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From: Mike Rapoport <rppt@kernel.org>
To: David Hildenbrand <david@redhat.com>
Cc: 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>,
	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>,
	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.ker nel.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
Subject: Re: [PATCH v8 2/9] mmap: make mlock_future_check() global
Date: Tue, 17 Nov 2020 17:58:29 +0200	[thread overview]
Message-ID: <20201117155829.GJ370813@kernel.org> (raw)
In-Reply-To: <d47fdd2e-a8fa-6792-ca8f-e529be76340c@redhat.com>

On Tue, Nov 17, 2020 at 04:09:39PM +0100, David Hildenbrand wrote:
> On 15.11.20 09:26, Mike Rapoport wrote:
> > On Thu, Nov 12, 2020 at 09:15:18PM +0100, David Hildenbrand wrote:

...

> > My thinking was that since secretmem does what mlock() does wrt
> > swapability, it should at least obey the same limit, i.e.
> > RLIMIT_MEMLOCK.
> 
> Right, but at least currently, it behaves like any other CMA allocation
> (IIRC they are all unmovable and, therefore, not swappable). In the future,
> if pages would be movable (but not swappable), I guess it might makes more
> sense. I assume we never ever want to swap secretmem.
> 
> "man getrlimit" states for RLIMIT_MEMLOCK:
> 
> "This is the maximum number of bytes of memory that may be
>  locked into RAM.  [...] This limit affects
>  mlock(2), mlockall(2), and the mmap(2) MAP_LOCKED operation.
>  Since Linux 2.6.9, it also affects the shmctl(2) SHM_LOCK op‐
>  eration [...]"
> 
> So that place has to be updated as well I guess? Otherwise this might come
> as a surprise for users.

Sure.

> > 
> > > E.g., we also don‘t
> > > account for gigantic pages - which might be allocated from CMA and are
> > > not swappable.
> > Do you mean gigantic pages in hugetlbfs?
> 
> Yes
> 
> > It seems to me that hugetlbfs accounting is a completely different
> > story.
> 
> I'd say it is right now comparable to secretmem - which is why I though
> similar accounting would make sense.

IMHO, using RLIMIT_MEMLOCK and memcg is a more straightforward way than
a custom cgroup.

And if we'll see a need for additional mechanism, we can always add it.
 
> -- 
> Thanks,
> 
> David / dhildenb
> 
> 

-- 
Sincerely yours,
Mike.
_______________________________________________
Linux-nvdimm mailing list -- linux-nvdimm@lists.01.org
To unsubscribe send an email to linux-nvdimm-leave@lists.01.org

WARNING: multiple messages have this Message-ID (diff)
From: Mike Rapoport <rppt@kernel.org>
To: David Hildenbrand <david@redhat.com>
Cc: 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>,
	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
Subject: Re: [PATCH v8 2/9] mmap: make mlock_future_check() global
Date: Tue, 17 Nov 2020 17:58:29 +0200	[thread overview]
Message-ID: <20201117155829.GJ370813@kernel.org> (raw)
In-Reply-To: <d47fdd2e-a8fa-6792-ca8f-e529be76340c@redhat.com>

On Tue, Nov 17, 2020 at 04:09:39PM +0100, David Hildenbrand wrote:
> On 15.11.20 09:26, Mike Rapoport wrote:
> > On Thu, Nov 12, 2020 at 09:15:18PM +0100, David Hildenbrand wrote:

...

> > My thinking was that since secretmem does what mlock() does wrt
> > swapability, it should at least obey the same limit, i.e.
> > RLIMIT_MEMLOCK.
> 
> Right, but at least currently, it behaves like any other CMA allocation
> (IIRC they are all unmovable and, therefore, not swappable). In the future,
> if pages would be movable (but not swappable), I guess it might makes more
> sense. I assume we never ever want to swap secretmem.
> 
> "man getrlimit" states for RLIMIT_MEMLOCK:
> 
> "This is the maximum number of bytes of memory that may be
>  locked into RAM.  [...] This limit affects
>  mlock(2), mlockall(2), and the mmap(2) MAP_LOCKED operation.
>  Since Linux 2.6.9, it also affects the shmctl(2) SHM_LOCK op‐
>  eration [...]"
> 
> So that place has to be updated as well I guess? Otherwise this might come
> as a surprise for users.

Sure.

> > 
> > > E.g., we also don‘t
> > > account for gigantic pages - which might be allocated from CMA and are
> > > not swappable.
> > Do you mean gigantic pages in hugetlbfs?
> 
> Yes
> 
> > It seems to me that hugetlbfs accounting is a completely different
> > story.
> 
> I'd say it is right now comparable to secretmem - which is why I though
> similar accounting would make sense.

