[libvirt] [PATCH 2/9] perf: add task_clock software perf event support
John Ferlan
jferlan at redhat.com
Thu Feb 9 21:42:32 UTC 2017
On 01/27/2017 06:01 AM, Nitesh Konkar wrote:
> This patch adds support and documentation for
> the task_clock perf event.
>
> Signed-off-by: Nitesh Konkar <nitkon12 at linux.vnet.ibm.com>
> ---
> docs/formatdomain.html.in | 6 ++++++
> docs/news.xml | 5 +++--
> docs/schemas/domaincommon.rng | 1 +
> include/libvirt/libvirt-domain.h | 10 ++++++++++
> src/libvirt-domain.c | 2 ++
> src/qemu/qemu_driver.c | 1 +
> src/util/virperf.c | 5 ++++-
> src/util/virperf.h | 1 +
> tests/genericxml2xmlindata/generic-perf.xml | 1 +
> tools/virsh.pod | 3 +++
> 10 files changed, 32 insertions(+), 3 deletions(-)
>
> diff --git a/docs/formatdomain.html.in b/docs/formatdomain.html.in
> index e44e758..1ed5db7 100644
> --- a/docs/formatdomain.html.in
> +++ b/docs/formatdomain.html.in
> @@ -1938,6 +1938,7 @@
> <event name='stalled_cycles_backend' enabled='no'/>
> <event name='ref_cpu_cycles' enabled='no'/>
> <event name='cpu_clock' enabled='no'/>
> + <event name='task_clock' enabled='no'/>
> </perf>
> ...
> </pre>
> @@ -2021,6 +2022,11 @@
> <td>the count of cpu clock by applications running on the platform</td>
> <td><code>perf.cpu_clock</code></td>
> </tr>
> + <tr>
> + <td><code>task_clock</code></td>
> + <td>the count of task clock by applications running on the platform</td>
> + <td><code>perf.task_clock</code></td>
Similar to 1/9 - the count of task clock by applications..." doesn't
convey enough meaning... Need a bit more description...
> + </tr>
> </table>
>
> <h3><a name="elementsDevices">Devices</a></h3>
> diff --git a/docs/news.xml b/docs/news.xml
> index ec113ab..38373c0 100644
> --- a/docs/news.xml
> +++ b/docs/news.xml
> @@ -136,8 +136,9 @@
> <description>
> 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
> - and cpu clock by applications running on the platform.
> + cpu cycles, stalled backend cpu cycles, ref cpu cycles,
> + cpu clock and task clock by applications running on the
> + platform.
same issue w/ news as last patch...
> </description>
> </change>
> <change>
> diff --git a/docs/schemas/domaincommon.rng b/docs/schemas/domaincommon.rng
> index 86a39c8..6ee2c6f 100644
> --- a/docs/schemas/domaincommon.rng
> +++ b/docs/schemas/domaincommon.rng
> @@ -434,6 +434,7 @@
> <value>stalled_cycles_backend</value>
> <value>ref_cpu_cycles</value>
> <value>cpu_clock</value>
> + <value>task_clock</value>
> </choice>
> </attribute>
> <attribute name="enabled">
> diff --git a/include/libvirt/libvirt-domain.h b/include/libvirt/libvirt-domain.h
> index bffe955..f4f1c74 100644
> --- a/include/libvirt/libvirt-domain.h
> +++ b/include/libvirt/libvirt-domain.h
> @@ -2198,6 +2198,16 @@ void virDomainStatsRecordListFree(virDomainStatsRecordPtr *stats);
> */
> # define VIR_PERF_PARAM_CPU_CLOCK "cpu_clock"
>
> +/**
> + * VIR_PERF_PARAM_TASK_CLOCK:
> + *
> + * Macro for typed parameter name that represents task_clock
> + * perf event which can be used to measure the count of task
> + * clock by applications running on the platform. It corresponds
> + * to the "perf.task_clock" field in the *Stats APIs.
> + */
> +# define VIR_PERF_PARAM_TASK_CLOCK "task_clock"
> +
> int virDomainGetPerfEvents(virDomainPtr dom,
> virTypedParameterPtr *params,
> int *nparams,
> diff --git a/src/libvirt-domain.c b/src/libvirt-domain.c
> index 001cdd7..6875848 100644
> --- a/src/libvirt-domain.c
> +++ b/src/libvirt-domain.c
> @@ -11252,6 +11252,8 @@ virConnectGetDomainCapabilities(virConnectPtr conn,
> * ref_cpu_cycles perf event.
