From: Jason Gunthorpe <jgg@nvidia.com>
To: "Tian, Kevin" <kevin.tian@intel.com>
Cc: Yishai Hadas <yishaih@nvidia.com>,
"alex.williamson@redhat.com" <alex.williamson@redhat.com>,
"bhelgaas@google.com" <bhelgaas@google.com>,
"saeedm@nvidia.com" <saeedm@nvidia.com>,
"linux-pci@vger.kernel.org" <linux-pci@vger.kernel.org>,
"kvm@vger.kernel.org" <kvm@vger.kernel.org>,
"netdev@vger.kernel.org" <netdev@vger.kernel.org>,
"kuba@kernel.org" <kuba@kernel.org>,
"leonro@nvidia.com" <leonro@nvidia.com>,
"kwankhede@nvidia.com" <kwankhede@nvidia.com>,
"mgurtovoy@nvidia.com" <mgurtovoy@nvidia.com>,
"maorg@nvidia.com" <maorg@nvidia.com>,
"Raj, Ashok" <ashok.raj@intel.com>,
"shameerali.kolothum.thodi@huawei.com"
<shameerali.kolothum.thodi@huawei.com>
Subject: Re: [PATCH V7 mlx5-next 15/15] vfio: Extend the device migration protocol with PRE_COPY
Date: Tue, 22 Feb 2022 11:50:46 -0400 [thread overview]
Message-ID: <20220222155046.GC10061@nvidia.com> (raw)
In-Reply-To: <BN9PR11MB5276C05DBC8C5E79154891B08C3B9@BN9PR11MB5276.namprd11.prod.outlook.com>
On Tue, Feb 22, 2022 at 01:43:13AM +0000, Tian, Kevin wrote:
> > > > + * Drivers should attempt to return estimates so that initial_bytes +
> > > > + * dirty_bytes matches the amount of data an immediate transition to
> > > > STOP_COPY
> > > > + * will require to be streamed.
> > >
> > > I didn't understand this requirement. In an immediate transition to
> > > STOP_COPY I expect the amount of data covers the entire device
> > > state, i.e. initial_bytes. dirty_bytes are dynamic and iteratively returned
> > > then why we need set some expectation on the sum of
> > > initial+round1_dity+round2_dirty+...
> >
> > "will require to be streamed" means additional data from this point
> > forward, not including anything already sent.
> >
> > It turns into the estimate of how long STOP_COPY will take.
>
> I still didn't get the 'match' part. Why should the amount of data which
> has already been sent match the additional data to be sent in STOP_COPY?
None of it is 'already been sent' the return values are always 'still
to be sent'
Jason
next prev parent reply other threads:[~2022-02-22 15:50 UTC|newest]
Thread overview: 50+ messages / expand[flat|nested] mbox.gz Atom feed top
2022-02-07 17:22 [PATCH V7 mlx5-next 00/15] Add mlx5 live migration driver and v2 migration protocol Yishai Hadas
2022-02-07 17:22 ` [PATCH V7 mlx5-next 01/15] PCI/IOV: Add pci_iov_vf_id() to get VF index Yishai Hadas
2022-02-07 17:22 ` [PATCH V7 mlx5-next 02/15] net/mlx5: Reuse exported virtfn index function call Yishai Hadas
2022-02-07 17:22 ` [PATCH V7 mlx5-next 03/15] net/mlx5: Disable SRIOV before PF removal Yishai Hadas
2022-02-07 17:22 ` [PATCH V7 mlx5-next 04/15] PCI/IOV: Add pci_iov_get_pf_drvdata() to allow VF reaching the drvdata of a PF Yishai Hadas
2022-02-07 17:22 ` [PATCH V7 mlx5-next 05/15] net/mlx5: Expose APIs to get/put the mlx5 core device Yishai Hadas
2022-02-07 17:22 ` [PATCH V7 mlx5-next 06/15] net/mlx5: Introduce migration bits and structures Yishai Hadas
2022-02-07 17:22 ` [PATCH V7 mlx5-next 07/15] vfio: Have the core code decode the VFIO_DEVICE_FEATURE ioctl Yishai Hadas
2022-02-07 17:22 ` [PATCH V7 mlx5-next 08/15] vfio: Define device migration protocol v2 Yishai Hadas
2022-02-09 0:07 ` Alex Williamson
2022-02-09 2:36 ` Jason Gunthorpe
2022-02-15 10:41 ` Tian, Kevin
2022-02-15 16:04 ` Jason Gunthorpe
2022-02-15 23:32 ` Alex Williamson
2022-02-16 1:17 ` Jason Gunthorpe
2022-02-16 3:17 ` Tian, Kevin
2022-02-16 12:14 ` Jason Gunthorpe
2022-02-17 2:29 ` Tian, Kevin
2022-02-15 10:58 ` Tian, Kevin
2022-02-15 13:13 ` Jason Gunthorpe
2022-02-15 8:04 ` Tian, Kevin
2022-02-15 15:33 ` Jason Gunthorpe
2022-02-16 3:04 ` Tian, Kevin
2022-02-07 17:22 ` [PATCH V7 mlx5-next 09/15] vfio: Extend the device migration protocol with RUNNING_P2P Yishai Hadas
2022-02-15 10:18 ` Tian, Kevin
2022-02-15 15:56 ` Jason Gunthorpe
2022-02-16 2:52 ` Tian, Kevin
2022-02-16 12:11 ` Jason Gunthorpe
2022-02-07 17:22 ` [PATCH V7 mlx5-next 10/15] vfio: Remove migration protocol v1 documentation Yishai Hadas
2022-02-11 11:03 ` Cornelia Huck
2022-02-07 17:22 ` [PATCH V7 mlx5-next 11/15] vfio/mlx5: Expose migration commands over mlx5 device Yishai Hadas
2022-02-07 17:22 ` [PATCH V7 mlx5-next 12/15] vfio/mlx5: Implement vfio_pci driver for mlx5 devices Yishai Hadas
2022-02-09 0:07 ` Alex Williamson
2022-02-07 17:22 ` [PATCH V7 mlx5-next 13/15] vfio/pci: Expose vfio_pci_core_aer_err_detected() Yishai Hadas
2022-02-07 17:22 ` [PATCH V7 mlx5-next 14/15] vfio/mlx5: Use its own PCI reset_done error handler Yishai Hadas
2022-02-09 0:08 ` Alex Williamson
2022-02-09 2:39 ` Jason Gunthorpe
2022-02-10 16:48 ` Alex Williamson
2022-02-10 17:27 ` Jason Gunthorpe
2022-02-07 17:22 ` [PATCH V7 mlx5-next 15/15] vfio: Extend the device migration protocol with PRE_COPY Yishai Hadas
2022-02-17 17:15 ` Alex Williamson
2022-02-18 0:03 ` Jason Gunthorpe
2022-02-18 8:01 ` Tian, Kevin
2022-02-18 14:06 ` Jason Gunthorpe
2022-02-22 1:43 ` Tian, Kevin
2022-02-22 15:50 ` Jason Gunthorpe [this message]
2022-02-23 0:40 ` Tian, Kevin
2022-02-23 0:44 ` Jason Gunthorpe
2022-02-23 1:46 ` Tian, Kevin
2022-02-18 8:11 ` [PATCH V7 mlx5-next 00/15] Add mlx5 live migration driver and v2 migration protocol Tarun Gupta (SW-GPU)
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