Re: [RFC PATCH v4 0/9] implement containerized syncfs for overlayfs

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On Fri, Dec 4, 2020 at 3:50 PM Chengguang Xu <cgxu519@xxxxxxxxxxxx> wrote:
>
>  ---- 在 星期五, 2020-11-13 14:55:46 Chengguang Xu <cgxu519@xxxxxxxxxxxx> 撰写 ----
>  > 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.
>
> Hi Miklos,
>
> I think this version has addressed all previous issues and comments from Jack
> and Amir.  Have you got time to review this patch series?

Hopefully yes.

I'm really keen to finish off the unprivileged overlay patches first.
Will test and post a new version shortly.

Thanks,
Miklos




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