linux-kernel - Re: [PATCH 7/7] erofs: lzma compression support

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Message-ID: <e920e58d-d003-32cb-2910-64eea15beb58@kernel.org>
Date:   Tue, 19 Oct 2021 21:04:09 +0800
From:   Chao Yu <chao@...nel.org>
To:     Gao Xiang <xiang@...nel.org>, linux-erofs@...ts.ozlabs.org,
        LKML <linux-kernel@...r.kernel.org>
Cc:     Lasse Collin <lasse.collin@...aani.org>,
        Andrew Morton <akpm@...ux-foundation.org>,
        Greg KH <gregkh@...uxfoundation.org>,
        Linus Torvalds <torvalds@...ux-foundation.org>,
        Gao Xiang <hsiangkao@...ux.alibaba.com>
Subject: Re: [PATCH 7/7] erofs: lzma compression support

On 2021/10/11 5:31, Gao Xiang wrote:
> From: Gao Xiang <hsiangkao@...ux.alibaba.com>
> 
> Add MicroLZMA support in order to maximize compression ratios for
> specific scenarios. For example, it's useful for low-end embedded
> boards and as a secondary algorithm in a file for specific access
> patterns.
> 
> MicroLZMA is a new container format for raw LZMA1, which was created
> by Lasse Collin aiming to minimize old LZMA headers and get rid of
> unnecessary EOPM (end of payload marker) as well as to enable
> fixed-sized output compression, especially for 4KiB pclusters.
> 
> Similar to LZ4, inplace I/O approach is used to minimize runtime
> memory footprint when dealing with I/O. Overlapped decompression is
> handled with 1) bounced buffer for data under processing or 2) extra
> short-lived pages from the on-stack pagepool which will be shared in
> the same read request (128KiB for example).
> 
> Signed-off-by: Gao Xiang <hsiangkao@...ux.alibaba.com>

Acked-by: Chao Yu <chao@...nel.org>

Thanks,