Doug / smarc-fsl-linux-kernel

21 Sep, 2012

1 commit

  • bcf6edcd6   perf kvm: Events analysis tool ... Browse Code »

    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: Dong Hao
    Signed-off-by: Runzhen Wang
    [ Dong Hao
    Runzhen Wang :
    - rebase it on current acme's tree
    - fix the compiling-error on i386 ]
    Signed-off-by: Xiao Guangrong
    Acked-by: David Ahern
    Cc: Avi Kivity
    Cc: David Ahern
    Cc: Ingo Molnar
    Cc: Marcelo Tosatti
    Cc: kvm@vger.kernel.org
    Cc: Runzhen Wang
    Link: http://lkml.kernel.org/r/1347870675-31495-4-git-send-email-haodong@linux.vnet.ibm.com
    Signed-off-by: Arnaldo Carvalho de Melo

    Xiao Guangrong
     

02 Dec, 2010

1 commit

24 Apr, 2010

1 commit

  • cfadf9d4a   perf: Some perf-kvm documentation edits ... Browse Code »

    asciidoc does not allow the "===" to be longer than the line
    above it.
    Also fix a couple types and formatting errors.

    Signed-off-by: William Cohen
    Cc: Peter Zijlstra
    Cc: Arnaldo Carvalho de Melo
    Cc: Paul Mackerras
    Cc: Ingo Molnar
    LKML-Reference:
    Signed-off-by: Frederic Weisbecker

    William Cohen
     

19 Apr, 2010

1 commit