linux-kernel - Re: [PATCH block/for-linus] writeback: fix syncing of I_DIRTY

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Date:	Fri, 21 Aug 2015 18:20:53 +0800
From:	Eryu Guan <eguan@...hat.com>
To:	Dave Chinner <david@...morbit.com>
Cc:	Tejun Heo <tj@...nel.org>, Jens Axboe <axboe@...nel.dk>,
	Jan Kara <jack@...e.cz>, linux-kernel@...r.kernel.org,
	xfs@....sgi.com, axboe@...com, Jan Kara <jack@...e.com>,
	linux-fsdevel@...r.kernel.org, kernel-team@...com
Subject: Re: [PATCH block/for-linus] writeback: fix syncing of I_DIRTY_TIME
 inodes

On Wed, Aug 19, 2015 at 07:56:11AM +1000, Dave Chinner wrote:
> On Tue, Aug 18, 2015 at 12:54:39PM -0700, Tejun Heo wrote:
[snip]
> 
> I'd suggest looking at some of the XFS tracepoints during the test:
> 
> tracepoint			trigger
> xfs_file_buffered_write		once per write syscall
> xfs_file_sync			once per fsync per inode
> xfs_vm_writepage		every ->writepage call
> xfs_setfilesize			every IO completion that updates inode size
> 
> And it's probably best to also include all the writeback
> tracepoints, too, for context. That will tell you what inodes and
> what part of them are getting written back and when....

I finally reproduced generic/048 with both xfs and writeback tracepoints
enabled, please download the trace dat file and trace report file from

http://128.199.137.77/writeback/

Thanks,
Eryu
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