linux-kernel - Re: [PATCH] genalloc: make possible to use a custom allocation algorithm

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Message-ID: <CACRpkdb=ie-94D3izWkhKW_EY3KLL-X5buAvMvXrSZmWZMCcLA@mail.gmail.com>
Date:	Fri, 7 Sep 2012 23:22:16 +0200
From:	Linus Walleij <linus.walleij@...aro.org>
To:	Benjamin Gaignard <benjamin.gaignard@...aro.org>
Cc:	linux-kernel@...r.kernel.org, akpm@...ux-foundation.org,
	ying.huang@...el.com,
	Benjamin Gaignard <benjamin.gaignard@...ricsson.com>
Subject: Re: [PATCH] genalloc: make possible to use a custom allocation algorithm

On Fri, Sep 7, 2012 at 11:16 AM, Benjamin Gaignard
<benjamin.gaignard@...aro.org> wrote:

> From: Benjamin Gaignard <benjamin.gaignard@...ricsson.com>
>
> This patch allow to use another algorithm than the default first-fit one.
> For example a custom algorithm could be used to manage alignment requirements.
>
> Add of best-fit algorithm function:
> most of the time best-fit is slower then first-fit but memory fragmentation is lower.
> Random buffer allocation/free tests don't show any arithmetic relation between
> allocation time and fragmentation but best-fit algorithm is sometime able to perform the allocation when first-fit can't.
>
> This new algorithm help to solve fragmentation issues on ESRAM shared by multiple
> hardware IP allocating and freeing dynamically memory region of various sizes.
>
> Signed-off-by: Benjamin Gaignard <benjamin.gaignard@...ricsson.com>

We really need this to manage our on-chip RAM
(ESRAM) which is a scarce resource, so:
Acked-by: Linus Walleij <linus.walleij@...aro.org>

Yours,
Linus Walleij
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