[libvirt] [RFC][PATCHv1 1/5] libvirt - show cpuacct cgroup's percpu statistics.

[KAMEZAWA Hiroyuki]

cpuacct cgroup provides per cpu cputime. Add an interface
for that.

Signed-off-by: KAMEZAWA Hiroyuki <kamezawa.hiroyu at jp.fujitsu.com>
---
 src/libvirt_private.syms |    1 +
 src/util/cgroup.c        |   27 +++++++++++++++++++++++++++
 src/util/cgroup.h        |    2 ++
 3 files changed, 30 insertions(+), 0 deletions(-)

diff --git a/src/libvirt_private.syms b/src/libvirt_private.syms
index ba7739d..f7a1ee7 100644
--- a/src/libvirt_private.syms
+++ b/src/libvirt_private.syms
@@ -70,6 +70,7 @@ virCgroupFree;
 virCgroupGetBlkioWeight;
 virCgroupGetCpuShares;
 virCgroupGetCpuacctUsage;
+virCgroupGetCpuacctUsagePercpu;
 virCgroupGetFreezerState;
 virCgroupGetMemoryHardLimit;
 virCgroupGetMemorySoftLimit;
diff --git a/src/util/cgroup.c b/src/util/cgroup.c
index afe8731..58ea805 100644
--- a/src/util/cgroup.c
+++ b/src/util/cgroup.c
@@ -1329,6 +1329,33 @@ int virCgroupGetCpuacctUsage(virCgroupPtr group, unsigned long long *usage)
                                 "cpuacct.usage", usage);
 }
 
+int virCgroupGetCpuacctUsagePercpu(virCgroupPtr group,
+                                 int nr, unsigned long long *usage)
+{
+    int i, rc;
+    char *strval = NULL;
+    char *startp, *endp;
+    unsigned long long int value;
+
+    memset(usage, 0, sizeof(unsigned long long) * nr);
+
+    rc = virCgroupGetValueStr(group, VIR_CGROUP_CONTROLLER_CPUACCT,
+                              "cpuacct.usage_percpu", &strval);
+    if (rc)
+        goto out;
+
+    for (i = 0, startp = strval; i < nr; i++) {
+        if (virStrToLong_ull(startp, &endp, 10, &value))
+            break;
+        startp = endp;
+        usage[i] = value;
+    }
+    rc = i;
+out:
+    VIR_FREE(strval);
+    return rc;
+}
+
 int virCgroupSetFreezerState(virCgroupPtr group, const char *state)
 {
     return virCgroupSetValueStr(group,
diff --git a/src/util/cgroup.h b/src/util/cgroup.h
index 8ae756d..31cbcba 100644
--- a/src/util/cgroup.h
+++ b/src/util/cgroup.h
@@ -100,6 +100,8 @@ int virCgroupSetCpuShares(virCgroupPtr group, unsigned long long shares);
 int virCgroupGetCpuShares(virCgroupPtr group, unsigned long long *shares);
 
 int virCgroupGetCpuacctUsage(virCgroupPtr group, unsigned long long *usage);
+int virCgroupGetCpuacctUsagePercpu(virCgroupPtr group,
+                                   int nr, unsigned long long *usage);
 
 int virCgroupSetFreezerState(virCgroupPtr group, const char *state);
 int virCgroupGetFreezerState(virCgroupPtr group, char **state);
-- 
1.7.4.1