[libvirt] [PATCH 4/4] perf: add ref_cpu_cycles perf event support
John Ferlan
jferlan at redhat.com
Tue Dec 13 22:40:30 UTC 2016
On 12/13/2016 11:01 AM, Nitesh Konkar wrote:
> This patch adds support and documentation for
> the ref_cpu_cycles perf event.
>
> Signed-off-by: Nitesh Konkar <nitkon12 at linux.vnet.ibm.com>
> ---
> docs/formatdomain.html.in | 6 ++++++
> docs/news.html.in | 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 | 5 ++++-
> src/util/virperf.h | 5 +++--
> tests/genericxml2xmlindata/generic-perf.xml | 1 +
> tools/virsh.pod | 5 ++++-
> 10 files changed, 35 insertions(+), 6 deletions(-)
>
It there some sort of "better" or "short" explanation for this counter?
I looked via google, but it's not 100% clear if I could transcribe what
I read. If you have something - just provide it and I can insert
appropriately.
Otherwise some similar comments here as before...
John
> diff --git a/docs/formatdomain.html.in b/docs/formatdomain.html.in
> index 6cff639..3dbd449 100644
> --- a/docs/formatdomain.html.in
> +++ b/docs/formatdomain.html.in
> @@ -1932,6 +1932,7 @@
> <event name='bus_cycles' enabled='no'/>
> <event name='stalled_cycles_frontend' enabled='no'/>
> <event name='stalled_cycles_backend' enabled='no'/>
> + <event name='ref_cpu_cycles' enabled='no'/>
> </perf>
> ...
> </pre>
> @@ -2002,6 +2003,11 @@
> <td>the count of stalled cycles backend by applications running on the platform</td>
> <td><code>perf.stalled_cycles_backend</code></td>
> </tr>
> + <tr>
> + <td><code>ref_cpu_cycles</code></td>
> + <td>the count of ref cpu cycles by applications running on the platform</td>
> + <td><code>perf.ref_cpu_cycles</code></td>
> + </tr>
> </table>
>
> <h3><a name="elementsDevices">Devices</a></h3>
> diff --git a/docs/news.html.in b/docs/news.html.in
> index 4e0a4da..21c7de1 100644
> --- a/docs/news.html.in
> +++ b/docs/news.html.in
> @@ -32,8 +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, stalled cycles backend by applications
> - running on the platform
> + frontend, stalled cycles backend and ref cpu cycles
> + by applications running on the platform
stalled backend cpu cycles, and ref cpu cycles
> </li>
> </ul>
> </li>
> diff --git a/docs/schemas/domaincommon.rng b/docs/schemas/domaincommon.rng
> index e5b5fb5..4d76315 100644
> --- a/docs/schemas/domaincommon.rng
> +++ b/docs/schemas/domaincommon.rng
> @@ -432,6 +432,7 @@
> <value>bus_cycles</value>
> <value>stalled_cycles_frontend</value>
> <value>stalled_cycles_backend</value>
> + <value>ref_cpu_cycles</value>
> </choice>
> </attribute>
> <attribute name="enabled">
> diff --git a/include/libvirt/libvirt-domain.h b/include/libvirt/libvirt-domain.h
> index 86db4ae..1723f83 100644
> --- a/include/libvirt/libvirt-domain.h
> +++ b/include/libvirt/libvirt-domain.h
> @@ -2175,6 +2175,16 @@ void virDomainStatsRecordListFree(virDomainStatsRecordPtr *stats);
> */
> # define VIR_PERF_PARAM_STALLED_CYCLES_BACKEND "stalled_cycles_backend"
>
> +/**
> + * VIR_PERF_PARAM_REF_CPU_CYCLES:
> + *
> + * Macro for typed parameter name that represents ref_cpu_cycles
> + * perf event which can be used to measure the count of ref cpu cycles
> + * by applications running on the platform. It corresponds to the
> + * "perf.ref_cpu_cycles" field in the *Stats APIs.
> + */
> +# define VIR_PERF_PARAM_REF_CPU_CYCLES "ref_cpu_cycles"
> +
> int virDomainGetPerfEvents(virDomainPtr dom,
> virTypedParameterPtr *params,
> int *nparams,
> diff --git a/src/libvirt-domain.c b/src/libvirt-domain.c
> index de865b0..09d45c9 100644
> --- a/src/libvirt-domain.c
> +++ b/src/libvirt-domain.c
> @@ -11242,6 +11242,9 @@ virConnectGetDomainCapabilities(virConnectPtr conn,
> * "perf.stalled_cycles_backend" - The count of stalled cycles backend
> * as unsigned long long. It is produced
> * by stalled_cycles_backend perf event.