IMHO, using RLIMIT_MEMLOCK and memcg is a more straightforward way than
a custom cgroup.

And if we'll see a need for additional mechanism, we can always add it.
 
> -- 
> Thanks,
> 
> David / dhildenb
> 
> 

-- 
Sincerely yours,
Mike.

WARNING: multiple messages have this Message-ID (diff)
From: Mike Rapoport <rppt@kernel.org>
To: David Hildenbrand <david@redhat.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>,
	Arnd Bergmann <arnd@arndb.de>,
	James Bottomley <jejb@linux.ibm.com>,
	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,
	Andrew Morton <akpm@linux-foundation.org>,
	Rick Edgecombe <rick.p.edgecombe@intel.com>
Subject: Re: [PATCH v8 2/9] mmap: make mlock_future_check() global
Date: Tue, 17 Nov 2020 17:58:29 +0200	[thread overview]
Message-ID: <20201117155829.GJ370813@kernel.org> (raw)
In-Reply-To: <d47fdd2e-a8fa-6792-ca8f-e529be76340c@redhat.com>

On Tue, Nov 17, 2020 at 04:09:39PM +0100, David Hildenbrand wrote:
> On 15.11.20 09:26, Mike Rapoport wrote:
> > On Thu, Nov 12, 2020 at 09:15:18PM +0100, David Hildenbrand wrote:

...

> > My thinking was that since secretmem does what mlock() does wrt
> > swapability, it should at least obey the same limit, i.e.
> > RLIMIT_MEMLOCK.
> 
> Right, but at least currently, it behaves like any other CMA allocation
> (IIRC they are all unmovable and, therefore, not swappable). In the future,
> if pages would be movable (but not swappable), I guess it might makes more
> sense. I assume we never ever want to swap secretmem.
> 
> "man getrlimit" states for RLIMIT_MEMLOCK:
> 
> "This is the maximum number of bytes of memory that may be
>  locked into RAM.  [...] This limit affects
>  mlock(2), mlockall(2), and the mmap(2) MAP_LOCKED operation.
>  Since Linux 2.6.9, it also affects the shmctl(2) SHM_LOCK op‐
>  eration [...]"
> 
> So that place has to be updated as well I guess? Otherwise this might come
> as a surprise for users.

Sure.

> > 
> > > E.g., we also don‘t
> > > account for gigantic pages - which might be allocated from CMA and are
> > > not swappable.
> > Do you mean gigantic pages in hugetlbfs?
> 
> Yes
> 
> > It seems to me that hugetlbfs accounting is a completely different
> > story.
> 
> I'd say it is right now comparable to secretmem - which is why I though
> similar accounting would make sense.

IMHO, using RLIMIT_MEMLOCK and memcg is a more straightforward way than
a custom cgroup.

And if we'll see a need for additional mechanism, we can always add it.
 
> -- 
> Thanks,
> 
> David / dhildenb
> 
> 

-- 
Sincerely yours,
Mike.

_______________________________________________
linux-riscv mailing list
linux-riscv@lists.infradead.org
http://lists.infradead.org/mailman/listinfo/linux-riscv

WARNING: multiple messages have this Message-ID (diff)
From: Mike Rapoport <rppt@kernel.org>
To: David Hildenbrand <david@redhat.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>,
	Arnd Bergmann <arnd@arndb.de>,
	James Bottomley <jejb@linux.ibm.com>,
	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,
	Andrew Morton <akpm@linux-foundation.org>,
	Rick Edgecombe <rick.p.edgecombe@intel.com>
Subject: Re: [PATCH v8 2/9] mmap: make mlock_future_check() global
Date: Tue, 17 Nov 2020 17:58:29 +0200	[thread overview]
Message-ID: <20201117155829.GJ370813@kernel.org> (raw)
In-Reply-To: <d47fdd2e-a8fa-6792-ca8f-e529be76340c@redhat.com>

On Tue, Nov 17, 2020 at 04:09:39PM +0100, David Hildenbrand wrote:
> On 15.11.20 09:26, Mike Rapoport wrote:
> > On Thu, Nov 12, 2020 at 09:15:18PM +0100, David Hildenbrand wrote:

...

