linux-kernel - Re: [PATCH 1/2]percpu: introduce read mostly percpu API

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Message-ID: <4CBF6234.9090402@zytor.com>
Date:	Wed, 20 Oct 2010 14:42:12 -0700
From:	"H. Peter Anvin" <hpa@...or.com>
To:	Eric Dumazet <eric.dumazet@...il.com>
CC:	Andi Kleen <andi@...stfloor.org>,
	Shaohua Li <shaohua.li@...el.com>,
	lkml <linux-kernel@...r.kernel.org>, Ingo Molnar <mingo@...e.hu>,
	"Chen, Tim C" <tim.c.chen@...el.com>
Subject: Re: [PATCH 1/2]percpu: introduce read mostly percpu API

On 10/20/2010 02:38 PM, H. Peter Anvin wrote:
> On 10/20/2010 12:53 AM, Eric Dumazet wrote:
>>
>> My question was more a rethoric one. I understand for sure the intent.
>>
>> All this should be explained in changelog, so that people know
>> when/where use this new class of per_cpu variables ;)
>>
> 
> Changelog really isn't the best place for this, a Documentation file
> would be better.
> 
> I'm trying to grok the intended semantic of the shared_aligned section
> right now... I'm not sure if there is a significant difference between
> the read mostly and the shared aligned section?
> 

>From the looks of it, it's a manual way to do what the linker would,
quite frankly, do better with SORT_BY_ALIGNMENT() -- although by
separating it out it might still be a win to avoid lots of "N+1"-sized
sections aligned to N.

	-hpa

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