linux-kernel - Re: [PATCH] Revert "exec: make de_thread() freezable (was: Re: Linux 4.20-rc4)

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Message-ID: <20181204091020.GD1286@dhcp22.suse.cz>
Date:   Tue, 4 Dec 2018 10:10:20 +0100
From:   Michal Hocko <mhocko@...nel.org>
To:     Ingo Molnar <mingo@...nel.org>
Cc:     Pavel Machek <pavel@....cz>, Oleg Nesterov <oleg@...hat.com>,
        Linus Torvalds <torvalds@...ux-foundation.org>,
        Linux List Kernel Mailing <linux-kernel@...r.kernel.org>,
        "Rafael J. Wysocki" <rafael.j.wysocki@...el.com>,
        Chanho Min <chanho.min@....com>,
        Thomas Gleixner <tglx@...utronix.de>,
        Peter Zijlstra <a.p.zijlstra@...llo.nl>
Subject: Re: [PATCH] Revert "exec: make de_thread() freezable (was: Re: Linux
 4.20-rc4)

On Tue 04-12-18 10:02:28, Ingo Molnar wrote:
> 
> * Michal Hocko <mhocko@...nel.org> wrote:
> 
> > > Do we actually have reports of this happening for people outside
> > > Android?
> > 
> > Not that I am aware of.
> 
> I'd say outside of Android 99% of the use of hibernation is the fail-safe 
> that distributions offer on laptops with very low battery levels: the 
> emergency hibernation when there's almost no power left anymore.
> 
> Do these hibernation failure messages typically make it to persistent 
> logs before the system uses power?

I dunno. I do not use hibernation. I am a heavy user of the suspend
though. I s2ram all the time. And I have certainly experienced cases
where suspend has failed and I onlyi found out later when I've picked up
my laptop from my heat up bag. Nothing fatal has resulted from that but
this is certainly annoying.
-- 
Michal Hocko
SUSE Labs