> > My thinking was that since secretmem does what mlock() does wrt
> > swapability, it should at least obey the same limit, i.e.
> > RLIMIT_MEMLOCK.
> 
> Right, but at least currently, it behaves like any other CMA allocation
> (IIRC they are all unmovable and, therefore, not swappable). In the future,
> if pages would be movable (but not swappable), I guess it might makes more
> sense. I assume we never ever want to swap secretmem.
> 
> "man getrlimit" states for RLIMIT_MEMLOCK:
> 
> "This is the maximum number of bytes of memory that may be
>  locked into RAM.  [...] This limit affects
>  mlock(2), mlockall(2), and the mmap(2) MAP_LOCKED operation.
>  Since Linux 2.6.9, it also affects the shmctl(2) SHM_LOCK op‐
>  eration [...]"
> 
> So that place has to be updated as well I guess? Otherwise this might come
> as a surprise for users.

Sure.

> > 
> > > E.g., we also don‘t
> > > account for gigantic pages - which might be allocated from CMA and are
> > > not swappable.
> > Do you mean gigantic pages in hugetlbfs?
> 
> Yes
> 
> > It seems to me that hugetlbfs accounting is a completely different
> > story.
> 
> I'd say it is right now comparable to secretmem - which is why I though
> similar accounting would make sense.

IMHO, using RLIMIT_MEMLOCK and memcg is a more straightforward way than
a custom cgroup.

And if we'll see a need for additional mechanism, we can always add it.
 
> -- 
> Thanks,
> 
> David / dhildenb
> 
> 

-- 
Sincerely yours,
Mike.

_______________________________________________
linux-arm-kernel mailing list
linux-arm-kernel@lists.infradead.org
http://lists.infradead.org/mailman/listinfo/linux-arm-kernel

  reply	other threads:[~2020-11-17 15:58 UTC|newest]

