FW: Descriptions about KVM performance counters

["Hailong Yang" <hailong.yang1115@gmail.com>]

Anyone please commits or provides any useful insights? Really appreciate~


Hailong

> -----Original Message-----
> From: Hailong Yang [mailto:hailong.yang1115@gmail.com]
> Sent: Tuesday, May 15, 2012 6:48 PM
> To: kvm@vger.kernel.org
> Subject: Descriptions about KVM performance counters
> 
> Dear all,
> 
> Is there a brief description or any document about the meanings of kvm
> performance events traced by 'perf' command? Some of events are hard to
> guess what they are standing for. And also is there any correlation or
exact
> mapping between the output of 'kvm_stat' and the perf kvm events? Another
> question is, since the kvm guest vm is executed as a user level process,
does
> that mean I can only account for the user level performance events when I
am
> trying to profile the performance of guest VM with 'perf' command?
> 
> [root@dell06 ~]# perf list | grep kvm
>   kvmmmu:kvm_mmu_pagetable_walk                      [Tracepoint
> event]
>   kvmmmu:kvm_mmu_paging_element                      [Tracepoint
> event]
>   kvmmmu:kvm_mmu_set_accessed_bit                    [Tracepoint
> event]
>   kvmmmu:kvm_mmu_set_dirty_bit                       [Tracepoint
> event]
>   kvmmmu:kvm_mmu_walker_error                        [Tracepoint
> event]
>   kvmmmu:kvm_mmu_get_page
> [Tracepoint event]
>   kvmmmu:kvm_mmu_sync_page                           [Tracepoint
> event]
>   kvmmmu:kvm_mmu_unsync_page                         [Tracepoint
> event]
>   kvmmmu:kvm_mmu_zap_page
> [Tracepoint event]
>   kvm:kvm_entry                                      [Tracepoint
> event]
>   kvm:kvm_hypercall                                  [Tracepoint
> event]
>   kvm:kvm_pio                                        [Tracepoint
> event]
>   kvm:kvm_cpuid                                      [Tracepoint
> event]
>   kvm:kvm_apic                                       [Tracepoint
> event]
>   kvm:kvm_exit                                       [Tracepoint
> event]
>   kvm:kvm_inj_virq                                   [Tracepoint
> event]
>   kvm:kvm_inj_exception                              [Tracepoint
> event]
>   kvm:kvm_page_fault                                 [Tracepoint
> event]
>   kvm:kvm_msr                                        [Tracepoint
> event]
>   kvm:kvm_cr                                         [Tracepoint
> event]
>   kvm:kvm_pic_set_irq                                [Tracepoint
> event]
>   kvm:kvm_apic_ipi                                   [Tracepoint
> event]
>   kvm:kvm_apic_accept_irq                            [Tracepoint
> event]
>   kvm:kvm_set_irq                                    [Tracepoint
> event]
>   kvm:kvm_ioapic_set_irq                             [Tracepoint
> event]
>   kvm:kvm_msi_set_irq                                [Tracepoint
> event]
>   kvm:kvm_ack_irq                                    [Tracepoint
> event]
>   kvm:kvm_mmio                                       [Tracepoint
> event]
> 
> [root@dell06 ~]# kvm_stat
> kvm statistics
> 
>  efer_reload                  0       0
>  exits                 11777822     258
>  fpu_reload              158860       1
>  halt_exits              931986      70
>  halt_wakeup              70117       2
>  host_state_reload      3780899      70
>  hypercalls                   0       0
>  insn_emulation         5203509     178
>  insn_emulation_fail          0       0
>  invlpg                       0       0
>  io_exits               2580247       0
>  irq_exits              1610751       8
>  irq_injections         1930867      71
>  irq_window               79641       0
>  largepages                2501       0
>  mmio_exits              183399       0
>  mmu_cache_miss             604       0
>  mmu_flooded                  0       0
>  mmu_pde_zapped               0       0
>  mmu_pte_updated              0       0
>  mmu_pte_write             1000       0
>  mmu_recycled                 0       0
>  mmu_shadow_zapped          748       0
>  mmu_unsync                   0       0
>  nmi_injections               0       0
>  nmi_window                   0       0
>  pf_fixed                 44196       0
>  pf_guest                     0       0
>  remote_tlb_flush           519       0
>  request_irq                  0       0
>  signal_exits                 0       0
>  tlb_flush                    0       0
> 
> 
> Best Regards
> 
> Hailong