linux-kernel - Re: [PATCH 3/3] ovl: redirect on rename-dir

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Message-ID: <CAJfpeguB-RRFbuwy=csPxoByKC=FTxYyuvnm+rmfTUmkVX+K9w@mail.gmail.com>
Date:   Mon, 7 Nov 2016 11:04:04 +0100
From:   Miklos Szeredi <miklos@...redi.hu>
To:     Konstantin Khlebnikov <koct9i@...il.com>
Cc:     Raphael Hertzog <hertzog@...ian.org>,
        Miklos Szeredi <mszeredi@...hat.com>,
        "linux-unionfs@...r.kernel.org" <linux-unionfs@...r.kernel.org>,
        Guillem Jover <guillem@...ian.org>,
        linux-fsdevel <linux-fsdevel@...r.kernel.org>,
        Linux Kernel Mailing List <linux-kernel@...r.kernel.org>
Subject: Re: [PATCH 3/3] ovl: redirect on rename-dir

On Mon, Nov 7, 2016 at 10:58 AM, Konstantin Khlebnikov <koct9i@...il.com> wrote:

> I've stumbled on somehow related problem - concurrent copy-ups are
> strictly serialized by rename locks.
> Obviously, file copying could be done in parallel: locks are required
> only for final rename.
> Because of that overlay slower that aufs for some workloads.

Easy to fix: for each copy up create a separate subdir of "work".
Then the contention is only for the time of creating the subdir, which
is very short.

Thanks,
Miklos