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Date:   Tue, 19 Oct 2021 21:04:09 +0800
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Subject: Re: [PATCH 7/7] erofs: lzma compression support
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To:     Gao Xiang <xiang@kernel.org>, linux-erofs@lists.ozlabs.org,
        LKML <linux-kernel@vger.kernel.org>
Cc:     Lasse Collin <lasse.collin@tukaani.org>,
        Andrew Morton <akpm@linux-foundation.org>,
        Greg KH <gregkh@linuxfoundation.org>,
        Linus Torvalds <torvalds@linux-foundation.org>,
        Gao Xiang <hsiangkao@linux.alibaba.com>
References: <20211010213145.17462-1-xiang@kernel.org>
 <20211010213145.17462-8-xiang@kernel.org>
From:   Chao Yu <chao@kernel.org>
In-Reply-To: <20211010213145.17462-8-xiang@kernel.org>
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On 2021/10/11 5:31, Gao Xiang wrote:
> From: Gao Xiang <hsiangkao@linux.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@linux.alibaba.com>

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

Thanks,