linux-kernel - Re: [PATCH v2 1/2] kmem_cache: include allocators code directly into slab

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Date:	Thu, 25 Oct 2012 02:29:17 +0900
From:	JoonSoo Kim <js1304@...il.com>
To:	Glauber Costa <glommer@...allels.com>
Cc:	Christoph Lameter <cl@...ux.com>, andi@...stfloor.org,
	linux-mm@...ck.org, linux-kernel@...r.kernel.org,
	David Rientjes <rientjes@...gle.com>,
	Pekka Enberg <penberg@...nel.org>
Subject: Re: [PATCH v2 1/2] kmem_cache: include allocators code directly into slab_common

2012/10/24 Glauber Costa <glommer@...allels.com>:
> On 10/24/2012 06:29 PM, Christoph Lameter wrote:
>> On Wed, 24 Oct 2012, Glauber Costa wrote:
>>
>>> Because of that, we either have to move all the entry points to the
>>> mm/slab.h and rely heavily on the pre-processor, or include all .c files
>>> in here.
>>
>> Hmm... That is a bit of a radical solution. The global optimizations now
>> possible with the new gcc compiler include the ability to fold functions
>> across different linkable objects. Andi, is that usable for kernel builds?
>>
>
> In general, it takes quite a lot of time to take all those optimizations
> for granted. We still live a lot of time with multiple compiler versions
> building distros, etc, for quite some time.
>
> I would expect the end result for anyone not using such a compiler to be
> a sudden performance drop when using a new kernel. Not really pleasant.

I agree with Glauber's opinion.
And patch looks fine to me.
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