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Tue, 3 Mar 2020 04:31:17 +0000 (UTC) Received: from t490s (ovpn-116-88.phx2.redhat.com [10.3.116.88]) by smtp.corp.redhat.com (Postfix) with ESMTPS id 301501001B2C; Tue, 3 Mar 2020 04:31:16 +0000 (UTC) Date: Mon, 2 Mar 2020 23:31:13 -0500 From: Rafael Aquini To: Andrea Arcangeli Cc: Will Deacon , Catalin Marinas , Mark Salter , Jon Masters , linux-kernel@vger.kernel.org, linux-mm@kvack.org, linux-arm-kernel@lists.infradead.org, Michal Hocko , QI Fuli Subject: Re: [PATCH 2/3] arm64: select CPUMASK_OFFSTACK if NUMA Message-ID: <20200303043113.GB94763@t490s> References: <20200223192520.20808-1-aarcange@redhat.com> <20200223192520.20808-3-aarcange@redhat.com> MIME-Version: 1.0 Content-Type: text/plain; charset=us-ascii Content-Disposition: inline In-Reply-To: <20200223192520.20808-3-aarcange@redhat.com> X-Scanned-By: MIMEDefang 2.84 on 10.5.11.22 X-Bogosity: Ham, tests=bogofilter, spamicity=0.000000, version=1.2.4 Sender: owner-linux-mm@kvack.org Precedence: bulk X-Loop: owner-majordomo@kvack.org List-ID: 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 > --- > 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