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From: Miklos Szeredi <miklos@szeredi.hu>
To: Chengguang Xu <cgxu519@mykernel.net>
Cc: Amir Goldstein <amir73il@gmail.com>, Jan Kara <jack@suse.cz>,
	overlayfs <linux-unionfs@vger.kernel.org>,
	linux-fsdevel@vger.kernel.org
Subject: Re: [RFC PATCH v2 0/8] implement containerized syncfs for overlayfs
Date: Fri, 30 Oct 2020 16:46:00 +0100
Message-ID: <CAJfpegu-bn2BjkLaykk-gZLRv71n=PgrsrwBnuAav1GHzWO5iQ@mail.gmail.com> (raw)
In-Reply-To: <20201025034117.4918-1-cgxu519@mykernel.net>

On Sun, Oct 25, 2020 at 4:42 AM Chengguang Xu <cgxu519@mykernel.net> wrote:
>
> Current syncfs(2) syscall on overlayfs just calls sync_filesystem()
> on upper_sb to synchronize whole dirty inodes in upper filesystem
> regardless of the overlay ownership of the inode. In the use case of
> container, when multiple containers using the same underlying upper
> filesystem, it has some shortcomings as below.
>
> (1) Performance
> Synchronization is probably heavy because it actually syncs unnecessary
> inodes for target overlayfs.
>
> (2) Interference
> Unplanned synchronization will probably impact IO performance of
> unrelated container processes on the other overlayfs.
>
> This series try to implement containerized syncfs for overlayfs so that
> only sync target dirty upper inodes which are belong to specific overlayfs
> instance. By doing this, it is able to reduce cost of synchronization and
> will not seriously impact IO performance of unrelated processes.

Series looks good at first glance.  Still need to do an in-depth review.

In the meantime can you post some numbers showing the performance improvements?

Thanks,
Miklos

  parent reply index

Thread overview: 23+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2020-10-25  3:41 Chengguang Xu
2020-10-25  3:41 ` [RFC PATCH v2 1/8] ovl: setup overlayfs' private bdi Chengguang Xu
2020-10-25  3:41 ` [RFC PATCH v2 2/8] ovl: implement ->writepages operation Chengguang Xu
2020-11-02 17:17   ` Jan Kara
2020-11-04 12:18     ` Chengguang Xu
2020-11-05 13:55       ` Jan Kara
2020-11-06  5:57         ` Chengguang Xu
2020-10-25  3:41 ` [RFC PATCH v2 3/8] ovl: implement overlayfs' ->evict_inode operation Chengguang Xu
2020-10-25  3:41 ` [RFC PATCH v2 4/8] ovl: mark overlayfs' inode dirty on modification Chengguang Xu
2020-10-25  3:41 ` [RFC PATCH v2 5/8] ovl: mark overlayfs' inode dirty on shared writable mmap Chengguang Xu
2020-11-02 17:30   ` Jan Kara
2020-11-04 11:54     ` Chengguang Xu
2020-11-05 14:03       ` Jan Kara
2020-11-05 14:21         ` Amir Goldstein
2020-11-05 15:54           ` Jan Kara
2020-11-06  2:41             ` Chengguang Xu
2020-11-06  8:50               ` Jan Kara
2020-11-06  9:47                 ` Chengguang Xu
2020-10-25  3:41 ` [RFC PATCH v2 6/8] ovl: implement overlayfs' ->write_inode operation Chengguang Xu
2020-10-25  3:41 ` [RFC PATCH v2 7/8] ovl: cache dirty overlayfs' inode Chengguang Xu
2020-10-25  3:41 ` [RFC PATCH v2 8/8] ovl: implement containerized syncfs for overlayfs Chengguang Xu
2020-10-30 15:46 ` Miklos Szeredi [this message]
2020-10-31 12:22   ` [RFC PATCH v2 0/8] " Chengguang Xu

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