From: Rafael Aquini <aquini@redhat.com>
To: Andrea Arcangeli <aarcange@redhat.com>
Cc: Will Deacon <will@kernel.org>,
Catalin Marinas <catalin.marinas@arm.com>,
Mark Salter <msalter@redhat.com>,
Jon Masters <jcm@jonmasters.org>,
linux-kernel@vger.kernel.org, linux-mm@kvack.org,
linux-arm-kernel@lists.infradead.org,
Michal Hocko <mhocko@kernel.org>, QI Fuli <qi.fuli@fujitsu.com>
Subject: Re: [PATCH 2/3] arm64: select CPUMASK_OFFSTACK if NUMA
Date: Mon, 2 Mar 2020 23:31:13 -0500 [thread overview]
Message-ID: <20200303043113.GB94763@t490s> (raw)
In-Reply-To: <20200223192520.20808-3-aarcange@redhat.com>
On Sun, Feb 23, 2020 at 02:25:19PM -0500, Andrea Arcangeli wrote:
> It's unclear why normally CPUMASK_OFFSTACK can only be manually
> configured "if DEBUG_PER_CPU_MAPS" which is not an option meant to be
> enabled on enterprise arm64 kernels.
>
> The default enterprise kernels NR_CPUS is 4096 which is fairly large.
> So it'll save some RAM and it'll increase reliability to select
> CPUMASK_OFFSET at least when NUMA is selected and a large NR_CPUS is
> to be expected.
>
> Signed-off-by: Andrea Arcangeli <aarcange@redhat.com>
> ---
> arch/arm64/Kconfig | 1 +
> 1 file changed, 1 insertion(+)
>
> diff --git a/arch/arm64/Kconfig b/arch/arm64/Kconfig
> index 0b30e884e088..882887e65394 100644
> --- a/arch/arm64/Kconfig
> +++ b/arch/arm64/Kconfig
> @@ -955,6 +955,7 @@ config NUMA
> bool "Numa Memory Allocation and Scheduler Support"
> select ACPI_NUMA if ACPI
> select OF_NUMA
> + select CPUMASK_OFFSTACK
> help
> Enable NUMA (Non Uniform Memory Access) support.
>
Acked-by: Rafael Aquini <aquini@redhat.com>
next prev parent reply other threads:[~2020-03-03 4:31 UTC|newest]
Thread overview: 15+ messages / expand[flat|nested] mbox.gz Atom feed top
2020-02-23 19:25 [PATCH 0/3] arm64: tlb: skip tlbi broadcast v2 Andrea Arcangeli
2020-02-23 19:25 ` [PATCH 1/3] mm: use_mm: fix for arches checking mm_users to optimize TLB flushes Andrea Arcangeli
2020-03-03 4:28 ` Rafael Aquini
2020-02-23 19:25 ` [PATCH 2/3] arm64: select CPUMASK_OFFSTACK if NUMA Andrea Arcangeli
2020-03-03 4:31 ` Rafael Aquini [this message]
2020-02-23 19:25 ` [PATCH 3/3] arm64: tlb: skip tlbi broadcast Andrea Arcangeli
2020-03-02 15:24 ` Rafael Aquini
2020-03-04 4:19 ` Rafael Aquini
2020-03-09 11:22 ` Catalin Marinas
2020-03-14 3:16 ` Andrea Arcangeli
2020-03-16 14:09 ` Mark Rutland
2020-03-31 9:45 ` Mark Rutland
2020-04-01 0:32 ` Andrea Arcangeli
2020-03-03 13:01 ` [PATCH 0/3] arm64: tlb: skip tlbi broadcast v2 Larry Woodman
2020-03-18 8:53 ` qi.fuli
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