[libvirt] [PATCH 3/4] perf: add stalled_cycles_backend perf event support

John Ferlan jferlan at redhat.com
Tue Dec 13 22:30:42 UTC 2016



On 12/13/2016 11:01 AM, Nitesh Konkar wrote:
> This patch adds support and documentation for
> the stalled_cycles_backend perf event.
> 
> Signed-off-by: Nitesh Konkar <nitkon12 at linux.vnet.ibm.com>
> ---
>  docs/formatdomain.html.in                   |  6 ++++++
>  docs/news.html.in                           |  3 ++-
>  docs/schemas/domaincommon.rng               |  1 +
>  include/libvirt/libvirt-domain.h            | 10 ++++++++++
>  src/libvirt-domain.c                        |  3 +++
>  src/qemu/qemu_driver.c                      |  1 +
>  src/util/virperf.c                          |  6 +++++-
>  src/util/virperf.h                          |  1 +
>  tests/genericxml2xmlindata/generic-perf.xml |  1 +
>  tools/virsh.pod                             |  6 +++++-
>  10 files changed, 35 insertions(+), 3 deletions(-)
> 

Similar adjustments here regarding short/longer explanations for what
the field is - just used 'backend' instead of 'frontend'


John
> diff --git a/docs/formatdomain.html.in b/docs/formatdomain.html.in
> index 424b4de..6cff639 100644
> --- a/docs/formatdomain.html.in
> +++ b/docs/formatdomain.html.in
> @@ -1931,6 +1931,7 @@
>    <event name='branch_misses' enabled='no'/>
>    <event name='bus_cycles' enabled='no'/>
>    <event name='stalled_cycles_frontend' enabled='no'/>
> +  <event name='stalled_cycles_backend' enabled='no'/>
>  </perf>
>  ...
>  </pre>
> @@ -1996,6 +1997,11 @@
>        <td>the count of stalled cycles frontend by applications running on the platform</td>
>        <td><code>perf.stalled_cycles_frontend</code></td>
>      </tr>
> +    <tr>
> +      <td><code>stalled_cycles_backend</code></td>
> +      <td>the count of stalled cycles backend by applications running on the platform</td>
> +      <td><code>perf.stalled_cycles_backend</code></td>
> +    </tr>
>    </table>
>  
>      <h3><a name="elementsDevices">Devices</a></h3>
> diff --git a/docs/news.html.in b/docs/news.html.in
> index ea91d99..4e0a4da 100644
> --- a/docs/news.html.in
> +++ b/docs/news.html.in
> @@ -32,7 +32,8 @@
>            <li>perf: Add more perf statistics<br/>
>            Add support to get the count of branch instructions
>            executed, branch misses, bus cycles, stalled cycles
> -          frontend by applications running on the platform
> +          frontend, stalled cycles backend by applications
> +          running on the platform
>            </li>
>          </ul>
>        </li>
> diff --git a/docs/schemas/domaincommon.rng b/docs/schemas/domaincommon.rng
> index 9ce7cc9..e5b5fb5 100644
> --- a/docs/schemas/domaincommon.rng
> +++ b/docs/schemas/domaincommon.rng
> @@ -431,6 +431,7 @@
>                <value>branch_misses</value>
>                <value>bus_cycles</value>
>                <value>stalled_cycles_frontend</value>
> +              <value>stalled_cycles_backend</value>
>              </choice>
>            </attribute>
>            <attribute name="enabled">
> diff --git a/include/libvirt/libvirt-domain.h b/include/libvirt/libvirt-domain.h
> index 0741d14..86db4ae 100644
> --- a/include/libvirt/libvirt-domain.h
> +++ b/include/libvirt/libvirt-domain.h
> @@ -2165,6 +2165,16 @@ void virDomainStatsRecordListFree(virDomainStatsRecordPtr *stats);
>   */
>  # define VIR_PERF_PARAM_STALLED_CYCLES_FRONTEND "stalled_cycles_frontend"
>  
> +/**
> + * VIR_PERF_PARAM_STALLED_CYCLES_BACKEND:
> + *
> + * Macro for typed parameter name that represents stalled_cycles_backend
> + * perf event which can be used to measure the count of stalled cycles backend
> + * by applications running on the platform. It corresponds to the
> + * "perf.stalled_cycles_backend" field in the *Stats APIs.
> + */
> +# define VIR_PERF_PARAM_STALLED_CYCLES_BACKEND "stalled_cycles_backend"
> +
>  int virDomainGetPerfEvents(virDomainPtr dom,
>                             virTypedParameterPtr *params,
>                             int *nparams,
> diff --git a/src/libvirt-domain.c b/src/libvirt-domain.c
> index 0d23d31..de865b0 100644
> --- a/src/libvirt-domain.c
> +++ b/src/libvirt-domain.c
> @@ -11239,6 +11239,9 @@ virConnectGetDomainCapabilities(virConnectPtr conn,
>   *     "perf.stalled_cycles_frontend" - The count of stalled cycles frontend
>   *                                      as unsigned long long. It is produced
