linux-kernel - Re: [PATCH 3/6] compcache: TLSF Allocator interface

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Message-ID: <4cefeab80804031023m10924d6n9e21f6cb792f5d76@mail.gmail.com>
Date:	Thu, 3 Apr 2008 22:53:43 +0530
From:	"Nitin Gupta" <nitingupta910@...il.com>
To:	"Peter Zijlstra" <a.p.zijlstra@...llo.nl>
Cc:	linux-kernel@...r.kernel.org, linux-mm@...ck.org
Subject: Re: [PATCH 3/6] compcache: TLSF Allocator interface

On Tue, Mar 25, 2008 at 12:26 AM, Peter Zijlstra <a.p.zijlstra@...llo.nl> wrote:

>  Yeah, it also suffers from a horrible coding style, can use excessive
>  amounts of vmalloc space, isn't hooked into the reclaim process as an
>  allocator should be and has a severe lack of per-cpu data making it a
>  pretty big bottleneck on anything with more than a few cores.
>
>  Now, it might be needed, might work better, and the scalability issue
>  might not be a problem when used for swap, but still, you don't treat
>  any of these points in your changelog.
>


I will add these points to changelog.
This project is meant for small systems only. So, scalability is not an issue.


>  FWIW, please split up the patches in a sane way. This series looks like
>  it wants to be 2 or 3 patches. The first introducing all of TLSF (this
>  split per file is horrible). The second doing all of the block device,
>  and a possible last doing documentation and such.
>

Ok. I will resend with better splitting.


>  Also, how bad was kmalloc() compared to this TLSF, we need numbers :-)
>
>

I have posted performance numbers at:
http://code.google.com/p/compcache/wiki/AllocatorsComparison

Data Summary:

Peak Memory Usage:

    * Ideal: 24947 KB
    * TLSF: 25377 KB
    * KMalloc(SLUB): 36483 KB

So, KMalloc uses ~43% more memory than TLSF!


- Nitin
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