[Date Prev][Date Next]   [Thread Prev][Thread Next]   [Thread Index] [Date Index] [Author Index]

Re: [libvirt] [PATCH 4/9] perf: add context_switches software perf event support




On 01/27/2017 06:01 AM, Nitesh Konkar wrote:
> This patch adds support and documentation
> for the context_switches perf event.
> 
> Signed-off-by: Nitesh Konkar <nitkon12 linux vnet ibm com>
> ---
>  docs/formatdomain.html.in                   |  6 ++++++
>  docs/news.xml                               |  4 ++--
>  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                             |  3 +++
>  10 files changed, 33 insertions(+), 3 deletions(-)
> 
> diff --git a/docs/formatdomain.html.in b/docs/formatdomain.html.in
> index 2071eea..4ed6e02 100644
> --- a/docs/formatdomain.html.in
> +++ b/docs/formatdomain.html.in
> @@ -1940,6 +1940,7 @@
>    &lt;event name='cpu_clock' enabled='no'/&gt;
>    &lt;event name='task_clock' enabled='no'/&gt;
>    &lt;event name='page_faults' enabled='no'/&gt;
> +  &lt;event name='context_switches' enabled='no'/&gt;
>  &lt;/perf&gt;
>  ...
>  </pre>
> @@ -2033,6 +2034,11 @@
>        <td>the count of page faults by applications running on the platform</td>
>        <td><code>perf.page_faults</code></td>
>      </tr>
> +    <tr>
> +      <td><code>context_switches</code></td>
> +      <td>the count of context switches by applications running on the platform</td>
> +      <td><code>perf.context_switches</code></td>
> +    </tr>
>    </table>
>  
>      <h3><a name="elementsDevices">Devices</a></h3>
> diff --git a/docs/news.xml b/docs/news.xml
> index 14beed6..fb872f5 100644
> --- a/docs/news.xml
> +++ b/docs/news.xml
> @@ -137,8 +137,8 @@
>            Add support to get the count of branch instructions
>            executed, branch misses, bus cycles, stalled frontend
>            cpu cycles, stalled backend cpu cycles, ref cpu cycles,
> -          cpu clock, task clock and page faults by applications
> -          running on the platform.
> +          cpu clock, task clock, page faults and context switches
> +          by applications running on the platform.

Remove news.xml from this patch... like previous...


