[libvirt] [PATCH v7 7/7] qemu-probes: add probes for cache MemoryStats cache

[Derbyshev Dmitriy]

From: Igor Redko <redkoi at virtuozzo.com>

Signed-off-by: Igor Redko <redkoi at virtuozzo.com>
Signed-off-by: Derbyshev Dmitry <dderbyshev at virtuozzo.com>
---
 src/libvirt_qemu_probes.d | 4 ++++
 src/qemu/qemu_driver.c    | 7 +++++++
 2 files changed, 11 insertions(+)

diff --git a/src/libvirt_qemu_probes.d b/src/libvirt_qemu_probes.d
index e4449a9..1a36026 100644
--- a/src/libvirt_qemu_probes.d
+++ b/src/libvirt_qemu_probes.d
@@ -19,4 +19,8 @@ provider libvirt {
         probe qemu_monitor_io_read(void *mon, const char *buf, unsigned int len, int ret, int errno);
         probe qemu_monitor_io_write(void *mon, const char *buf, unsigned int len, int ret, int errno);
         probe qemu_monitor_io_send_fd(void *mon, int fd, int ret, int errno);
+
+        # Memory statistics caching
+        probe qemu_memstats_cache_expires(unsigned long long old_expire, unsigned long long new_expire);
+        probe qemu_memstats_cache_expired(unsigned long long expire, unsigned long long now);
 };
diff --git a/src/qemu/qemu_driver.c b/src/qemu/qemu_driver.c
index 616b87d..d14009e 100644
--- a/src/qemu/qemu_driver.c
+++ b/src/qemu/qemu_driver.c
@@ -105,6 +105,11 @@
 #include "virnuma.h"
 #include "dirname.h"
 #include "network/bridge_driver.h"
+#include "virprobe.h"
+
+#ifdef WITH_DTRACE_PROBES
+# include "libvirt_qemu_probes.h"
+#endif
 
 #define VIR_FROM_THIS VIR_FROM_QEMU
 
@@ -11000,6 +11005,7 @@ qemuDomainCacheMemoryStats(virDomainObjPtr vm,
     /* period also in secs */
     expires = (timestamp > now) ? now : timestamp + def->memballoon->period * 1000;
 
+    PROBE(QEMU_MEMSTATS_CACHE_EXPIRES, "old=%llu new=%llu", priv->cacheExpires, expires);
     if (expires < now || expires <= priv->cacheExpires)
         goto cleanup;
 
@@ -11032,6 +11038,7 @@ qemuDomainCachedMemoryStats(virDomainObjPtr vm,
         goto cleanup;
 
     if (now > priv->cacheExpires){
+        PROBE(QEMU_MEMSTATS_CACHE_EXPIRED, "old=%llu new=%llu", priv->cacheExpires, now);
         goto cleanup;
     }
 
-- 
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