Re: [PATCH v9 0/5] Add NUMA-awareness to qspinlock
From: "Paul E. McKenney" <paulmck@kernel.org>
Date: 2020-01-25 04:58:47
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On Fri, Jan 24, 2020 at 09:17:05PM -0500, Waiman Long wrote:
On 1/24/20 8:59 PM, Waiman Long wrote:quoted
quoted
You called it! I will play with QEMU's -numa argument to see if I can get CNA to run for me. Please accept my apologies for the false alarm. Thanx, PaulCNA is not currently supported in a VM guest simply because the numa information is not reliable. You will have to run it on baremetal to test it. Sorry for that.Correction. There is a command line option to force CNA lock to be used in a VM. Use the "numa_spinlock=on" boot command line parameter.
As I understand it, I need to use a series of -numa arguments to qemu combined with the numa_spinlock=on (or =1) on the kernel command line. If the kernel thinks that there is only one NUMA node, it appears to avoid doing CNA. Correct? Thanx, Paul _______________________________________________ linux-arm-kernel mailing list linux-arm-kernel@lists.infradead.org http://lists.infradead.org/mailman/listinfo/linux-arm-kernel