From: Luigi Semenzato <semenzato@google.com>
To: Michal Hocko <mhocko@kernel.org>
Cc: Linux Memory Management List <linux-mm@kvack.org>,
linux-kernel <linux-kernel@vger.kernel.org>,
"Rafael J. Wysocki" <rafael@kernel.org>,
Andrew Morton <akpm@linux-foundation.org>,
Geoff Pike <gpike@google.com>
Subject: Re: [PATCH 1/2] Documentation: clarify limitations of hibernation
Date: Mon, 27 Jan 2020 08:13:21 -0800 [thread overview]
Message-ID: <CAA25o9QuA_9EoivWo-DuJsWoHCdBm2wio3G8JYxuTfQErT42kg@mail.gmail.com> (raw)
In-Reply-To: <20200127141637.GL1183@dhcp22.suse.cz>
On Mon, Jan 27, 2020 at 6:16 AM Michal Hocko <mhocko@kernel.org> wrote:
>
> On Fri 24-01-20 08:37:12, Luigi Semenzato wrote:
> [...]
> > The purpose of my documentation patch was to make it clearer that
> > hibernation may fail in situations in which suspend-to-RAM works; for
> > instance, when there is no swap, and anonymous pages are over 50% of
> > total RAM. I will send a new version of the patch which hopefully
> > makes this clearer.
>
> I was under impression that s2disk is pretty much impossible without any
> swap.
I am not sure what you mean by "swap" here. S2disk needs a swap
partition for storing the image, but that partition is not used for
regular swap. If there is no swap, but more than 50% of RAM is free
or reclaimable, s2disk works fine. If anonymous is more than 50%,
hibernation can still work, but swap needs to be set up (in addition
to the space for the hibernation image). The setup is not obvious and
I don't think that the documentation is clear on this.
> --
> Michal Hocko
> SUSE Labs
next prev parent reply other threads:[~2020-01-27 16:13 UTC|newest]
Thread overview: 17+ messages / expand[flat|nested] mbox.gz Atom feed top
2019-12-26 22:02 [PATCH 0/2] clarify limitations of hibernation Luigi Semenzato
2019-12-26 22:02 ` [PATCH 1/2] Documentation: " Luigi Semenzato
2020-01-06 12:53 ` Michal Hocko
2020-01-06 19:08 ` Luigi Semenzato
2020-01-08 11:49 ` Michal Hocko
2020-01-24 16:37 ` Luigi Semenzato
2020-01-27 14:16 ` Michal Hocko
2020-01-27 16:13 ` Luigi Semenzato [this message]
2020-01-27 16:28 ` Rafael J. Wysocki
2020-01-27 17:21 ` Luigi Semenzato
2020-01-30 20:50 ` Rafael J. Wysocki
2020-01-30 21:10 ` Luigi Semenzato
2020-01-30 21:29 ` Rafael J. Wysocki
2020-01-30 21:36 ` Luigi Semenzato
2020-01-27 16:14 ` Rafael J. Wysocki
2020-01-07 10:04 ` Rafael J. Wysocki
2019-12-26 22:02 ` [PATCH 2/2] pm: add more logging on hibernation failure Luigi Semenzato
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