[libvirt] [PATCH v2 1/2] perf: add one more perf event support
John Ferlan
jferlan at redhat.com
Wed Dec 7 11:33:45 UTC 2016
On 12/07/2016 05:57 AM, Nitesh Konkar wrote:
> With current perf framework, this patch adds support and documentation
> for branch instructions perf event.
>
> Signed-off-by: Nitesh Konkar <nitkon12 at linux.vnet.ibm.com>
> ---
> docs/formatdomain.html.in | 6 ++++++
> 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 | 6 +++++-
> src/util/virperf.h | 2 ++
> tests/genericxml2xmlindata/generic-perf.xml | 1 +
> tools/virsh.pod | 3 +++
> 9 files changed, 32 insertions(+), 1 deletion(-)
>
> diff --git a/docs/formatdomain.html.in b/docs/formatdomain.html.in
> index 6bd02cc..ee8d312 100644
> --- a/docs/formatdomain.html.in
> +++ b/docs/formatdomain.html.in
> @@ -1927,6 +1927,7 @@
> <event name='instructions' enabled='yes'/>
> <event name='cache_references' enabled='no'/>
> <event name='cache_misses' enabled='no'/>
> + <event name='branch_instructions' enabled='no'/>
> </perf>
> ...
> </pre>
> @@ -1972,6 +1973,11 @@
> <td>the count of cache misses by applications running on the platform</td>
> <td><code>perf.cache_misses</code></td>
> </tr>
> + <tr>
> + <td><code>branch_instructions</code></td>
> + <td>the count of branch instructions by applications running on the platform</td>
> + <td><code>perf.branch_instructions</code></td>
> + </tr>
> </table>
>
> <h3><a name="elementsDevices">Devices</a></h3>
> diff --git a/docs/schemas/domaincommon.rng b/docs/schemas/domaincommon.rng
> index bb903ef..5fdc036 100644
> --- a/docs/schemas/domaincommon.rng
> +++ b/docs/schemas/domaincommon.rng
> @@ -427,6 +427,7 @@
> <value>instructions</value>
> <value>cache_references</value>
> <value>cache_misses</value>
> + <value>branch_instructions</value>
> </choice>
> </attribute>
> <attribute name="enabled">
> diff --git a/include/libvirt/libvirt-domain.h b/include/libvirt/libvirt-domain.h
> index a8435ab..aad2541 100644
> --- a/include/libvirt/libvirt-domain.h
> +++ b/include/libvirt/libvirt-domain.h
> @@ -2125,6 +2125,16 @@ void virDomainStatsRecordListFree(virDomainStatsRecordPtr *stats);
> */
> # define VIR_PERF_PARAM_CPU_CYCLES "cpu_cycles"
>
> +/**
> + * VIR_PERF_PARAM_BRANCH_INSTRUCTIONS:
> + *
> + * Macro for typed parameter name that represents branch instructions
s/branch instructions/branch_instructions
> + * perf event which can be used to measure the count of branch instructions
> + * by applications running on the platform. It corresponds to the
> + * "perf.branch_instructions" field in the *Stats APIs.
> + */
> +# define VIR_PERF_PARAM_BRANCH_INSTRUCTIONS "branch_instructions"
> +
> int virDomainGetPerfEvents(virDomainPtr dom,
> virTypedParameterPtr *params,
> int *nparams,
> diff --git a/src/libvirt-domain.c b/src/libvirt-domain.c
> index ce199f0..fa28217 100644
> --- a/src/libvirt-domain.c
> +++ b/src/libvirt-domain.c
> @@ -11213,6 +11213,9 @@ virConnectGetDomainCapabilities(virConnectPtr conn,
> * "perf.cpu_cycles" - The count of cpu cycles (total/elapsed) as an
> * unsigned long long. It is produced by cpu_cycles
> * perf event.
> + * "perf.branch_instructions" - The count of branch instructions as unsigned
> + * long long. It is produced by branch_instructions
> + * perf event.
