From: David Hildenbrand <david@redhat.com>
To: Michal Hocko <mhocko@suse.com>
Cc: Mark Rutland <mark.rutland@arm.com>,
Peter Zijlstra <peterz@infradead.org>,
Catalin Marinas <catalin.marinas@arm.com>,
Dave Hansen <dave.hansen@linux.intel.com>,
linux-mm@kvack.org, linux-kselftest@vger.kernel.org,
"H. Peter Anvin" <hpa@zytor.com>,
Christopher Lameter <cl@linux.com>, Shuah Khan <shuah@kernel.org>,
Thomas Gleixner <tglx@linutronix.de>,
Elena Reshetova <elena.reshetova@intel.com>,
linux-arch@vger.kernel.org, Tycho Andersen <tycho@tycho.ws>,
linux-nvdimm@lists.01.org, Will Deacon <will@kernel.org>,
x86@kernel.org, Matthew Wilcox <willy@infradead.org>,
Mike Rapoport <rppt@linux.ibm.com>,
Ingo Molnar <mingo@redhat.com>,
Michael Kerrisk <mtk.manpages@gmail.com>,
Palmer Dabbelt <palmerdabbelt@google.com>,
Arnd Bergmann <arnd@arndb.de>,
James Bottomley <jejb@linux.ibm.com>,
Hagen Paul Pfeifer <hagen@jauu.net>,
Borislav Petkov <bp@alien8.de>,
Alexander Viro <viro@zeniv.linux.org.uk>,
Andy Lutomirski <luto@kernel.org>,
Paul Walmsley <paul.walmsley@sifive.com>,
"Kirill A. Shutemov" <kirill@shutemov.name>,
Dan Williams <dan.j.williams@intel.com>,
linux-arm-kernel@lists.infradead.org, linux-api@vger.kernel.org,
linux-kernel@vger.kernel.org, linux-riscv@lists.infradead.org,
Palmer Dabbelt <palmer@dabbelt.com>,
linux-fsdevel@vger.kernel.org, Shakeel Butt <shakeelb@google.com>,
Andrew Morton <akpm@linux-foundation.org>,
Rick Edgecombe <rick.p.edgecombe@intel.com>,
Roman Gushchin <guro@fb.com>, Mike Rapoport <rppt@kernel.org>
Subject: Re: [PATCH v17 08/10] PM: hibernate: disable when there are active secretmem users
Date: Mon, 8 Feb 2021 14:40:42 +0100 [thread overview]
Message-ID: <f822a203-f7ec-8b97-b88d-1bf6bffa93d8@redhat.com> (raw)
In-Reply-To: <YCEr1JS8k/nDbcVR@dhcp22.suse.cz>
On 08.02.21 13:17, 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.
I checked some other installations (Ubuntu, RHEL), and they also show no
sign of Mlock. My notebook (F33) and desktop (F33) both have mlocked
memory. Either related to F33 or due to some software (e.g., kerberos).
