• Xiao Guangrong's avatar
    perf kvm: Events analysis tool · bcf6edcd
    Xiao Guangrong authored
    Add 'perf kvm stat' support to analyze kvm vmexit/mmio/ioport smartly
    
    Usage:
    - kvm stat
      run a command and gather performance counter statistics, it is the alias of
      perf stat
    
    - trace kvm events:
      perf kvm stat record, or, if other tracepoints are interesting as well, we
      can append the events like this:
      perf kvm stat record -e timer:* -a
    
      If many guests are running, we can track the specified guest by using -p or
      --pid, -a is used to track events generated by all guests.
    
    - show the result:
      perf kvm stat report
    
    The output example is following:
    13005
    13059
    
    total 2 guests are running on the host
    
    Then, track the guest whose pid is 13059:
    ^C[ perf record: Woken up 1 times to write data ]
    [ perf record: Captured and wrote 0.253 MB perf.data.guest (~11065 samples) ]
    
    See the vmexit events:
    
    Analyze events for all VCPUs:
    
                 VM-EXIT    Samples  Samples%     Time%         Avg time
    
             APIC_ACCESS        460    70.55%     0.01%     22.44us ( +-   1.75% )
                     HLT         93    14.26%    99.98% 832077.26us ( +-  10.42% )
      EXTERNAL_INTERRUPT         64     9.82%     0.00%     35.35us ( +-  14.21% )
       PENDING_INTERRUPT         24     3.68%     0.00%      9.29us ( +-  31.39% )
               CR_ACCESS          7     1.07%     0.00%      8.12us ( +-   5.76% )
          IO_INSTRUCTION          3     0.46%     0.00%     18.00us ( +-  11.79% )
           EXCEPTION_NMI          1     0.15%     0.00%      5.83us ( +-   -nan% )
    
    Total Samples:652, Total events handled time:77396109.80us.
    
    See the mmio events:
    
    Analyze events for all VCPUs:
    
             MMIO Access    Samples  Samples%     Time%         Avg time
    
            0xfee00380:W        387    84.31%    79.28%      8.29us ( +-   3.32% )
            0xfee00300:W         24     5.23%     9.96%     16.79us ( +-   1.97% )
            0xfee00300:R         24     5.23%     7.83%     13.20us ( +-   3.00% )
            0xfee00310:W         24     5.23%     2.93%      4.94us ( +-   3.84% )
    
    Total Samples:459, Total events handled time:4044.59us.
    
    See the ioport event:
    
    Analyze events for all VCPUs:
    
          IO Port Access    Samples  Samples%     Time%         Avg time
    
             0xc050:POUT          3   100.00%   100.00%     13.75us ( +-  10.83% )
    
    Total Samples:3, Total events handled time:41.26us.
    
    And, --vcpu is used to track the specified vcpu and --key is used to sort the
    result:
    
    Analyze events for VCPU 0:
    
                 VM-EXIT    Samples  Samples%     Time%         Avg time
    
                     HLT         27    13.85%    99.97% 405790.24us ( +-  12.70% )
      EXTERNAL_INTERRUPT         13     6.67%     0.00%     27.94us ( +-  22.26% )
             APIC_ACCESS        146    74.87%     0.03%     21.69us ( +-   2.91% )
          IO_INSTRUCTION          2     1.03%     0.00%     17.77us ( +-  20.56% )
               CR_ACCESS          2     1.03%     0.00%      8.55us ( +-   6.47% )
       PENDING_INTERRUPT          5     2.56%     0.00%      6.27us ( +-   3.94% )
    
    Total Samples:195, Total events handled time:10959950.90us.
    Signed-off-by: default avatarDong Hao <haodong@linux.vnet.ibm.com>
    Signed-off-by: default avatarRunzhen Wang <runzhen@linux.vnet.ibm.com>
    [ Dong Hao <haodong@linux.vnet.ibm.com>
      Runzhen Wang <runzhen@linux.vnet.ibm.com>:
         - rebase it on current acme's tree
         - fix the compiling-error on i386 ]
    Signed-off-by: default avatarXiao Guangrong <xiaoguangrong@linux.vnet.ibm.com>
    Acked-by: default avatarDavid Ahern <dsahern@gmail.com>
    Cc: Avi Kivity <avi@redhat.com>
    Cc: David Ahern <dsahern@gmail.com>
    Cc: Ingo Molnar <mingo@kernel.org>
    Cc: Marcelo Tosatti <mtosatti@redhat.com>
    Cc: kvm@vger.kernel.org
    Cc: Runzhen Wang <runzhen@linux.vnet.ibm.com>
    Link: http://lkml.kernel.org/r/1347870675-31495-4-git-send-email-haodong@linux.vnet.ibm.comSigned-off-by: default avatarArnaldo Carvalho de Melo <acme@redhat.com>
    bcf6edcd
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