From: "David Hildenbrand (Arm)" <david@kernel.org>
To: Yang Shi <yang@os.amperecomputing.com>,
cl@gentwo.org, dennis@kernel.org, tj@kernel.org,
urezki@gmail.com, catalin.marinas@arm.com, will@kernel.org,
ryan.roberts@arm.com, akpm@linux-foundation.org,
hca@linux.ibm.com, gor@linux.ibm.com, agordeev@linux.ibm.com
Cc: linux-mm@kvack.org, linux-arm-kernel@lists.infradead.org,
linux-kernel@vger.kernel.org
Subject: Re: [RFC v1 PATCH 0/11] Optimize this_cpu_*() ops for non-x86 (ARM64 for this series)
Date: Tue, 12 May 2026 11:02:22 +0200 [thread overview]
Message-ID: <d16893b5-3a21-4595-b4ce-e34a7e8a199c@kernel.org> (raw)
In-Reply-To: <20260429170758.3018959-1-yang@os.amperecomputing.com>
> =========
> The benchmarks are done on 160 core AmpereOne machine. The baseline is
> v7.1-rc1 kernel.
>
> 1. Kernel Build
> ---------------
> Run kernel build (make -j160) with the default Fedora kernel config in a
> memcg.
> 13% - 18% sys time improvment
> 3% - 7% wall time improvement
This is pretty impressive!
There was quite some feedback during the LSF/MM session, what's the current plan?
Also, it was raised that Linus so far didn't enjoy per-process page tables. Is
there a way forward?
Finally, in the LSF/MM session, there was the question why the preemption
handling is even required. Can you describe what the problem is?
--
Cheers,
David
next prev parent reply other threads:[~2026-05-12 9:03 UTC|newest]
Thread overview: 17+ messages / expand[flat|nested] mbox.gz Atom feed top
2026-04-29 17:04 [RFC v1 PATCH 0/11] Optimize this_cpu_*() ops for non-x86 (ARM64 for this series) Yang Shi
2026-04-29 17:04 ` [PATCH 01/11] arm64: mm: enable percpu kernel page table Yang Shi
2026-04-29 17:04 ` [PATCH 02/11] arm64: mm: define percpu virtual space area Yang Shi
2026-04-29 17:04 ` [PATCH 03/11] arm64: smp: define setup_per_cpu_areas() Yang Shi
2026-04-29 17:04 ` [PATCH 04/11] mm: percpu: prepare to use dedicated percpu area Yang Shi
2026-04-29 17:04 ` [PATCH 05/11] arm64: mm: map local percpu first chunk Yang Shi
2026-04-29 17:04 ` [PATCH 06/11] mm: percpu: set up first chunk and reserve chunk Yang Shi
2026-04-29 17:04 ` [PATCH 07/11] arm64: mm: introduce __per_cpu_local_off Yang Shi
2026-04-29 17:04 ` [PATCH 08/11] vmalloc: pass in pgd pointer for vmap{__vunmap}_range_noflush() Yang Shi
2026-04-29 17:04 ` [PATCH 09/11] mm: percpu: allocate and free local percpu vm area Yang Shi
2026-04-29 17:04 ` [PATCH 10/11] arm64: kconfig: select HAVE_LOCAL_PER_CPU_MAP Yang Shi
2026-04-29 17:04 ` [PATCH 11/11] arm64: percpu: use local percpu for this_cpu_*() APIs Yang Shi
2026-04-30 19:02 ` [RFC v1 PATCH 0/11] Optimize this_cpu_*() ops for non-x86 (ARM64 for this series) Yang Shi
2026-05-12 9:02 ` David Hildenbrand (Arm) [this message]
2026-05-14 0:00 ` Yang Shi
2026-05-15 16:28 ` Heiko Carstens
2026-05-15 18:35 ` Yang Shi
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