linux-kernel - Re:Re: [PATCH V2] kmalloc_index optimization(code size & runtime stable)

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Date:   Tue, 21 Apr 2020 19:55:03 +0800 (GMT+08:00)
From:   赵军奎 <bernard@...o.com>
To:     Matthew Wilcox <willy@...radead.org>
Cc:     Christoph Lameter <cl@...ux.com>,
        Pekka Enberg <penberg@...nel.org>,
        David Rientjes <rientjes@...gle.com>,
        Joonsoo Kim <iamjoonsoo.kim@....com>,
        Andrew Morton <akpm@...ux-foundation.org>, linux-mm@...ck.org,
        linux-kernel@...r.kernel.org, opensource.kernel@...o.com
Subject: Re:Re: [PATCH V2] kmalloc_index optimization(code size & runtime stable)



From: Matthew Wilcox <willy@...radead.org>
Date: 2020-04-21 19:18:49
To:  1587089010-110083-1-git-send-email-bernard@...o.com
Cc:  Christoph Lameter <cl@...ux.com>,Pekka Enberg <penberg@...nel.org>,David Rientjes <rientjes@...gle.com>,Joonsoo Kim <iamjoonsoo.kim@....com>,Andrew Morton <akpm@...ux-foundation.org>,linux-mm@...ck.org,linux-kernel@...r.kernel.org,opensource.kernel@...o.com,Bernard Zhao <bernard@...o.com>
Subject: Re: [PATCH V2] kmalloc_index optimization(code size & runtime stable)>On Mon, Apr 20, 2020 at 08:25:01PM -0700, Bernard Zhao wrote:
>> kmalloc_index inline function code size optimization and runtime
>> performance stability optimization. After optimization, the function
>> kmalloc_index is more stable, the size will never affecte the function`s
>> execution efficiency.
>
>Please stop posting this patch until it's faster *for small sizes*.
>As I explained last time you posted it, it's not an optimisation.
>
>>             size        time/Per 100 million times
>>                         old fun		new fun with optimise
>> 		8	203777		241934
>> 		16	245611		409278
>> 		32	236384		408419
>> 		64	275499		447732
>> 		128	354909		416439
>
>^^^^ these are the important cases that need to be fast.
>

Sure, i just received some kbuild compiler error mails and prompt me to do something? 
I don`t know why this happened, so i update the patch again.

Regards,
Bernard