Thread overview: 117+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2020-11-10 15:14 [PATCH v8 0/9] mm: introduce memfd_secret system call to create "secret" memory areas Mike Rapoport
2020-11-10 15:14 ` Mike Rapoport
2020-11-10 15:14 ` Mike Rapoport
2020-11-10 15:14 ` Mike Rapoport
2020-11-10 15:14 ` [PATCH v8 1/9] mm: add definition of PMD_PAGE_ORDER Mike Rapoport
2020-11-10 15:14   ` Mike Rapoport
2020-11-10 15:14   ` Mike Rapoport
2020-11-10 15:14   ` Mike Rapoport
2020-11-10 15:14 ` [PATCH v8 2/9] mmap: make mlock_future_check() global Mike Rapoport
2020-11-10 15:14   ` Mike Rapoport
2020-11-10 15:14   ` Mike Rapoport
2020-11-10 15:14   ` Mike Rapoport
2020-11-10 17:17   ` David Hildenbrand
2020-11-10 17:17     ` David Hildenbrand
2020-11-10 17:17     ` David Hildenbrand
2020-11-10 17:17     ` David Hildenbrand
2020-11-10 18:06     ` Mike Rapoport
2020-11-10 18:06       ` Mike Rapoport
2020-11-10 18:06       ` Mike Rapoport
2020-11-10 18:06       ` Mike Rapoport
2020-11-12 16:22       ` David Hildenbrand
2020-11-12 16:22         ` David Hildenbrand
2020-11-12 16:22         ` David Hildenbrand
2020-11-12 16:22         ` David Hildenbrand
2020-11-12 19:08         ` Mike Rapoport
2020-11-12 19:08           ` Mike Rapoport
2020-11-12 19:08           ` Mike Rapoport
2020-11-12 19:08           ` Mike Rapoport
2020-11-12 20:15           ` David Hildenbrand
2020-11-12 20:15             ` David Hildenbrand
2020-11-12 20:15             ` David Hildenbrand
2020-11-12 20:15             ` David Hildenbrand
2020-11-15  8:26             ` Mike Rapoport
2020-11-15  8:26               ` Mike Rapoport
2020-11-15  8:26               ` Mike Rapoport
2020-11-15  8:26               ` Mike Rapoport
2020-11-17 15:09               ` David Hildenbrand
2020-11-17 15:09                 ` David Hildenbrand
2020-11-17 15:09                 ` David Hildenbrand
2020-11-17 15:09                 ` David Hildenbrand
2020-11-17 15:58                 ` Mike Rapoport [this message]
2020-11-17 15:58                   ` Mike Rapoport
2020-11-17 15:58                   ` Mike Rapoport
2020-11-17 15:58                   ` Mike Rapoport
2020-11-10 15:14 ` [PATCH v8 3/9] set_memory: allow set_direct_map_*_noflush() for multiple pages Mike Rapoport
2020-11-10 15:14   ` Mike Rapoport
2020-11-10 15:14   ` Mike Rapoport
2020-11-10 15:14   ` Mike Rapoport
2020-11-13 12:26   ` Catalin Marinas
2020-11-13 12:26     ` Catalin Marinas
2020-11-13 12:26     ` Catalin Marinas
2020-11-13 12:26     ` Catalin Marinas
2020-11-10 15:14 ` [PATCH v8 4/9] mm: introduce memfd_secret system call to create "secret" memory areas Mike Rapoport
2020-11-10 15:14   ` Mike Rapoport
2020-11-10 15:14   ` Mike Rapoport
2020-11-10 15:14   ` Mike Rapoport
2020-11-13 13:58   ` Matthew Wilcox
2020-11-13 13:58     ` Matthew Wilcox
2020-11-13 13:58     ` Matthew Wilcox
2020-11-13 13:58     ` Matthew Wilcox
2020-11-15  8:53     ` Mike Rapoport
2020-11-15  8:53       ` Mike Rapoport
2020-11-15  8:53       ` Mike Rapoport
2020-11-15  8:53       ` Mike Rapoport
2020-11-13 14:06   ` Matthew Wilcox
2020-11-13 14:06     ` Matthew Wilcox
2020-11-13 14:06     ` Matthew Wilcox
2020-11-13 14:06     ` Matthew Wilcox
2020-11-15  8:45     ` Mike Rapoport
2020-11-15  8:45       ` Mike Rapoport
2020-11-15  8:45       ` Mike Rapoport
2020-11-15  8:45       ` Mike Rapoport
2020-11-10 15:14 ` [PATCH v8 5/9] secretmem: use PMD-size pages to amortize direct map fragmentation Mike Rapoport
2020-11-10 15:14   ` Mike Rapoport
2020-11-10 15:14   ` Mike Rapoport
2020-11-10 15:14   ` Mike Rapoport
2020-11-10 15:14 ` [PATCH v8 6/9] secretmem: add memcg accounting Mike Rapoport
2020-11-10 15:14   ` Mike Rapoport
2020-11-10 15:14   ` Mike Rapoport
2020-11-10 15:14   ` Mike Rapoport
2020-11-13  1:35   ` Andrew Morton
2020-11-13  1:35     ` Andrew Morton
2020-11-13  1:35     ` Andrew Morton
2020-11-13  1:35     ` Andrew Morton
2020-11-13 23:42   ` Roman Gushchin
2020-11-13 23:42     ` Roman Gushchin
2020-11-13 23:42     ` Roman Gushchin
2020-11-13 23:42     ` Roman Gushchin
2020-11-13 23:42     ` Roman Gushchin
2020-11-15  9:17     ` Mike Rapoport
2020-11-15  9:17       ` Mike Rapoport
2020-11-15  9:17       ` Mike Rapoport
2020-11-15  9:17       ` Mike Rapoport
2020-11-10 15:14 ` [PATCH v8 7/9] PM: hibernate: disable when there are active secretmem users Mike Rapoport
2020-11-10 15:14   ` Mike Rapoport
2020-11-10 15:14   ` Mike Rapoport
2020-11-10 15:14   ` Mike Rapoport
2020-11-10 15:14 ` [PATCH v8 8/9] arch, mm: wire up memfd_secret system call were relevant Mike Rapoport
2020-11-10 15:14   ` Mike Rapoport
2020-11-10 15:14   ` Mike Rapoport
2020-11-10 15:14   ` Mike Rapoport
2020-11-13 12:25   ` Catalin Marinas
2020-11-13 12:25     ` Catalin Marinas
2020-11-13 12:25     ` Catalin Marinas
2020-11-13 12:25     ` Catalin Marinas
2020-11-15  8:56     ` Mike Rapoport
2020-11-15  8:56       ` Mike Rapoport
2020-11-15  8:56       ` Mike Rapoport
2020-11-15  8:56       ` Mike Rapoport
2020-11-10 15:14 ` [PATCH v8 9/9] secretmem: test: add basic selftest for memfd_secret(2) Mike Rapoport
2020-11-10 15:14   ` Mike Rapoport
2020-11-10 15:14   ` Mike Rapoport
2020-11-10 15:14   ` Mike Rapoport
2020-11-12 14:56 ` [PATCH v8 0/9] mm: introduce memfd_secret system call to create "secret" memory areas Mike Rapoport
2020-11-12 14:56   ` Mike Rapoport
2020-11-12 14:56   ` Mike Rapoport
2020-11-12 14:56   ` Mike Rapoport

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