From: Charlie Jenkins <charlie@rivosinc•com>
To: Dave Hansen <dave.hansen@intel•com>
Cc: Arnd Bergmann <arnd@arndb•de>,
Paul Walmsley <paul.walmsley@sifive•com>,
Palmer Dabbelt <palmer@dabbelt•com>,
Albert Ou <aou@eecs•berkeley.edu>,
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Nicholas Piggin <npiggin@gmail•com>,
Christophe Leroy <christophe.leroy@csgroup•eu>,
Naveen N Rao <naveen@kernel•org>,
Muchun Song <muchun.song@linux•dev>,
Andrew Morton <akpm@linux-foundation•org>,
"Liam R. Howlett" <Liam.Howlett@oracle•com>,
Vlastimil Babka <vbabka@suse•cz>,
Lorenzo Stoakes <lorenzo.stoakes@oracle•com>,
Thomas Gleixner <tglx@linutronix•de>,
Ingo Molnar <mingo@redhat•com>, Borislav Petkov <bp@alien8•de>,
Dave Hansen <dave.hansen@linux•intel.com>,
x86@kernel•org, "H. Peter Anvin" <hpa@zytor•com>,
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WANG Xuerui <kernel@xen0n•name>,
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Yoshinori Sato <ysato@users•sourceforge.jp>,
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John Paul Adrian Glaubitz <glaubitz@physik•fu-berlin.de>,
"David S. Miller" <davem@davemloft•net>,
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linux-kselftest@vger•kernel.org
Subject: Re: [PATCH 00/16] mm: Introduce MAP_BELOW_HINT
Date: Thu, 29 Aug 2024 18:00:25 -0700 [thread overview]
Message-ID: <ZtEZqUSkVvi5Bmpt@ghost> (raw)
In-Reply-To: <4219f619-4b32-40bc-85b8-cb11d76fde98@intel.com>
On Thu, Aug 29, 2024 at 09:54:08AM -0700, Dave Hansen wrote:
> On 8/28/24 13:15, Charlie Jenkins wrote:
> > A way to restrict mmap() to return LAM compliant addresses in an entire
> > address space also doesn't have to be mutually exclusive with this flag.
> > This flag allows for the greatest degree of control from applications.
> > I don't believe there is additionally performance saving that could be
> > achieved by having this be on a per address space basis.
>
> I agree with you in general. The MAP_BELOW_HINT _is_ the most flexible.
> But it's also rather complicated.
Can you expand upon what you mean by it being complicated? Complicated
for the kernel or complicated for a user?
>
> My _hope_ would be that a per-address-space property could share at
> least some infrastructure with what x86/LAM and arm/TBI do to the
> address space. Basically put the restrictions in place for purely
> software reasons instead of the mostly hardware reasons for LAM/TBI.
That is a good point, perhaps that would be a way to hook this into LAM,
TBI, and any other architecture's specific address masking feature.
- Charlie
>
> Lorenzo also raised some very valid points about a having a generic
> address-restriction ABI. I'm certainly not discounting those concerns.
> It's not something that can be done lightly.
next prev parent reply other threads:[~2024-08-30 1:00 UTC|newest]
Thread overview: 33+ messages / expand[flat|nested] mbox.gz Atom feed top
2024-08-28 5:49 [PATCH 00/16] mm: Introduce MAP_BELOW_HINT Charlie Jenkins
2024-08-28 5:49 ` [PATCH 01/16] mm: Add MAP_BELOW_HINT Charlie Jenkins
2024-08-28 5:49 ` [PATCH 02/16] riscv: mm: Do not restrict mmap address based on hint Charlie Jenkins
2024-08-28 5:49 ` [PATCH 03/16] mm: Add flag and len param to arch_get_mmap_base() Charlie Jenkins
2024-08-28 5:49 ` [PATCH 04/16] mm: Add generic MAP_BELOW_HINT Charlie Jenkins
2024-08-28 5:49 ` [PATCH 05/16] riscv: mm: Support MAP_BELOW_HINT Charlie Jenkins
2024-08-28 5:49 ` [PATCH 06/16] arm64: " Charlie Jenkins
2024-08-28 5:49 ` [PATCH 07/16] powerpc: " Charlie Jenkins
2024-08-28 6:34 ` Christophe Leroy
2024-08-28 17:29 ` Charlie Jenkins
2024-08-31 16:30 ` David Laight
2024-08-28 5:49 ` [PATCH 08/16] x86: " Charlie Jenkins
2024-08-28 5:49 ` [PATCH 09/16] loongarch: " Charlie Jenkins
2024-08-28 5:49 ` [PATCH 10/16] arm: " Charlie Jenkins
2024-08-28 5:49 ` [PATCH 11/16] mips: " Charlie Jenkins
2024-08-28 5:49 ` [PATCH 12/16] parisc: " Charlie Jenkins
2024-08-28 5:49 ` [PATCH 13/16] s390: " Charlie Jenkins
2024-08-28 5:49 ` [PATCH 14/16] sh: " Charlie Jenkins
2024-08-28 5:49 ` [PATCH 15/16] sparc: " Charlie Jenkins
2024-08-28 5:49 ` [PATCH 16/16] selftests/mm: Create MAP_BELOW_HINT test Charlie Jenkins
2024-08-28 17:48 ` Lorenzo Stoakes
2024-08-28 18:13 ` Charlie Jenkins
2024-08-28 18:19 ` [PATCH 00/16] mm: Introduce MAP_BELOW_HINT Lorenzo Stoakes
2024-08-29 7:14 ` Charlie Jenkins
2024-08-28 18:29 ` Dave Hansen
2024-08-28 20:15 ` Charlie Jenkins
2024-08-29 16:54 ` Dave Hansen
2024-08-29 19:36 ` Liam R. Howlett
2024-08-30 1:10 ` Charlie Jenkins
2024-08-30 1:00 ` Charlie Jenkins [this message]
2024-08-28 18:31 ` Liam R. Howlett
2024-08-28 20:59 ` Charlie Jenkins
2024-08-28 21:39 ` Charlie Jenkins
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