linux-kernel - Re: [PATCH v2] x86, mm: Avoid duplicated pxm_to

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Message-ID: <CAE9FiQUZ8WD3nNAr=Y946y7=hqMfkqa72N-5fpOrGfaE4KTYfA@mail.gmail.com>
Date:	Mon, 27 Jan 2014 11:08:18 -0800
From:	Yinghai Lu <yinghai@...nel.org>
To:	Toshi Kani <toshi.kani@...com>
Cc:	Ingo Molnar <mingo@...nel.org>, "H. Peter Anvin" <hpa@...or.com>,
	Thomas Gleixner <tglx@...utronix.de>,
	Andrew Morton <akpm@...ux-foundation.org>,
	David Rientjes <rientjes@...gle.com>,
	Linux Kernel Mailing List <linux-kernel@...r.kernel.org>
Subject: Re: [PATCH v2] x86, mm: Avoid duplicated pxm_to_node() calling.

On Mon, Jan 27, 2014 at 6:49 AM, Toshi Kani <toshi.kani@...com> wrote:
> On Sun, 2014-01-26 at 13:01 -0800, Yinghai Lu wrote:
>> In slit init code, more pxm_to_node() calling are added.
>>
>> We can store from_node/to_node instead of keep calling pxm_to_node().
>>
>> After this patch: pxm_to_node() is called n*(1+n)
>> Before this patch: pxm_to_node() is called n*(1+n*3)
>>
>> for 8 socket, it will be 72 instead of 200.
>> for 32 socket, it will be 1056 instead of 3104.
>>
>> -v2: update title and change log according to Ingo.
>>      move from_node/to_node in loop and change to const according to
>>       David Rientjes.
>>
>> Signed-off-by: Yinghai Lu <yinghai@...nel.org>
>
> In my original patch, I added the following comment to the function to
> address David's comment (which he acked).  So, can you add this comment?
>
> -/* Callback for SLIT parsing */
> +/*
> + * Callback for SLIT parsing.  pxm_to_node() returns NUMA_NO_NODE for
> + * I/O localities since SRAT does not list them.  I/O localities are
> + * not supported at this point.
> + */
>
> Otherwise, the change looks good to me.
>
> Acked-by: Toshi Kani <toshi.kani@...com>

Hi, Toshi,

This patch is delta patch to your patch that is in tip already.

So you comments change is still there and not touched.

Thanks

Yinghai
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