I had to merge this with a recent change I made and pushed (commit id
'585ad00b5b').
> *
> * 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 3517aa2..c7fad30 100644
> --- a/src/qemu/qemu_driver.c
> +++ b/src/qemu/qemu_driver.c
> @@ -9852,6 +9852,7 @@ qemuDomainSetPerfEvents(virDomainPtr dom,
> VIR_PERF_PARAM_INSTRUCTIONS, VIR_TYPED_PARAM_BOOLEAN,
> 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,
> NULL) < 0)
> return -1;
>
> diff --git a/src/util/virperf.c b/src/util/virperf.c
> index 5d57962..635faf1 100644
> --- a/src/util/virperf.c
> +++ b/src/util/virperf.c
> @@ -40,7 +40,8 @@ VIR_LOG_INIT("util.perf");
> VIR_ENUM_IMPL(virPerfEvent, VIR_PERF_EVENT_LAST,
> "cmt", "mbmt", "mbml",
> "cpu_cycles", "instructions",
> - "cache_references", "cache_misses");
> + "cache_references", "cache_misses",
> + "branch_instructions");
>
> struct virPerfEvent {
> int type;
> @@ -85,6 +86,9 @@ static struct virPerfEventAttr attrs[] = {
> {.type = VIR_PERF_EVENT_CACHE_MISSES,
> .attrType = PERF_TYPE_HARDWARE,
> .attrConfig = PERF_COUNT_HW_CACHE_MISSES},
> + {.type = VIR_PERF_EVENT_BRANCH_INSTRUCTIONS,
> + .attrType = PERF_TYPE_HARDWARE,
> + .attrConfig = PERF_COUNT_HW_BRANCH_INSTRUCTIONS},
> };
> typedef struct virPerfEventAttr *virPerfEventAttrPtr;
>
> diff --git a/src/util/virperf.h b/src/util/virperf.h
> index 3fca2d0..8ebc03c 100644
> --- a/src/util/virperf.h
> +++ b/src/util/virperf.h
> @@ -36,6 +36,8 @@ typedef enum {
> VIR_PERF_EVENT_INSTRUCTIONS, /* Count of instructions for application */
> VIR_PERF_EVENT_CACHE_REFERENCES, /* Cache hits by applications */
> VIR_PERF_EVENT_CACHE_MISSES, /* Cache misses by applications */
> + VIR_PERF_EVENT_BRANCH_INSTRUCTIONS, /* Count of branch instructions
> + for applications */
>
> VIR_PERF_EVENT_LAST
> } virPerfEventType;
> diff --git a/tests/genericxml2xmlindata/generic-perf.xml b/tests/genericxml2xmlindata/generic-perf.xml
> index a914133..92e5847 100644
> --- a/tests/genericxml2xmlindata/generic-perf.xml
> +++ b/tests/genericxml2xmlindata/generic-perf.xml
> @@ -20,6 +20,7 @@
> <event name='instructions' enabled='yes'/>
> <event name='cache_references' enabled='no'/>
> <event name='cache_misses' enabled='no'/>
> + <event name='branch_instructions' enabled='yes'/>
> </perf>
> <devices>
> </devices>
> diff --git a/tools/virsh.pod b/tools/virsh.pod
> index 247d235..493465d 100644
> --- a/tools/virsh.pod
> +++ b/tools/virsh.pod
You missed one spot a bit earlier, I've squashed in:
-"perf.cache_misses" - the count of caches misses
+"perf.cache_misses" - the count of caches misses,
+"perf.branch_instructions" - the count of application branch instructions
> @@ -2289,6 +2289,9 @@ B<Valid perf event names>
> (total/elapsed). May be used with
> instructions in order to get a cycles
> per instruction.
> + branch_instructions - Provides the count of branch instructions
> + executed by applications running on the
> + platform.
>
> B<Note>: The statistics can be retrieved using the B<domstats> command using
> the I<--perf> flag.
>
ACK - will push shortly
John
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