linux-kernel - Re: [PATCH v7 10/14] arm64/numa: define numa

lists.openwall.net		lists / announce owl-users owl-dev john-users john-dev passwdqc-users yescrypt popa3d-users / oss-security kernel-hardening musl sabotage tlsify passwords / crypt-dev xvendor / Bugtraq Full-Disclosure linux-kernel linux-netdev linux-ext4 linux-hardening linux-cve-announce PHC
Open Source and information security mailing list archives

Hash Suite: Windows password security audit tool. GUI, reports in PDF.

[<prev] [next>] [<thread-prev] [thread-next>] [day] [month] [year] [list]

Date:   Fri, 26 Aug 2016 16:29:16 +0100
From:   Will Deacon <will.deacon@....com>
To:     Zhen Lei <thunder.leizhen@...wei.com>
Cc:     Catalin Marinas <catalin.marinas@....com>,
        linux-arm-kernel <linux-arm-kernel@...ts.infradead.org>,
        linux-kernel <linux-kernel@...r.kernel.org>,
        Rob Herring <robh+dt@...nel.org>,
        Frank Rowand <frowand.list@...il.com>,
        devicetree <devicetree@...r.kernel.org>,
        Zefan Li <lizefan@...wei.com>, Xinwei Hu <huxinwei@...wei.com>,
        Tianhong Ding <dingtianhong@...wei.com>,
        Hanjun Guo <guohanjun@...wei.com>
Subject: Re: [PATCH v7 10/14] arm64/numa: define numa_distance as array to
 simplify code

On Wed, Aug 24, 2016 at 03:44:49PM +0800, Zhen Lei wrote:
> 1. MAX_NUMNODES is base on CONFIG_NODES_SHIFT, the default value of the
>    latter is very small now.
> 2. Suppose the default value of MAX_NUMNODES is enlarged to 64, so the
>    size of numa_distance is 4K, it's still acceptable if run the Image
>    on other processors.
> 3. It will make function __node_distance quicker than before.
> 
> Signed-off-by: Zhen Lei <thunder.leizhen@...wei.com>
> ---
>  arch/arm64/include/asm/numa.h |  1 -
>  arch/arm64/mm/numa.c          | 74 +++----------------------------------------
>  2 files changed, 5 insertions(+), 70 deletions(-)

I fail to see the advantages of this patch. Do you have some compelling
performance figures or something?

Will