linux-kernel - Re: [PATCH v17 08/10] PM: hibernate: disable when there are active secretmem users

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Date:   Mon, 8 Feb 2021 14:34:37 +0100
From:   Michal Hocko <mhocko@...e.com>
To:     David Hildenbrand <david@...hat.com>
Cc:     Mike Rapoport <rppt@...nel.org>,
        Andrew Morton <akpm@...ux-foundation.org>,
        Alexander Viro <viro@...iv.linux.org.uk>,
        Andy Lutomirski <luto@...nel.org>,
        Arnd Bergmann <arnd@...db.de>, Borislav Petkov <bp@...en8.de>,
        Catalin Marinas <catalin.marinas@....com>,
        Christopher Lameter <cl@...ux.com>,
        Dan Williams <dan.j.williams@...el.com>,
        Dave Hansen <dave.hansen@...ux.intel.com>,
        Elena Reshetova <elena.reshetova@...el.com>,
        "H. Peter Anvin" <hpa@...or.com>, Ingo Molnar <mingo@...hat.com>,
        James Bottomley <jejb@...ux.ibm.com>,
        "Kirill A. Shutemov" <kirill@...temov.name>,
        Matthew Wilcox <willy@...radead.org>,
        Mark Rutland <mark.rutland@....com>,
        Mike Rapoport <rppt@...ux.ibm.com>,
        Michael Kerrisk <mtk.manpages@...il.com>,
        Palmer Dabbelt <palmer@...belt.com>,
        Paul Walmsley <paul.walmsley@...ive.com>,
        Peter Zijlstra <peterz@...radead.org>,
        Rick Edgecombe <rick.p.edgecombe@...el.com>,
        Roman Gushchin <guro@...com>,
        Shakeel Butt <shakeelb@...gle.com>,
        Shuah Khan <shuah@...nel.org>,
        Thomas Gleixner <tglx@...utronix.de>,
        Tycho Andersen <tycho@...ho.ws>, Will Deacon <will@...nel.org>,
        linux-api@...r.kernel.org, linux-arch@...r.kernel.org,
        linux-arm-kernel@...ts.infradead.org,
        linux-fsdevel@...r.kernel.org, linux-mm@...ck.org,
        linux-kernel@...r.kernel.org, linux-kselftest@...r.kernel.org,
        linux-nvdimm@...ts.01.org, linux-riscv@...ts.infradead.org,
        x86@...nel.org, Hagen Paul Pfeifer <hagen@...u.net>,
        Palmer Dabbelt <palmerdabbelt@...gle.com>,
        "Rafael J. Wysocki" <rjw@...ysocki.net>
Subject: Re: [PATCH v17 08/10] PM: hibernate: disable when there are active
 secretmem users

Btw. I do not see Rafael involved. Maybe he can add some insight to
this. Please note that the patch in question is
http://lkml.kernel.org/r/20210208084920.2884-9-rppt@kernel.org and
the full series is http://lkml.kernel.org/r/20210208084920.2884-1-rppt@kernel.org

On Mon 08-02-21 13:17:26, Michal Hocko wrote:
> On Mon 08-02-21 12:26:31, David Hildenbrand wrote:
> [...]
> > My F33 system happily hibernates to disk, even with an application that
> > succeeded in din doing an mlockall().
> > 
> > And it somewhat makes sense. Even my freshly-booted, idle F33 has
> > 
> > $ cat /proc/meminfo  | grep lock
> > Mlocked:            4860 kB
> > 
> > So, stopping to hibernate with mlocked memory would essentially prohibit any
> > modern Linux distro to hibernate ever.
> 
> My system seems to be completely fine without mlocked memory. It would
> be interesting to see who mlocks memory on your system and check whether
> the expectated mlock semantic really works for those. This should be
> documented at least.
> -- 
> Michal Hocko
> SUSE Labs

-- 
Michal Hocko
SUSE Labs