> * "perf.cpu_clock" - The count of cpu clock as unsigned long long. It is
> * produced by the cpu_clock perf event.
> + * "perf.task_clock" - The count of task clock as unsigned long long. It is
> + * produced by the task_clock 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 ff4803c..285156d 100644
> --- a/src/qemu/qemu_driver.c
> +++ b/src/qemu/qemu_driver.c
> @@ -9550,6 +9550,7 @@ qemuDomainSetPerfEvents(virDomainPtr dom,
> VIR_PERF_PARAM_STALLED_CYCLES_BACKEND, VIR_TYPED_PARAM_BOOLEAN,
> VIR_PERF_PARAM_REF_CPU_CYCLES, VIR_TYPED_PARAM_BOOLEAN,
> VIR_PERF_PARAM_CPU_CLOCK, VIR_TYPED_PARAM_BOOLEAN,
> + VIR_PERF_PARAM_TASK_CLOCK, VIR_TYPED_PARAM_BOOLEAN,
> NULL) < 0)
> return -1;
>
> diff --git a/src/util/virperf.c b/src/util/virperf.c
> index 3629e5b..e19cfea 100644
> --- a/src/util/virperf.c
> +++ b/src/util/virperf.c
> @@ -44,7 +44,7 @@ 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");
> + "cpu_clock", "task_clock");
>
> struct virPerfEvent {
> int type;
> @@ -116,6 +116,9 @@ static struct virPerfEventAttr attrs[] = {
> {.type = VIR_PERF_EVENT_CPU_CLOCK,
> .attrType = PERF_TYPE_SOFTWARE,
> .attrConfig = PERF_COUNT_SW_CPU_CLOCK},
> + {.type = VIR_PERF_EVENT_TASK_CLOCK,
> + .attrType = PERF_TYPE_SOFTWARE,
> + .attrConfig = PERF_COUNT_SW_TASK_CLOCK}
Need to add the "," after the } here not in next patch.
> };
> typedef struct virPerfEventAttr *virPerfEventAttrPtr;
>
> diff --git a/src/util/virperf.h b/src/util/virperf.h
> index 81f1e20..b9e8a75 100644
> --- a/src/util/virperf.h
> +++ b/src/util/virperf.h
> @@ -48,6 +48,7 @@ typedef enum {
> processor pipeline */
> VIR_PERF_EVENT_REF_CPU_CYCLES, /* Count of ref cpu cycles */
> VIR_PERF_EVENT_CPU_CLOCK, /* Count of cpu clock */
> + VIR_PERF_EVENT_TASK_CLOCK, /* Count of task clock */
>
> VIR_PERF_EVENT_LAST
> } virPerfEventType;
> diff --git a/tests/genericxml2xmlindata/generic-perf.xml b/tests/genericxml2xmlindata/generic-perf.xml
> index 3e7834e..5ebc0a2 100644
> --- a/tests/genericxml2xmlindata/generic-perf.xml
> +++ b/tests/genericxml2xmlindata/generic-perf.xml
> @@ -27,6 +27,7 @@
> <event name='stalled_cycles_backend' enabled='yes'/>
> <event name='ref_cpu_cycles' enabled='yes'/>
> <event name='cpu_clock' enabled='yes'/>
> + <event name='task_clock' enabled='yes'/>
> </perf>
> <devices>
> </devices>
> diff --git a/tools/virsh.pod b/tools/virsh.pod
> index 2f0bf36..958e473 100644
> --- a/tools/virsh.pod
> +++ b/tools/virsh.pod
> @@ -947,6 +947,7 @@ I<--perf> returns the statistics of all enabled perf events:
> "perf.stalled_cycles_backend" - the count of stalled backend cpu cycles,
> "perf.ref_cpu_cycles" - the count of ref cpu cycles
> "perf.cpu_clock" - the count of cpu clock
> +"perf.task_clock" - the count of task clock
>
> See the B<perf> command for more details about each event.
>
> @@ -2313,6 +2314,8 @@ B<Valid perf event names>
> applications running on the platform.
> cpu_clock - Provides the cpu clock time consumed by applications
> running on the platform.
> + task_clock - Provides the task clock time consumed by applications
> + running on the platform
Again a bit more descriptive here which needs to be propagated elsewhere.
John
>
> B<Note>: The statistics can be retrieved using the B<domstats> command using
> the I<--perf> flag.
>
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