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perf: add stalled_cycles_frontend perf event support

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

Signed-off-by: Nitesh Konkar <nitkon12@linux.vnet.ibm.com>
This commit is contained in:
Nitesh Konkar 2016-12-13 21:31:39 +05:30 committed by John Ferlan
parent 7d34731067
commit 060c159b08
10 changed files with 42 additions and 5 deletions
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7
docs/formatdomain.html.in
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@ -1930,6 +1930,7 @@
&lt;event name='branch_instructions' enabled='no'/&gt;
&lt;event name='branch_misses' enabled='no'/&gt;
&lt;event name='bus_cycles' enabled='no'/&gt;
&lt;event name='stalled_cycles_frontend' enabled='no'/&gt;
&lt;/perf&gt;
...
</pre>
@ -1990,6 +1991,12 @@
<td>the count of bus cycles by applications running on the platform</td>
<td><code>perf.bus_cycles</code></td>
</tr>
<tr>
<td><code>stalled_cycles_frontend</code></td>
<td>the count of stalled cpu cycles in the frontend of the instruction
processor pipeline by applications running on the platform</td>
<td><code>perf.stalled_cycles_frontend</code></td>
</tr>
</table>
<h3><a name="elementsDevices">Devices</a></h3>

6
docs/news.html.in
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@ -35,9 +35,9 @@
<li><strong>Improvements</strong>
<ul>
<li>perf: Add more perf statistics<br/>
Add support to get the count of branch instructions executed,
branch misses, and bus cycles by applications running on
the platform
Add support to get the count of branch instructions
executed, branch misses, bus cycles, and stalled frontend
cpu cycles by applications running on the platform
</li>
</ul>
</li>

1
docs/schemas/domaincommon.rng
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@ -430,6 +430,7 @@
<value>branch_instructions</value>
<value>branch_misses</value>
<value>bus_cycles</value>
<value>stalled_cycles_frontend</value>
</choice>
</attribute>
<attribute name="enabled">

11
include/libvirt/libvirt-domain.h
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@ -2155,6 +2155,17 @@ void virDomainStatsRecordListFree(virDomainStatsRecordPtr *stats);
*/
# define VIR_PERF_PARAM_BUS_CYCLES "bus_cycles"
/**
* VIR_PERF_PARAM_STALLED_CYCLES_FRONTEND:
*
* Macro for typed parameter name that represents stalled_cycles_frontend
* perf event which can be used to measure the count of stalled cpu cycles
* in the frontend of the instruction processor pipeline by applications
* running on the platform. It corresponds to the
* "perf.stalled_cycles_frontend" field in the *Stats APIs.
*/
# define VIR_PERF_PARAM_STALLED_CYCLES_FRONTEND "stalled_cycles_frontend"
int virDomainGetPerfEvents(virDomainPtr dom,
virTypedParameterPtr *params,
int *nparams,

5
src/libvirt-domain.c
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@ -11236,6 +11236,11 @@ virConnectGetDomainCapabilities(virConnectPtr conn,
* long. It is produced by branch_misses perf event.
* "perf.bus_cycles" - The count of bus cycles as unsigned long
* long. It is produced by bus_cycles perf event.
* "perf.stalled_cycles_frontend" - The count of stalled cpu cycles in the
* frontend of the instruction processor
* pipeline as unsigned long long. It is
* produced by stalled_cycles_frontend
* 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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@ -9856,6 +9856,7 @@ qemuDomainSetPerfEvents(virDomainPtr dom,
VIR_PERF_PARAM_BRANCH_INSTRUCTIONS, VIR_TYPED_PARAM_BOOLEAN,
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,
NULL) < 0)
return -1;

5
src/util/virperf.c
View File

@ -42,7 +42,7 @@ VIR_ENUM_IMPL(virPerfEvent, VIR_PERF_EVENT_LAST,
"cpu_cycles", "instructions",
"cache_references", "cache_misses",
"branch_instructions", "branch_misses",
"bus_cycles");
"bus_cycles", "stalled_cycles_frontend");
struct virPerfEvent {
int type;
@ -96,6 +96,9 @@ static struct virPerfEventAttr attrs[] = {
{.type = VIR_PERF_EVENT_BUS_CYCLES,
.attrType = PERF_TYPE_HARDWARE,
.attrConfig = PERF_COUNT_HW_BUS_CYCLES},
{.type = VIR_PERF_EVENT_STALLED_CYCLES_FRONTEND,
.attrType = PERF_TYPE_HARDWARE,
.attrConfig = PERF_COUNT_HW_STALLED_CYCLES_FRONTEND},
};
typedef struct virPerfEventAttr *virPerfEventAttrPtr;

3
src/util/virperf.h
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@ -40,6 +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 cpu cycles in
the frontend of the instruction
processor pipeline */
VIR_PERF_EVENT_LAST
} virPerfEventType;

1
tests/genericxml2xmlindata/generic-perf.xml
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@ -23,6 +23,7 @@
<event name='branch_instructions' enabled='yes'/>
<event name='branch_misses' enabled='yes'/>
<event name='bus_cycles' enabled='yes'/>
<event name='stalled_cycles_frontend' enabled='yes'/>
</perf>
<devices>
</devices>

7
tools/virsh.pod
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@ -948,7 +948,8 @@ I<--perf> returns the statistics of all enabled perf events:
"perf.cache_misses" - the count of caches misses,
"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.bus_cycles" - the count of bus cycles,
"perf.stalled_cycles_frontend" - the count of stalled frontend cpu cycles
See the B<perf> command for more details about each event.
@ -2302,6 +2303,10 @@ B<Valid perf event names>
by applications running on the platform.
bus_cycles - Provides the count of bus cycles executed
by applications running on the platform.
stalled_cycles_frontend - Provides the count of stalled cpu
cycles in the frontend of the
instruction processor pipeline by
applications running on the platform.
B<Note>: The statistics can be retrieved using the B<domstats> command using
the I<--perf> flag.