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From: David Hildenbrand <david@redhat.com>
To: Michal Hocko <mhocko@suse.com>
Cc: Mike Rapoport <rppt@kernel.org>,
	Andrew Morton <akpm@linux-foundation.org>,
	Alexander Viro <viro@zeniv.linux.org.uk>,
	Andy Lutomirski <luto@kernel.org>, Arnd Bergmann <arnd@arndb.de>,
	Borislav Petkov <bp@alien8.de>,
	Catalin Marinas <catalin.marinas@arm.com>,
	Christopher Lameter <cl@linux.com>,
	Dan Williams <dan.j.williams@intel.com>,
	Dave Hansen <dave.hansen@linux.intel.com>,
	Elena Reshetova <elena.reshetova@intel.com>,
	"H. Peter Anvin" <hpa@zytor.com>, Ingo Molnar <mingo@redhat.com>,
	James Bottomley <jejb@linux.ibm.com>,
	"Kirill A. Shutemov" <kirill@shutemov.name>,
	Matthew Wilcox <willy@infradead.org>,
	Mark Rutland <mark.rutland@arm.com>,
	Mike Rapoport <rppt@linux.ibm.com>,
	Michael Kerrisk <mtk.manpages@gmail.com>,
	Palmer Dabbelt <palmer@dabbelt.com>,
	Paul Walmsley <paul.walmsley@sifive.com>,
	Peter Zijlstra <peterz@infradead.org>,
	Rick Edgecombe <rick.p.edgecombe@intel.com>,
	Roman Gushchin <guro@fb.com>, Shakeel Butt <shakeelb@google.com>,
	Shuah Khan <shuah@kernel.org>,
	Thomas Gleixner <tglx@linutronix.de>,
	Tycho Andersen <tycho@tycho.ws>, Will Deacon <will@kernel.org>,
	linux-api@vger.kernel.org, linux-arch@vger.kernel.org,
	linux-arm-kernel@lists.infradead.org,
	linux-fsdevel@vger.kernel.org, linux-mm@kvack.org,
	linux-kernel@vger.kernel.org, linux-kselftest@vger.kernel.org,
	linux-nvdimm@lists.01.org, linux-riscv@lists.infradead.org,
	x86@kernel.org, Hagen Paul Pfeifer <hagen@jauu.net>,
	Palmer Dabbelt <palmerdabbelt@google.com>
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


  parent reply	other threads:[~2021-02-08 13:44 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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