----- On Mar 13, 2017, at 6:15 PM, Dan McDonald [email protected] wrote:
[...]
> Tobias: Try this:
>
> dtrace -n 'gfn_to_memslot_unaliased:entry { printf("\nKVM 0x%p, number
> of
> memslots: %d\n", arg0, ((struct kvm_memslots *)((struct kvm
> *)arg0)->memslots)->nmemslots); stack(); exit(0);}'
>
> If your system is still running the same KVM instances, check for
> 0xfffffea4320ef000 as the KVM pointer.
when run repeatedly I mostly get
CPU ID FUNCTION:NAME
0 72630 gfn_to_memslot_unaliased:entry
KVM 0xfffffea38c8e3000, number of memslots: 35
kvm`gfn_to_hva+0x27
kvm`kvm_read_guest_page+0x29
kvm`kvm_read_guest+0x43
kvm`paging64_walk_addr+0xef
kvm`paging64_gva_to_gpa+0x43
kvm`kvm_read_guest_virt_helper+0x3e
kvm`kvm_fetch_guest_virt+0x62
kvm`do_fetch_insn_byte+0x70
kvm`do_insn_fetch+0x5e
kvm`x86_decode_insn+0x102
kvm`emulate_instruction+0xce
kvm`handle_apic_access+0x38
kvm`vmx_handle_exit+0x16a
kvm`vcpu_enter_guest+0x3ea
kvm`__vcpu_run+0x8b
kvm`kvm_arch_vcpu_ioctl_run+0x112
kvm`kvm_ioctl+0x466
genunix`cdev_ioctl+0x39
specfs`spec_ioctl+0x60
genunix`fop_ioctl+0x55
sometimes I also get
CPU ID FUNCTION:NAME
27 72630 gfn_to_memslot_unaliased:entry
KVM 0xfffffea38c8e3000, number of memslots: 35
kvm`gfn_to_memslot+0x1c
kvm`mapping_level+0x29
kvm`tdp_page_fault+0x89
kvm`kvm_mmu_page_fault+0x2c
kvm`handle_ept_violation+0x111
kvm`vmx_handle_exit+0x16a
kvm`vcpu_enter_guest+0x3ea
kvm`__vcpu_run+0x8b
kvm`kvm_arch_vcpu_ioctl_run+0x112
kvm`kvm_ioctl+0x466
genunix`cdev_ioctl+0x39
specfs`spec_ioctl+0x60
genunix`fop_ioctl+0x55
genunix`ioctl+0x9b
unix`sys_syscall+0x196
On a further note, about an hour ago most users have stopped using that
omnios-kvm instance
for interactive work as the hangs were getting too disruptive (before the vm
was running
5 xvnc servers with chrome and all the trimmings)
when I now run my 'testscript' on the machine, the long waits do not occur
anymore ...
which would indicate that the problem is somehow related to the load on the vm
...
chers
tobi
--
Tobi Oetiker, OETIKER+PARTNER AG, Aarweg 15 CH-4600 Olten, Switzerland
www.oetiker.ch [email protected] +41 62 775 9902
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