Re: [RFC PATCH 3/4] KVM: stats: Add ioctl commands to pull statistics in binary format

[Date Prev][Date Next][Thread Prev][Thread Next][Date Index][Thread Index]

 



On 10/03/21 16:51, Marc Zyngier wrote:
+	kvm_for_each_vcpu(j, vcpu, kvm) {
+		pdata = data + VM_STAT_COUNT;
+		for (i = 0; i < VCPU_STAT_COUNT; i++, pdata++)
+			*pdata += *((u64 *)&vcpu->stat + i);
Do you really need the in-kernel copy? Why not directly organise the
data structures in a way that would allow a bulk copy using
copy_to_user()?

The result is built by summing per-vCPU counters, so that the counter updates are fast and do not require a lock. So consistency basically cannot be guaranteed.

Paolo




[Index of Archives]     [KVM ARM]     [KVM ia64]     [KVM ppc]     [Virtualization Tools]     [Spice Development]     [Libvirt]     [Libvirt Users]     [Linux USB Devel]     [Linux Audio Users]     [Yosemite Questions]     [Linux Kernel]     [Linux SCSI]     [XFree86]

  Powered by Linux