* Re:Re: [PATCH] kmalloc_index optimization(code size & runtime stable)
@ 2020-04-17 9:12 赵军奎
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From: 赵军奎 @ 2020-04-17 9:12 UTC (permalink / raw)
To: Matthew Wilcox; +Cc: linux-kernel, opensource.kernel
Date: 2020-04-17 11:23:54
To: Bernard Zhao <bernard@vivo.com>
Cc: Christoph Lameter <cl@linux.com>,Pekka Enberg <penberg@kernel.org>,David Rientjes <rientjes@google.com>,Joonsoo Kim <iamjoonsoo.kim@lge.com>,Andrew Morton <akpm@linux-foundation.org>,linux-mm@kvack.org,linux-kernel@vger.kernel.org,kernel@vivo.com
Subject: Re: [PATCH] kmalloc_index optimization(code size & runtime stable)>On Thu, Apr 16, 2020 at 07:03:30PM -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.
>> And follow test data shows that the performance of new optimization
>> exceeds the original algorithm when applying for more than 512 Bytes
>> (include 512B).And new optimization runtime is more stable than before.
>
>That's all very well and good, but the vast majority of allocations
>are less than 512 bytes in size! Your numbers show that on average,
>this patch makes the kernel slower!
>
This is indeed the case, the new algorithm is stable at a time level, but
there is a certain performance loss for relatively small memory(little than 512).
I will continue to pay attention to this part later. Thanks.
>> size time/Per 100 million times.us
>> old fun new fun with optimise
>> 8 203777 241934
>> 16 245611 409278
>> 32 236384 408419
>> 64 275499 447732
>> 128 354909 416439
>> 256 360472 406598
>> 512 431072 409168
>> 1024 463822 407401
>
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2020-04-17 9:12 Re:Re: [PATCH] kmalloc_index optimization(code size & runtime stable) 赵军奎
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