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

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Date:	Mon, 27 Jan 2014 07:49:42 -0700
From:	Toshi Kani <toshi.kani@...com>
To:	Yinghai Lu <yinghai@...nel.org>
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@...r.kernel.org
Subject: Re: [PATCH v2] x86, mm: Avoid duplicated pxm_to_node() calling.

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>


Thanks,
-Toshi

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