
2022-04-28 17:27 ` Johannes Weiner
2022-04-27 23:36 ` Shakeel Butt
2022-04-28 14:36 ` Johannes Weiner
2022-04-28 14:49 ` Shakeel Butt
2022-04-28 15:16 ` Johannes Weiner
2022-04-28 16:59 ` Yang Shi
2022-05-05 19:30 ` Shakeel Butt
2022-04-28 16:54 ` Yang Shi
2022-05-05 19:33 ` Shakeel Butt
2022-05-05 22:24 ` Suleiman Souhlal
2022-05-05 23:54 ` Yu Zhao [this message]
2022-04-27 22:16 ` Minchan Kim
2022-04-28 14:25 ` Johannes Weiner
2022-04-28 16:59 ` Minchan Kim
2022-04-28 17:23 ` Johannes Weiner
2022-04-28 17:31 ` Minchan Kim
2022-04-28 18:34 ` Johannes Weiner
2022-04-28 19:58 ` Minchan Kim
2022-04-27 16:00 ` [PATCH 5/5] zswap: memcg accounting Johannes Weiner
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