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perf: add stalled_cycles_backend perf event support

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

Signed-off-by: Nitesh Konkar <nitkon12@linux.vnet.ibm.com>
This commit is contained in:
Nitesh Konkar 2016-12-13 21:31:40 +05:30 committed by John Ferlan
parent 060c159b08
commit 9ae79400ff
10 changed files with 43 additions and 4 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

7
docs/formatdomain.html.in
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@ -1931,6 +1931,7 @@
&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;event name='stalled_cycles_backend' enabled='no'/&gt;
&lt;/perf&gt;
...
</pre>
@ -1997,6 +1998,12 @@
processor pipeline by applications running on the platform</td>
<td><code>perf.stalled_cycles_frontend</code></td>
</tr>
<tr>
<td><code>stalled_cycles_backend</code></td>
<td>the count of stalled cpu cycles in the backend of the instruction
processor pipeline by applications running on the platform</td>
<td><code>perf.stalled_cycles_backend</code></td>
</tr>
</table>
<h3><a name="elementsDevices">Devices</a></h3>

5
docs/news.html.in
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@ -36,8 +36,9 @@
<ul>
<li>perf: Add more perf statistics<br/>
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
executed, branch misses, bus cycles, stalled frontend
cpu cycles, and stalled backend cpu cycles by applications
running on the platform
</li>
</ul>
</li>

1
docs/schemas/domaincommon.rng
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@ -431,6 +431,7 @@
<value>branch_misses</value>
<value>bus_cycles</value>
<value>stalled_cycles_frontend</value>
<value>stalled_cycles_backend</value>
</choice>
</attribute>
<attribute name="enabled">

11
include/libvirt/libvirt-domain.h
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@ -2166,6 +2166,17 @@ void virDomainStatsRecordListFree(virDomainStatsRecordPtr *stats);
*/
# define VIR_PERF_PARAM_STALLED_CYCLES_FRONTEND "stalled_cycles_frontend"
/**
* VIR_PERF_PARAM_STALLED_CYCLES_BACKEND:
*
* Macro for typed parameter name that represents stalled_cycles_backend
* perf event which can be used to measure the count of stalled cpu cycles
* in the backend of the instruction processor pipeline by application
* running on the platform. It corresponds to the
* "perf.stalled_cycles_backend" field in the *Stats APIs.
*/
# define VIR_PERF_PARAM_STALLED_CYCLES_BACKEND "stalled_cycles_backend"
int virDomainGetPerfEvents(virDomainPtr dom,
virTypedParameterPtr *params,
int *nparams,

5
src/libvirt-domain.c
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@ -11241,6 +11241,11 @@ virConnectGetDomainCapabilities(virConnectPtr conn,
* pipeline as unsigned long long. It is
* produced by stalled_cycles_frontend
* perf event.
* "perf.stalled_cycles_backend" - The count of stalled cpu cycles in the
* backend of the instruction processor
* pipeline as unsigned long long. It is
* produced by stalled_cycles_backend
* 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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@ -9857,6 +9857,7 @@ qemuDomainSetPerfEvents(virDomainPtr dom,
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,
VIR_PERF_PARAM_STALLED_CYCLES_BACKEND, VIR_TYPED_PARAM_BOOLEAN,
NULL) < 0)
return -1;

6
src/util/virperf.c
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@ -42,7 +42,8 @@ VIR_ENUM_IMPL(virPerfEvent, VIR_PERF_EVENT_LAST,
"cpu_cycles", "instructions",
"cache_references", "cache_misses",
"branch_instructions", "branch_misses",
"bus_cycles", "stalled_cycles_frontend");
"bus_cycles", "stalled_cycles_frontend",
"stalled_cycles_backend");
struct virPerfEvent {
int type;
@ -99,6 +100,9 @@ static struct virPerfEventAttr attrs[] = {
{.type = VIR_PERF_EVENT_STALLED_CYCLES_FRONTEND,
.attrType = PERF_TYPE_HARDWARE,
.attrConfig = PERF_COUNT_HW_STALLED_CYCLES_FRONTEND},
{.type = VIR_PERF_EVENT_STALLED_CYCLES_BACKEND,
.attrType = PERF_TYPE_HARDWARE,
.attrConfig = PERF_COUNT_HW_STALLED_CYCLES_BACKEND},
};
typedef struct virPerfEventAttr *virPerfEventAttrPtr;

3
src/util/virperf.h
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@ -43,6 +43,9 @@ typedef enum {
VIR_PERF_EVENT_STALLED_CYCLES_FRONTEND, /* Count of stalled cpu cycles in
the frontend of the instruction
processor pipeline */
VIR_PERF_EVENT_STALLED_CYCLES_BACKEND, /* Count of stalled cpu cycles in
the backend of the instruction
processor pipeline */
VIR_PERF_EVENT_LAST
} virPerfEventType;

1
tests/genericxml2xmlindata/generic-perf.xml
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@ -24,6 +24,7 @@
<event name='branch_misses' enabled='yes'/>
<event name='bus_cycles' enabled='yes'/>
<event name='stalled_cycles_frontend' enabled='yes'/>
<event name='stalled_cycles_backend' enabled='yes'/>
</perf>
<devices>
</devices>

7
tools/virsh.pod
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@ -949,7 +949,8 @@ I<--perf> returns the statistics of all enabled perf events:
"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.stalled_cycles_frontend" - the count of stalled frontend cpu cycles
"perf.stalled_cycles_frontend" - the count of stalled frontend cpu cycles,
"perf.stalled_cycles_backend" - the count of stalled backend cpu cycles
See the B<perf> command for more details about each event.
@ -2307,6 +2308,10 @@ B<Valid perf event names>
cycles in the frontend of the
instruction processor pipeline by
applications running on the platform.
stalled_cycles_backend - Provides the count of stalled cpu
cycles in the backend 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.