> + * "perf.ref_cpu_cycles" - The count of ref cpu cycles as unsigned
> + * long long. It is produced by
> + * ref_cpu_cycles perf event.
The extra spacing isn't required. As "neat" at it could look with
everything justified under the longest "-" - everything needs to be
changed and all the descriptions get spread over too many lines. Just
go with "perf.value" - Explanation
> *
> * 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 cf92e43..398aefc 100644
> --- a/src/qemu/qemu_driver.c
> +++ b/src/qemu/qemu_driver.c
> @@ -9857,6 +9857,7 @@ qemuDomainSetPerfEvents(virDomainPtr dom,
> 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,
> + VIR_PERF_PARAM_REF_CPU_CYCLES, VIR_TYPED_PARAM_BOOLEAN,
> NULL) < 0)
> return -1;
>
> diff --git a/src/util/virperf.c b/src/util/virperf.c
> index c9a0e39..49ec258 100644
> --- a/src/util/virperf.c
> +++ b/src/util/virperf.c
> @@ -43,7 +43,7 @@ VIR_ENUM_IMPL(virPerfEvent, VIR_PERF_EVENT_LAST,
> "cache_references", "cache_misses",
> "branch_instructions", "branch_misses",
> "bus_cycles", "stalled_cycles_frontend",
> - "stalled_cycles_backend");
> + "stalled_cycles_backend", "ref_cpu_cycles");
>
> struct virPerfEvent {
> int type;
> @@ -103,6 +103,9 @@ static struct virPerfEventAttr attrs[] = {
> {.type = VIR_PERF_EVENT_STALLED_CYCLES_BACKEND,
> .attrType = PERF_TYPE_HARDWARE,
> .attrConfig = PERF_COUNT_HW_STALLED_CYCLES_BACKEND},
> + {.type = VIR_PERF_EVENT_REF_CPU_CYCLES,
> + .attrType = PERF_TYPE_HARDWARE,
> + .attrConfig = PERF_COUNT_HW_REF_CPU_CYCLES},
> };
> typedef struct virPerfEventAttr *virPerfEventAttrPtr;
>
> diff --git a/src/util/virperf.h b/src/util/virperf.h
> index 6dfad34..c002510 100644
> --- a/src/util/virperf.h
> +++ b/src/util/virperf.h
> @@ -40,8 +40,9 @@ typedef enum {
> for applications */
> 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_STALLED_CYCLES_FRONTEND, /* Count of stalled cycles frontend */
> + VIR_PERF_EVENT_STALLED_CYCLES_BACKEND, /* Count of stalled cycles backend */
> + VIR_PERF_EVENT_REF_CPU_CYCLES, /* Count of ref cpu cycles */
>
> VIR_PERF_EVENT_LAST
> } virPerfEventType;
> diff --git a/tests/genericxml2xmlindata/generic-perf.xml b/tests/genericxml2xmlindata/generic-perf.xml
> index f01d574..437cd65 100644
> --- a/tests/genericxml2xmlindata/generic-perf.xml
> +++ b/tests/genericxml2xmlindata/generic-perf.xml
> @@ -25,6 +25,7 @@
> <event name='bus_cycles' enabled='yes'/>
> <event name='stalled_cycles_frontend' enabled='yes'/>
> <event name='stalled_cycles_backend' enabled='yes'/>
> + <event name='ref_cpu_cycles' enabled='yes'/>
> </perf>
> <devices>
> </devices>
> diff --git a/tools/virsh.pod b/tools/virsh.pod
> index ada1dce..539717c 100644
> --- a/tools/virsh.pod
> +++ b/tools/virsh.pod
> @@ -950,7 +950,8 @@ I<--perf> returns the statistics of all enabled perf events:
> "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_backend" - the count of stalled cycles backend
> +"perf.stalled_cycles_backend" - the count of stalled cycles backend,
> +"perf.ref_cpu_cycles" - the count of ref cpu cycles
>
> See the B<perf> command for more details about each event.
>
> @@ -2310,6 +2311,8 @@ B<Valid perf event names>
> stalled_cycles_backend - Provides the count of stalled cycles
> backend by applications running on
> the platform.
> + ref_cpu_cycles - Provides the count of ref cpu cycles
> + 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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