From: Sergey Senozhatsky <senozhatsky@chromium.org>
To: Gao Xiang <hsiangkao@linux.alibaba.com>
Cc: Sergey Senozhatsky <senozhatsky@chromium.org>,
Yuwen Chen <ywen.chen@foxmail.com>,
akpm@linux-foundation.org, bgeffon@google.com,
licayy@outlook.com, linux-block@vger.kernel.org,
linux-kernel@vger.kernel.org, linux-mm@kvack.org,
minchan@kernel.org, richardycc@google.com
Subject: Re: [RFC PATCHv5 0/6] zram: introduce writeback bio batching
Date: Sun, 23 Nov 2025 09:08:25 +0900 [thread overview]
Message-ID: <nx6o4gwpetxjeyfbu4xyibulvldr3xz6lyfjrar62cidy5gxum@xmx4ojyq3mbf> (raw)
In-Reply-To: <2c6906d1-132e-401f-830f-ae771fe836c5@linux.alibaba.com>
On (25/11/22 22:09), Gao Xiang wrote:
> > I thought you were talking about the backing device being
> > ext4/btrfs. Sorry, I don't have enough context/knowledge
> > to understand what you're getting at. zram has been doing
> > writeback for ages, I really don't know what you mean by
> > "to act like this".
>
> I mean, if zram is formatted as ext4, and then mount it;
> and then there is a backing file which is also in another
> ext4, you'd need a workqueue to do writeback I/Os (or needs
> a loop device to transit), was that the original question
> raised by Yuwen?
We take pages of data from zram0 and write them straight to
the backing device. Those writes don't go through vfs/fs so
fs on the backing device will simply be corrupted, as far as
I can tell. This is not intendant use case for zram writeback.
next prev parent reply other threads:[~2025-11-23 0:08 UTC|newest]
Thread overview: 37+ messages / expand[flat|nested] mbox.gz Atom feed top
2025-11-20 15:21 Sergey Senozhatsky
2025-11-20 15:21 ` [RFC PATCHv5 1/6] " Sergey Senozhatsky
2025-11-21 7:05 ` Yuwen Chen
2025-11-21 7:18 ` Sergey Senozhatsky
2025-11-21 7:40 ` Hannes Reinecke
2025-11-21 7:47 ` Sergey Senozhatsky
2025-11-20 15:21 ` [RFC PATCHv5 2/6] zram: add writeback batch size device attr Sergey Senozhatsky
2025-11-20 15:57 ` Brian Geffon
2025-11-21 1:56 ` Sergey Senozhatsky
2025-11-21 2:48 ` Sergey Senozhatsky
2025-11-20 15:21 ` [RFC PATCHv5 3/6] zram: take write lock in wb limit store handlers Sergey Senozhatsky
2025-11-20 16:03 ` Brian Geffon
2025-11-20 15:21 ` [RFC PATCHv5 4/6] zram: drop wb_limit_lock Sergey Senozhatsky
2025-11-20 16:03 ` Brian Geffon
2025-11-20 15:21 ` [RFC PATCHv5 5/6] zram: rework bdev block allocation Sergey Senozhatsky
2025-11-20 16:35 ` Brian Geffon
2025-11-20 15:21 ` [RFC PATCHv5 6/6] zram: read slot block idx under slot lock Sergey Senozhatsky
2025-11-20 18:13 ` Brian Geffon
2025-11-24 14:49 ` Brian Geffon
2025-11-21 7:14 ` [RFC PATCHv5 0/6] zram: introduce writeback bio batching Yuwen Chen
2025-11-21 7:32 ` Sergey Senozhatsky
2025-11-21 7:44 ` Yuwen Chen
2025-11-21 7:58 ` Sergey Senozhatsky
2025-11-21 8:23 ` Yuwen Chen
2025-11-21 9:12 ` Sergey Senozhatsky
2025-11-21 12:21 ` Gao Xiang
2025-11-21 12:43 ` Gao Xiang
2025-11-22 10:07 ` Sergey Senozhatsky
2025-11-22 12:24 ` Gao Xiang
2025-11-22 13:43 ` Sergey Senozhatsky
2025-11-22 14:09 ` Gao Xiang
2025-11-23 0:08 ` Sergey Senozhatsky [this message]
2025-11-23 1:23 ` Gao Xiang
2025-11-23 3:07 ` Sergey Senozhatsky
2025-11-23 0:22 ` Sergey Senozhatsky
2025-11-23 1:39 ` Gao Xiang
[not found] ` <tencent_D7ED79431EC0D75957539121B7CC7897EB06@qq.com>
2025-12-20 11:14 ` Sergey Senozhatsky
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