>          </description>
>        </change>
>        <change>
> diff --git a/docs/schemas/domaincommon.rng b/docs/schemas/domaincommon.rng
> index a7727e7..e4e1358 100644
> --- a/docs/schemas/domaincommon.rng
> +++ b/docs/schemas/domaincommon.rng
> @@ -436,6 +436,7 @@
>                <value>cpu_clock</value>
>                <value>task_clock</value>
>                <value>page_faults</value>
> +              <value>context_switches</value>
>              </choice>
>            </attribute>
>            <attribute name="enabled">
> diff --git a/include/libvirt/libvirt-domain.h b/include/libvirt/libvirt-domain.h
> index 36619b5..e71bfa7 100644
> --- a/include/libvirt/libvirt-domain.h
> +++ b/include/libvirt/libvirt-domain.h
> @@ -2218,6 +2218,16 @@ void virDomainStatsRecordListFree(virDomainStatsRecordPtr *stats);
>  */
>  # define VIR_PERF_PARAM_PAGE_FAULTS "page_faults"
>  
> +/**
> + * VIR_PERF_PARAM_CONTEXT_SWITCHES:
> + *
> + * Macro for typed parameter name that represents context_switches
> + * perf event which can be used to measure the count of context
> + * switches by applications running on the platform. It corresponds
> + * to the "perf.context_switches" field in the *Stats APIs.
> + */
> +# define VIR_PERF_PARAM_CONTEXT_SWITCHES "context_switches"
> +
>  
>  int virDomainGetPerfEvents(virDomainPtr dom,
>                             virTypedParameterPtr *params,
> diff --git a/src/libvirt-domain.c b/src/libvirt-domain.c
> index a923acc..42720f1 100644
> --- a/src/libvirt-domain.c
> +++ b/src/libvirt-domain.c
> @@ -11256,6 +11256,9 @@ virConnectGetDomainCapabilities(virConnectPtr conn,
>   *                         produced by the task_clock perf event.
>   *     "perf.page_faults" - The count of page faults as unsigned long long. It is
>   *                         produced by the page_faults perf event.
> + *     "perf.context_switches" - The count of context switches as unsigned long
> + *                               long. It is produced by the context_switches
> + *                               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 88f649e..c579b61 100644
> --- a/src/qemu/qemu_driver.c
> +++ b/src/qemu/qemu_driver.c
> @@ -9552,6 +9552,7 @@ qemuDomainSetPerfEvents(virDomainPtr dom,
>                                 VIR_PERF_PARAM_CPU_CLOCK, VIR_TYPED_PARAM_BOOLEAN,
>                                 VIR_PERF_PARAM_TASK_CLOCK, VIR_TYPED_PARAM_BOOLEAN,
>                                 VIR_PERF_PARAM_PAGE_FAULTS, VIR_TYPED_PARAM_BOOLEAN,
> +                               VIR_PERF_PARAM_CONTEXT_SWITCHES, VIR_TYPED_PARAM_BOOLEAN,
>                                 NULL) < 0)
>          return -1;
>  
> diff --git a/src/util/virperf.c b/src/util/virperf.c
> index 3282aca..c004061 100644
> --- a/src/util/virperf.c
> +++ b/src/util/virperf.c
> @@ -44,7 +44,8 @@ VIR_ENUM_IMPL(virPerfEvent, VIR_PERF_EVENT_LAST,
>                "branch_instructions", "branch_misses",
>                "bus_cycles", "stalled_cycles_frontend",
>                "stalled_cycles_backend", "ref_cpu_cycles",
> -              "cpu_clock", "task_clock", "page_faults");
> +              "cpu_clock", "task_clock", "page_faults",
> +              "context_switches");
>  
>  struct virPerfEvent {
>      int type;
> @@ -122,6 +123,9 @@ static struct virPerfEventAttr attrs[] = {
>      {.type = VIR_PERF_EVENT_PAGE_FAULTS,
>       .attrType = PERF_TYPE_SOFTWARE,
>       .attrConfig = PERF_COUNT_SW_PAGE_FAULTS},
> +    {.type = VIR_PERF_EVENT_CONTEXT_SWITCHES,
> +     .attrType = PERF_TYPE_SOFTWARE,
> +     .attrConfig = PERF_COUNT_SW_CONTEXT_SWITCHES},
>  };
>  typedef struct virPerfEventAttr *virPerfEventAttrPtr;
>  
> diff --git a/src/util/virperf.h b/src/util/virperf.h
> index fbc5ae3..b937d9a 100644
> --- a/src/util/virperf.h
> +++ b/src/util/virperf.h
> @@ -50,6 +50,7 @@ typedef enum {
>      VIR_PERF_EVENT_CPU_CLOCK,   /* Count of cpu clock */
>      VIR_PERF_EVENT_TASK_CLOCK,   /* Count of task clock */
>      VIR_PERF_EVENT_PAGE_FAULTS,   /* Count of page faults */
> +    VIR_PERF_EVENT_CONTEXT_SWITCHES,   /* Count of context switches */
>  
>      VIR_PERF_EVENT_LAST
>  } virPerfEventType;
> diff --git a/tests/genericxml2xmlindata/generic-perf.xml b/tests/genericxml2xmlindata/generic-perf.xml
> index 3f27887..29a2273 100644
> --- a/tests/genericxml2xmlindata/generic-perf.xml
> +++ b/tests/genericxml2xmlindata/generic-perf.xml
> @@ -29,6 +29,7 @@
>      <event name='cpu_clock' enabled='yes'/>
>      <event name='task_clock' enabled='yes'/>
>      <event name='page_faults' enabled='yes'/>
> +    <event name='context_switches' enabled='yes'/>
>    </perf>
>    <devices>
>    </devices>
> diff --git a/tools/virsh.pod b/tools/virsh.pod
> index f7be74e..d0bf016 100644
> --- a/tools/virsh.pod
> +++ b/tools/virsh.pod
> @@ -949,6 +949,7 @@ I<--perf> returns the statistics of all enabled perf events:
>  "perf.cpu_clock" - the count of cpu clock
>  "perf.task_clock" - the count of task clock
>  "perf.page_faults" - the count of page faults
> +"perf.context_switches" - the count of context switches
>  
>  See the B<perf> command for more details about each event.
>  
> @@ -2319,6 +2320,8 @@ B<Valid perf event names>
>                 running on the platform
>    page_faults - Provides the count of page faults by applications
>                  running on the platform
> +  context_switches - Provides the count of context switches by applications
> +                     running on the platform

This description needs to have it's formatting fixed a bit - to not go
past the 80 column windows.. After building use man tools/virsh.1 with
an 80 column wide terminal.

John
>  
>  B<Note>: The statistics can be retrieved using the B<domstats> command using
>  the I<--perf> flag.
> 


[Date Prev][Date Next]   [Thread Prev][Thread Next]   [Thread Index] [Date Index] [Author Index]