linux-kernel - Re: [PATCH] erofs: avoid unnecessary loops in z_erofs_pcluster

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Message-ID: <56c3e00b-d383-105d-29a3-570d94df4801@kernel.org>
Date:   Tue, 11 Jul 2023 21:56:25 +0800
From:   Chao Yu <chao@...nel.org>
To:     Chunhai Guo <guochunhai@...o.com>, xiang@...nel.org
Cc:     huyue2@...lpad.com, jefflexu@...ux.alibaba.com,
        linux-erofs@...ts.ozlabs.org, linux-kernel@...r.kernel.org
Subject: Re: [PATCH] erofs: avoid unnecessary loops in
 z_erofs_pcluster_readmore() when read page beyond EOF

On 2023/7/10 12:25, Chunhai Guo wrote:
> z_erofs_pcluster_readmore() may take a long time to loop when the page
> offset is large enough, which is unnecessary should be prevented.
> For example, when the following case is encountered, it will loop 4691368
> times, taking about 27 seconds.
>      - offset = 19217289215
>      - inode_size = 1442672
> 
> Signed-off-by: Chunhai Guo <guochunhai@...o.com>

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

Thanks,