linux-kernel - Re: [PATCH] irqchip: gicv3-its: Use NUMA aware memory allocation for ITS tables

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Message-ID: <ab7e26a8-5ab7-7c47-f19c-cb02fbd397b6@arm.com>
Date:   Fri, 30 Jun 2017 09:51:40 +0100
From:   Marc Zyngier <marc.zyngier@....com>
To:     Ganapatrao Kulkarni <gpkulkarni@...il.com>,
        Shanker Donthineni <shankerd@...eaurora.org>
Cc:     linux-kernel <linux-kernel@...r.kernel.org>,
        linux-arm-kernel <linux-arm-kernel@...ts.infradead.org>,
        Thomas Gleixner <tglx@...utronix.de>,
        Jason Cooper <jason@...edaemon.net>,
        Vikram Sethi <vikrams@...eaurora.org>,
        Jayachandran C <jnair@...iumnetworks.com>,
        "ganapatrao.kulkarni@...ium.com" <ganapatrao.kulkarni@...ium.com>
Subject: Re: [PATCH] irqchip: gicv3-its: Use NUMA aware memory allocation for
 ITS tables

On 30/06/17 04:01, Ganapatrao Kulkarni wrote:
> On Fri, Jun 30, 2017 at 8:04 AM, Ganapatrao Kulkarni
> <gpkulkarni@...il.com> wrote:
>> Hi Shanker,
>>
>> On Sun, Jun 25, 2017 at 9:16 PM, Shanker Donthineni
>> <shankerd@...eaurora.org> wrote:
>>> The NUMA node information is visible to ITS driver but not being used
>>> other than handling errata. This patch allocates the memory for ITS
>>> tables from the corresponding NUMA node using the appropriate NUMA
>>> aware functions.
> 
> IMHO, the description would have been more constructive?
> 
> "All ITS tables are mapped by default to NODE 0 memory.
> Adding changes to allocate memory from respective NUMA NODES of ITS devices.
> This will optimize tables access and avoids unnecessary inter-node traffic."

But more importantly, I'd like to see figures showing the actual benefit
of this per-node allocation. Given that both of you guys have access to
such platforms, please show me the numbers!

Thanks,

	M.
-- 
Jazz is not dead. It just smells funny...