linux-kernel - Re: [f2fs-dev] [PATCH v3 4/4] f2fs: Add option to limit required GC for checkpoint=disable

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Message-ID: <cbd6e561-66c3-da63-d5b4-e81da990bd15@kernel.org>
Date:   Mon, 3 Jun 2019 23:15:37 +0800
From:   Chao Yu <chao@...nel.org>
To:     Daniel Rosenberg <drosen@...gle.com>,
        Jaegeuk Kim <jaegeuk@...nel.org>, Chao Yu <yuchao0@...wei.com>,
        Jonathan Corbet <corbet@....net>,
        linux-f2fs-devel@...ts.sourceforge.net
Cc:     linux-fsdevel@...r.kernel.org, kernel-team@...roid.com,
        linux-kernel@...r.kernel.org, linux-doc@...r.kernel.org
Subject: Re: [f2fs-dev] [PATCH v3 4/4] f2fs: Add option to limit required GC
 for checkpoint=disable

On 2019-5-30 8:49, Daniel Rosenberg via Linux-f2fs-devel wrote:
> This extends the checkpoint option to allow checkpoint=disable:%u[%]
> This allows you to specify what how much of the disk you are willing
> to lose access to while mounting with checkpoint=disable. If the amount
> lost would be higher, the mount will return -EAGAIN. This can be given
> as a percent of total space, or in blocks.
> 
> Currently, we need to run garbage collection until the amount of holes
> is smaller than the OVP space. With the new option, f2fs can mark
> space as unusable up front instead of requiring garbage collection until
> the number of holes is small enough.
> 
> Signed-off-by: Daniel Rosenberg <drosen@...gle.com>

Reviewed-by: Chao Yu <yuchao0@...wei.com>

Thanks,