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perf: add branch_misses perf event support

Browse Source 
This patch adds support and documentation
for the branch_misses perf event.

Signed-off-by: Nitesh Konkar <nitkon12@linux.vnet.ibm.com>
This commit is contained in:
Nitesh Konkar 2016-12-11 19:00:11 +05:30 committed by John Ferlan
parent cdd6819318
commit 8981d7925e
10 changed files with 32 additions and 4 deletions
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6
docs/formatdomain.html.in
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@ -1928,6 +1928,7 @@
&lt;event name='cache_references' enabled='no'/&gt;
&lt;event name='cache_misses' enabled='no'/&gt;
&lt;event name='branch_instructions' enabled='no'/&gt;
&lt;event name='branch_misses' enabled='no'/&gt;
&lt;/perf&gt;
...
</pre>
@ -1978,6 +1979,11 @@
<td>the count of branch instructions by applications running on the platform</td>
<td><code>perf.branch_instructions</code></td>
</tr>
<tr>
<td><code>branch_misses</code></td>
<td>the count of branch misses by applications running on the platform</td>
<td><code>perf.branch_misses</code></td>
</tr>
</table>
<h3><a name="elementsDevices">Devices</a></h3>

4
docs/news.html.in
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@ -29,9 +29,9 @@
</li>
<li><strong>Improvements</strong>
<ul>
<li>perf: Add perf.branch_instructions<br/>
<li>perf: Add more perf statistics<br/>
Add support to get the count of branch instructions executed
by applications running on the platform
and branch misses by applications running on the platform
</li>
</ul>
</li>

1
docs/schemas/domaincommon.rng
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@ -428,6 +428,7 @@
<value>cache_references</value>
<value>cache_misses</value>
<value>branch_instructions</value>
<value>branch_misses</value>
</choice>
</attribute>
<attribute name="enabled">

10
include/libvirt/libvirt-domain.h
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@ -2135,6 +2135,16 @@ void virDomainStatsRecordListFree(virDomainStatsRecordPtr *stats);
*/
# define VIR_PERF_PARAM_BRANCH_INSTRUCTIONS "branch_instructions"
/**
* VIR_PERF_PARAM_BRANCH_MISSES:
*
* Macro for typed parameter name that represents branch_misses
* perf event which can be used to measure the count of branch misses
* by applications running on the platform. It corresponds to the
* "perf.branch_misses" field in the *Stats APIs.
*/
# define VIR_PERF_PARAM_BRANCH_MISSES "branch_misses"
int virDomainGetPerfEvents(virDomainPtr dom,
virTypedParameterPtr *params,
int *nparams,

2
src/libvirt-domain.c
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@ -11232,6 +11232,8 @@ virConnectGetDomainCapabilities(virConnectPtr conn,
* "perf.branch_instructions" - The count of branch instructions as
* unsigned long long. It is produced by
* branch_instructions perf event.
* "perf.branch_misses" - The count of branch misses as unsigned long
* long. It is produced by branch_misses 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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@ -9853,6 +9853,7 @@ qemuDomainSetPerfEvents(virDomainPtr dom,
VIR_PERF_PARAM_CACHE_REFERENCES, VIR_TYPED_PARAM_BOOLEAN,
VIR_PERF_PARAM_CACHE_MISSES, VIR_TYPED_PARAM_BOOLEAN,
VIR_PERF_PARAM_BRANCH_INSTRUCTIONS, VIR_TYPED_PARAM_BOOLEAN,
VIR_PERF_PARAM_BRANCH_MISSES, VIR_TYPED_PARAM_BOOLEAN,
NULL) < 0)
return -1;

5
src/util/virperf.c
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@ -41,7 +41,7 @@ VIR_ENUM_IMPL(virPerfEvent, VIR_PERF_EVENT_LAST,
"cmt", "mbmt", "mbml",
"cpu_cycles", "instructions",
"cache_references", "cache_misses",
"branch_instructions");
"branch_instructions", "branch_misses");
struct virPerfEvent {
int type;
@ -89,6 +89,9 @@ static struct virPerfEventAttr attrs[] = {
{.type = VIR_PERF_EVENT_BRANCH_INSTRUCTIONS,
.attrType = PERF_TYPE_HARDWARE,
.attrConfig = PERF_COUNT_HW_BRANCH_INSTRUCTIONS},
{.type = VIR_PERF_EVENT_BRANCH_MISSES,
.attrType = PERF_TYPE_HARDWARE,
.attrConfig = PERF_COUNT_HW_BRANCH_MISSES},
};
typedef struct virPerfEventAttr *virPerfEventAttrPtr;

1
src/util/virperf.h
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@ -38,6 +38,7 @@ typedef enum {
VIR_PERF_EVENT_CACHE_MISSES, /* Cache misses by applications */
VIR_PERF_EVENT_BRANCH_INSTRUCTIONS, /* Count of branch instructions
for applications */
VIR_PERF_EVENT_BRANCH_MISSES, /* Count of branch misses for applications */
VIR_PERF_EVENT_LAST
} virPerfEventType;

1
tests/genericxml2xmlindata/generic-perf.xml
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@ -21,6 +21,7 @@
<event name='cache_references' enabled='no'/>
<event name='cache_misses' enabled='no'/>
<event name='branch_instructions' enabled='yes'/>
<event name='branch_misses' enabled='yes'/>
</perf>
<devices>
</devices>

5
tools/virsh.pod
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@ -946,7 +946,8 @@ I<--perf> returns the statistics of all enabled perf events:
"perf.instructions" - the count of instructions,
"perf.cache_references" - the count of cache hits,
"perf.cache_misses" - the count of caches misses,
"perf.branch_instructions" - the count of application branch instructions
"perf.branch_instructions" - the count of branch instructions,
"perf.branch_misses" - the count of branch misses
See the B<perf> command for more details about each event.
@ -2296,6 +2297,8 @@ B<Valid perf event names>
branch_instructions - Provides the count of branch instructions
executed by applications running on the
platform.
branch_misses - Provides the count of branch misses executed
by applications running on the platform.
B<Note>: The statistics can be retrieved using the B<domstats> command using
the I<--perf> flag.