linux-kernel - Re: [PATCH 4/4] compcache: documentation

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Date:	Sat, 29 Aug 2009 07:30:20 +0530
From:	Nitin Gupta <ngupta@...are.org>
To:	balbir@...ux.vnet.ibm.com
CC:	akpm@...ux-foundation.org, linux-kernel@...r.kernel.org,
	linux-mm@...ck.org, linux-mm-cc@...top.org
Subject: Re: [PATCH 4/4] compcache: documentation

On 08/29/2009 01:23 AM, Balbir Singh wrote:
> * Nitin Gupta<ngupta@...are.org>  [2009-08-25 23:41:06]:
>
>> On 08/25/2009 10:33 PM, Balbir Singh wrote:
>>
>>
>>>> +It consists of three modules:
>>>> + - xvmalloc.ko: memory allocator
>>>
>>> I've seen your case for a custom allocator, but why can't we
>>>
>>> 1) Refactor slob and use it
>>
>> SLOB is fundamentally a different allocator. It looked at it in detail
>> but could not image how can I make it suitable for the project. SLOB
>> really does not fit it.
>>
>>> 2) Do we care about the optimizations in SLUB w.r.t. scalability in
>>> your module? If so.. will xvmalloc meet those requirements?
>>>
>>
>> Scalability is desired which xvmalloc lacks in its current state. My
>> plan is to have a wrapper around xvmalloc that creates per-cpu pools
>> and leave xvmalloc core simple. Along with this, detailed profiling
>> needs to be done to see where the bottlenecks are in the core itself.
>>
>
> I've not yet tested the patches, but adding another allocator does
> worry me a bit. Do you intend to allow other users to consume the
> allocator routines?
>

No. This allocator is not compiled as separate module, does not export any
symbol and is compiled with ramzswap. So, no one else can use it.

Thanks,
Nitin
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