linux-ext4 - Re: code questions about ext4_inode_datasync

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Message-Id: <90D76828-C2EE-459A-A190-8E4FB51CE118@dilger.ca>
Date:   Mon, 18 Jan 2021 20:40:47 -0700
From:   Andreas Dilger <adilger@...ger.ca>
To:     Jan Kara <jack@...e.cz>
Cc:     Xiaoguang Wang <xiaoguang.wang@...ux.alibaba.com>,
        Ext4 Developers List <linux-ext4@...r.kernel.org>,
        joseph qi <joseph.qi@...ux.alibaba.com>
Subject: Re: code questions about ext4_inode_datasync_dirty()

On Jan 13, 2021, at 10:19 AM, Jan Kara <jack@...e.cz> wrote:
> 
> Hi!
> 
> On Tue 12-01-21 19:45:06, Xiaoguang Wang wrote:
>> I use io_uring to evaluate ext4 randread performance(direct io), observed
>> obvious overhead in jbd2_transaction_committed():

I was going to ask about this - is the filesystem mounted with noatime or
relatime or lazytime?  Otherwise, it may be a lot of atime updates that are
causing all of this journal traffic in what _should_ be a read-only workload?

Cheers, Andreas






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