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Re: [Qemu-devel] [RFC Patch 11/12] IXGBEVF: Migrate VF statistic data
From: |
Michael S. Tsirkin |
Subject: |
Re: [Qemu-devel] [RFC Patch 11/12] IXGBEVF: Migrate VF statistic data |
Date: |
Thu, 22 Oct 2015 15:36:50 +0300 |
On Thu, Oct 22, 2015 at 12:37:43AM +0800, Lan Tianyu wrote:
> VF statistic regs are read-only and can't be migrated via writing back
> directly.
>
> Currently, statistic data returned to user space by the driver is not equal
> to value of statistic regs. VF driver records value of statistic regs as base
> data
> when net interface is up or open, calculate increased count of regs during
> last period of online service and added it to saved_reset data. When user
> space collects statistic data, VF driver returns result of
> "current - base + saved_reset". "Current" is reg value at that point.
>
> Restoring net function after migration just likes net interface is up or open.
> Call existed function to update base and saved_reset data to keep statistic
> data continual during migration.
>
> Signed-off-by: Lan Tianyu <address@hidden>
> ---
> drivers/net/ethernet/intel/ixgbevf/ixgbevf_main.c | 3 +++
> 1 file changed, 3 insertions(+)
>
> diff --git a/drivers/net/ethernet/intel/ixgbevf/ixgbevf_main.c
> b/drivers/net/ethernet/intel/ixgbevf/ixgbevf_main.c
> index 04b6ce7..d22160f 100644
> --- a/drivers/net/ethernet/intel/ixgbevf/ixgbevf_main.c
> +++ b/drivers/net/ethernet/intel/ixgbevf/ixgbevf_main.c
> @@ -3005,6 +3005,7 @@ int ixgbevf_live_mg(struct ixgbevf_adapter *adapter)
> return 0;
>
> del_timer_sync(&adapter->service_timer);
> + ixgbevf_update_stats(adapter);
> pr_info("migration start\n");
> migration_status = MIGRATION_IN_PROGRESS;
>
So far, it seems that the only two things done when
starting migration are very small.
It doesn't seem worth it to let guests defer migration for things like
this. Surely, cancelling a timer can be done later after VM is
migrated?
> @@ -3017,6 +3018,8 @@ int ixgbevf_live_mg(struct ixgbevf_adapter *adapter)
> return 1;
>
> ixgbevf_restore_state(adapter);
> + ixgbevf_save_reset_stats(adapter);
> + ixgbevf_init_last_counter_stats(adapter);
> migration_status = MIGRATION_COMPLETED;
> pr_info("migration end\n");
> return 0;
> --
> 1.8.4.rc0.1.g8f6a3e5.dirty
>
> --
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- Re: [Qemu-devel] [RFC Patch 06/12] IXGBEVF: Add self emulation layer, (continued)
[Qemu-devel] [RFC Patch 05/12] IXGBE: Add new sysfs interface of "notify_vf", Lan Tianyu, 2015/10/22
- Re: [Qemu-devel] [RFC Patch 05/12] IXGBE: Add new sysfs interface of "notify_vf", Alexander Duyck, 2015/10/21
- Re: [Qemu-devel] [RFC Patch 05/12] IXGBE: Add new sysfs interface of "notify_vf", Michael S. Tsirkin, 2015/10/22
- Re: [Qemu-devel] [RFC Patch 05/12] IXGBE: Add new sysfs interface of "notify_vf", Lan, Tianyu, 2015/10/24
- Re: [Qemu-devel] [RFC Patch 05/12] IXGBE: Add new sysfs interface of "notify_vf", Alexander Duyck, 2015/10/25
- Re: [Qemu-devel] [RFC Patch 05/12] IXGBE: Add new sysfs interface of "notify_vf", Lan, Tianyu, 2015/10/25
[Qemu-devel] [RFC Patch 04/12] IXGBE: Add ixgbe_ping_vf() to notify a specified VF via mailbox msg., Lan Tianyu, 2015/10/22
[Qemu-devel] [RFC Patch 11/12] IXGBEVF: Migrate VF statistic data, Lan Tianyu, 2015/10/22
- Re: [Qemu-devel] [RFC Patch 11/12] IXGBEVF: Migrate VF statistic data,
Michael S. Tsirkin <=
[Qemu-devel] [RFC Patch 10/12] IXGBEVF: Add lock to protect tx/rx ring operation, Lan Tianyu, 2015/10/22
Re: [Qemu-devel] [RFC Patch 00/12] IXGBE: Add live migration support for SRIOV NIC, Michael S. Tsirkin, 2015/10/22
Re: [Qemu-devel] [RFC Patch 00/12] IXGBE: Add live migration support for SRIOV NIC, Alexander Duyck, 2015/10/23