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perf: add task_clock software perf event support

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This patch adds support and documentation for
the task_clock perf event.

Signed-off-by: Nitesh Konkar <nitkon12@linux.vnet.ibm.com>
This commit is contained in:
Nitesh Konkar 2017-02-23 20:25:31 +05:30 committed by John Ferlan
parent f372a862ac
commit 20dc690865
9 changed files with 32 additions and 1 deletions
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8
docs/formatdomain.html.in
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@ -1948,6 +1948,7 @@
&lt;event name='stalled_cycles_backend' enabled='no'/&gt;
&lt;event name='ref_cpu_cycles' enabled='no'/&gt;
&lt;event name='cpu_clock' enabled='no'/&gt;
&lt;event name='task_clock' enabled='no'/&gt;
&lt;/perf&gt;
...
</pre>
@ -2033,6 +2034,13 @@
the platform</td>
<td><code>perf.cpu_clock</code></td>
</tr>
<tr>
<td><code>task_clock</code></td>
<td>the count of task clock time, as measured by a monotonic
high-resolution CPU timer, specific to the task that
is run by applications running on the platform</td>
<td><code>perf.task_clock</code></td>
</tr>
</table>
<h3><a name="elementsDevices">Devices</a></h3>

1
docs/schemas/domaincommon.rng
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@ -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">

11
include/libvirt/libvirt-domain.h
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@ -2199,6 +2199,17 @@ 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 time 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,

2
src/libvirt-domain.c
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@ -11252,6 +11252,8 @@ virConnectGetDomainCapabilities(virConnectPtr conn,
* ref_cpu_cycles perf event.
* "perf.cpu_clock" - The count of cpu clock time as unsigned long long.
* It is produced by the cpu_clock perf event.
* "perf.task_clock" - The count of task clock time 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

1
src/qemu/qemu_driver.c
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@ -9568,6 +9568,7 @@ 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;

5
src/util/virperf.c
View File

@ -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},
};
typedef struct virPerfEventAttr *virPerfEventAttrPtr;

1
src/util/virperf.h
View File

@ -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 time*/
VIR_PERF_EVENT_TASK_CLOCK, /* Count of task clock time*/
VIR_PERF_EVENT_LAST
} virPerfEventType;

1
tests/genericxml2xmlindata/generic-perf.xml
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@ -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>

3
tools/virsh.pod
View File

@ -965,6 +965,7 @@ I<--perf> returns the statistics of all enabled perf events:
cpu cycles
"perf.ref_cpu_cycles" - the count of ref cpu cycles
"perf.cpu_clock" - the count of cpu clock time
"perf.task_clock" - the count of task clock time
See the B<perf> command for more details about each event.
@ -2336,6 +2337,8 @@ 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.
B<Note>: The statistics can be retrieved using the B<domstats> command using
the I<--perf> flag.