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From:   Chuck Lever III <chuck.lever@oracle.com>
To:     Olga Kornievskaia <olga.kornievskaia@gmail.com>
CC:     Dai Ngo <dai.ngo@oracle.com>,
        Linux NFS Mailing List <linux-nfs@vger.kernel.org>,
        Trond Myklebust <trondmy@hammerspace.com>,
        Bruce Fields <bfields@fieldses.org>
Subject: Re: [PATCH v2 0/2] enhance NFSv4.2 SSC to delay unmount source's
 export. 
Thread-Topic: [PATCH v2 0/2] enhance NFSv4.2 SSC to delay unmount source's
 export. 
Thread-Index: AQHXKBgu9IXq70YdMUCq9qUqUB+L96qntQoA
Date:   Tue, 6 Apr 2021 16:33:47 +0000
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> On Apr 2, 2021, at 7:30 PM, Dai Ngo <dai.ngo@oracle.com> wrote:
>=20
> Hi,
>=20
> Currently the source's export is mounted and unmounted on every
> inter-server copy operation. This causes unnecessary overhead
> for each copy.
>=20
> This patch series is an enhancement to allow the export to remain
> mounted for a configurable period (default to 15 minutes). If the=20
> export is not being used for the configured time it will be unmounted
> by a delayed task. If it's used again then its expiration time is
> extended for another period.
>=20
> Since mount and unmount are no longer done on each copy request,
> this overhead is no longer used to decide whether the copy should
> be done with inter-server copy or generic copy. The threshold used
> to determine sync or async copy is now used for this decision.
>=20
> -Dai
>=20
> v2: fix compiler warning of missing prototype.

Hi Olga-

I'm getting ready to shrink-wrap the initial NFSD v5.13 pull request.
Have you had a chance to review Dai's patches?


--
Chuck Lever