>   *                                      by stalled_cycles_frontend perf event.
> + *     "perf.stalled_cycles_backend"  - The count of stalled cycles backend
> + *                                      as unsigned long long. It is produced
> + *                                      by stalled_cycles_backend perf event.
>   *
>   * Note that entire stats groups or individual stat fields may be missing from
>   * the output in case they are not supported by the given hypervisor, are not
> diff --git a/src/qemu/qemu_driver.c b/src/qemu/qemu_driver.c
> index 273dbeb..cf92e43 100644
> --- a/src/qemu/qemu_driver.c
> +++ b/src/qemu/qemu_driver.c
> @@ -9856,6 +9856,7 @@ qemuDomainSetPerfEvents(virDomainPtr dom,
>                                 VIR_PERF_PARAM_BRANCH_MISSES, VIR_TYPED_PARAM_BOOLEAN,
>                                 VIR_PERF_PARAM_BUS_CYCLES, VIR_TYPED_PARAM_BOOLEAN,
>                                 VIR_PERF_PARAM_STALLED_CYCLES_FRONTEND, VIR_TYPED_PARAM_BOOLEAN,
> +                               VIR_PERF_PARAM_STALLED_CYCLES_BACKEND, VIR_TYPED_PARAM_BOOLEAN,
>                                 NULL) < 0)
>          return -1;
>  
> diff --git a/src/util/virperf.c b/src/util/virperf.c
> index c21147a..c9a0e39 100644
> --- a/src/util/virperf.c
> +++ b/src/util/virperf.c
> @@ -42,7 +42,8 @@ VIR_ENUM_IMPL(virPerfEvent, VIR_PERF_EVENT_LAST,
>                "cpu_cycles", "instructions",
>                "cache_references", "cache_misses",
>                "branch_instructions", "branch_misses",
> -              "bus_cycles", "stalled_cycles_frontend");
> +              "bus_cycles", "stalled_cycles_frontend",
> +              "stalled_cycles_backend");
>  
>  struct virPerfEvent {
>      int type;
> @@ -99,6 +100,9 @@ static struct virPerfEventAttr attrs[] = {
>      {.type = VIR_PERF_EVENT_STALLED_CYCLES_FRONTEND,
>       .attrType = PERF_TYPE_HARDWARE,
>       .attrConfig = PERF_COUNT_HW_STALLED_CYCLES_FRONTEND},
> +    {.type = VIR_PERF_EVENT_STALLED_CYCLES_BACKEND,
> +     .attrType = PERF_TYPE_HARDWARE,
> +     .attrConfig = PERF_COUNT_HW_STALLED_CYCLES_BACKEND},
>  };
>  typedef struct virPerfEventAttr *virPerfEventAttrPtr;
>  
> diff --git a/src/util/virperf.h b/src/util/virperf.h
> index 0aee1ba..6dfad34 100644
> --- a/src/util/virperf.h
> +++ b/src/util/virperf.h
> @@ -41,6 +41,7 @@ typedef enum {
>      VIR_PERF_EVENT_BRANCH_MISSES,  /* Count of branch misses for applications */
>      VIR_PERF_EVENT_BUS_CYCLES,       /* Count of bus cycles for applications*/
>      VIR_PERF_EVENT_STALLED_CYCLES_FRONTEND, /*Count of stalled cycles frontend*/
> +    VIR_PERF_EVENT_STALLED_CYCLES_BACKEND, /*Count of stalled cycles backend*/
>  
>      VIR_PERF_EVENT_LAST
>  } virPerfEventType;
> diff --git a/tests/genericxml2xmlindata/generic-perf.xml b/tests/genericxml2xmlindata/generic-perf.xml
> index db76843..f01d574 100644
> --- a/tests/genericxml2xmlindata/generic-perf.xml
> +++ b/tests/genericxml2xmlindata/generic-perf.xml
> @@ -24,6 +24,7 @@
>      <event name='branch_misses' enabled='yes'/>
>      <event name='bus_cycles' enabled='yes'/>
>      <event name='stalled_cycles_frontend' enabled='yes'/>
> +    <event name='stalled_cycles_backend' enabled='yes'/>
>    </perf>
>    <devices>
>    </devices>
> diff --git a/tools/virsh.pod b/tools/virsh.pod
> index f9a6a19..ada1dce 100644
> --- a/tools/virsh.pod
> +++ b/tools/virsh.pod
> @@ -949,7 +949,8 @@ I<--perf> returns the statistics of all enabled perf events:
>  "perf.branch_instructions" - the count of branch instructions,
>  "perf.branch_misses" - the count of branch misses,
>  "perf.bus_cycles" - the count of bus cycles,
> -"perf.stalled_cycles_frontend" - the count of stalled cycles frontend
> +"perf.stalled_cycles_frontend" - the count of stalled cycles frontend,
> +"perf.stalled_cycles_backend" - the count of stalled cycles backend
>  
>  See the B<perf> command for more details about each event.
>  
> @@ -2306,6 +2307,9 @@ B<Valid perf event names>
>    stalled_cycles_frontend - Provides the count of stalled cycles
>                              frontend by applications running on
>                              the platform.
> +  stalled_cycles_backend -  Provides the count of stalled cycles
> +                            backend by applications running on
> +                            the platform.
>  
>  B<Note>: The statistics can be retrieved using the B<domstats> command using
>  the I<--perf> flag.
> 




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