From: Dave Hansen <dave.hansen@intel.com>
To: Charlie Jenkins <charlie@rivosinc.com>
Cc: Arnd Bergmann <arnd@arndb.de>,
Paul Walmsley <paul.walmsley@sifive.com>,
Palmer Dabbelt <palmer@dabbelt.com>,
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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>,
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linux-kselftest@vger.kernel.org
Subject: Re: [PATCH 00/16] mm: Introduce MAP_BELOW_HINT
Date: Thu, 29 Aug 2024 09:54:08 -0700 [thread overview]
Message-ID: <4219f619-4b32-40bc-85b8-cb11d76fde98@intel.com> (raw)
In-Reply-To: <Zs+FYbII0ewwdisg@ghost>
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.
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.
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:[~2024-08-29 16:54 UTC|newest]
Thread overview: 33+ messages / expand[flat|nested] mbox.gz Atom feed top
2024-08-28 5:49 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 [this message]
2024-08-29 19:36 ` Liam R. Howlett
2024-08-30 1:10 ` Charlie Jenkins
2024-08-30 1:00 ` Charlie Jenkins
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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