--
Thanks,
David / dhildenb
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next prev parent reply other threads:[~2021-02-08 13:42 UTC|newest]
Thread overview: 73+ messages / expand[flat|nested] mbox.gz Atom feed top
2021-02-08 8:49 [PATCH v17 00/10] mm: introduce memfd_secret system call to create "secret" memory areas Mike Rapoport
2021-02-08 8:49 ` [PATCH v17 01/10] mm: add definition of PMD_PAGE_ORDER Mike Rapoport
2021-02-08 8:49 ` [PATCH v17 02/10] mmap: make mlock_future_check() global Mike Rapoport
2021-02-08 8:49 ` [PATCH v17 03/10] riscv/Kconfig: make direct map manipulation options depend on MMU Mike Rapoport
2021-02-08 8:49 ` [PATCH v17 04/10] set_memory: allow set_direct_map_*_noflush() for multiple pages Mike Rapoport
2021-02-08 8:49 ` [PATCH v17 05/10] set_memory: allow querying whether set_direct_map_*() is actually enabled Mike Rapoport
2021-02-08 8:49 ` [PATCH v17 06/10] arm64: kfence: fix header inclusion Mike Rapoport
2021-02-08 8:49 ` [PATCH v17 07/10] mm: introduce memfd_secret system call to create "secret" memory areas Mike Rapoport
2021-02-08 10:49 ` Michal Hocko
2021-02-08 21:26 ` Mike Rapoport
2021-02-09 8:47 ` Michal Hocko
2021-02-09 9:09 ` Mike Rapoport
2021-02-09 13:17 ` Michal Hocko
2021-02-11 7:13 ` Mike Rapoport
2021-02-11 8:39 ` Michal Hocko
2021-02-11 9:01 ` David Hildenbrand
2021-02-11 9:38 ` Michal Hocko
2021-02-11 9:48 ` David Hildenbrand
2021-02-11 10:02 ` David Hildenbrand
2021-02-11 11:29 ` Mike Rapoport
2021-02-11 11:27 ` Mike Rapoport
2021-02-11 12:07 ` David Hildenbrand
2021-02-11 23:09 ` Mike Rapoport
2021-02-12 9:18 ` David Hildenbrand
2021-02-14 9:19 ` Mike Rapoport
2021-02-14 9:58 ` David Hildenbrand
2021-02-14 19:21 ` James Bottomley
2021-02-15 9:13 ` Michal Hocko
2021-02-15 18:14 ` James Bottomley
2021-02-15 19:20 ` Michal Hocko
2021-02-16 16:25 ` James Bottomley
2021-02-16 16:34 ` David Hildenbrand
2021-02-16 16:44 ` James Bottomley
2021-02-16 17:16 ` David Hildenbrand
2021-02-17 16:19 ` James Bottomley
2021-02-22 9:38 ` David Hildenbrand
2021-02-22 10:50 ` David Hildenbrand
2021-02-16 16:51 ` Michal Hocko
2021-02-11 11:20 ` Mike Rapoport
2021-02-11 12:30 ` Michal Hocko
2021-02-11 22:59 ` Mike Rapoport
2021-02-12 9:02 ` Michal Hocko
2021-02-08 8:49 ` [PATCH v17 08/10] PM: hibernate: disable when there are active secretmem users Mike Rapoport
2021-02-08 10:18 ` Michal Hocko
2021-02-08 10:32 ` David Hildenbrand
2021-02-08 10:51 ` Michal Hocko
2021-02-08 10:53 ` David Hildenbrand
2021-02-08 10:57 ` Michal Hocko
2021-02-08 11:13 ` David Hildenbrand
2021-02-08 11:14 ` David Hildenbrand
2021-02-08 11:26 ` David Hildenbrand
2021-02-08 12:17 ` Michal Hocko
2021-02-08 13:34 ` Michal Hocko
2021-02-08 13:40 ` David Hildenbrand [this message]
2021-02-08 21:28 ` Mike Rapoport
2021-02-22 7:34 ` Matthew Garrett
2021-02-22 10:23 ` Mike Rapoport
2021-02-22 18:27 ` Matthew Garrett
2021-02-22 19:17 ` Dan Williams
2021-02-22 19:21 ` James Bottomley
2021-02-08 8:49 ` [PATCH v17 09/10] arch, mm: wire up memfd_secret system call where relevant Mike Rapoport
2021-02-08 8:49 ` [PATCH v17 10/10] secretmem: test: add basic selftest for memfd_secret(2) Mike Rapoport
2021-02-08 9:27 ` [PATCH v17 00/10] mm: introduce memfd_secret system call to create "secret" memory areas David Hildenbrand
2021-02-08 21:13 ` Mike Rapoport
2021-02-08 21:38 ` David Hildenbrand
2021-02-09 8:59 ` Michal Hocko
2021-02-09 9:15 ` David Hildenbrand
2021-02-09 9:53 ` Michal Hocko
2021-02-09 10:23 ` David Hildenbrand
2021-02-09 10:30 ` David Hildenbrand
2021-02-09 13:25 ` Michal Hocko
2021-02-09 16:17 ` David Hildenbrand
2021-02-09 20:08 ` Michal Hocko
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