Changeset 87633 in vbox for trunk/src/VBox/VMM/VMMR3

Timestamp:

Feb 5, 2021 9:37:09 PM (4 years ago)

Author:

vboxsync

svn:sync-xref-src-repo-rev:

142669

Message:

VMM/TM,VMM/HMVMX: Try avoid calling TMCpuTickGetDeadlineAndTscOffset as it is expensive. Current approach is a bit erratic wrt CPUID benchmark results, but it's generally better than before.

File:

• trunk/src/VBox/VMM/VMMR3/HM.cpp (modified) (3 diffs)

trunk/src/VBox/VMM/VMMR3/HM.cpp

@@ -704 +704 @@
 #endif
 
-#ifdef VBOX_WITH_STATISTICS
     bool const fCpuSupportsVmx = ASMIsIntelCpu() || ASMIsViaCentaurCpu() || ASMIsShanghaiCpu();
-#endif
     for (VMCPUID idCpu = 0; idCpu < pVM->cCpus; idCpu++)
     {
@@ -792 +790 @@
         HM_REG_COUNTER(&pHmCpu->StatExitHostNmiInGC,        "/HM/CPU%u/Exit/HostNmiInGC", "Host NMI received while in guest context.");
         HM_REG_COUNTER(&pHmCpu->StatExitHostNmiInGCIpi,     "/HM/CPU%u/Exit/HostNmiInGCIpi", "Host NMI received while in guest context dispatched using IPIs.");
+        HM_REG_COUNTER(&pHmCpu->StatExitPreemptTimer,       "/HM/CPU%u/Exit/PreemptTimer", "VMX-preemption timer expired.");
 #ifdef VBOX_WITH_STATISTICS
-        HM_REG_COUNTER(&pHmCpu->StatExitPreemptTimer,       "/HM/CPU%u/Exit/PreemptTimer", "VMX-preemption timer expired.");
         HM_REG_COUNTER(&pHmCpu->StatExitTprBelowThreshold,  "/HM/CPU%u/Exit/TprBelowThreshold", "TPR lowered below threshold by the guest.");
         HM_REG_COUNTER(&pHmCpu->StatExitTaskSwitch,         "/HM/CPU%u/Exit/TaskSwitch", "Task switch caused through task gate in IDT.");
@@ -871 +869 @@
         HM_REG_COUNTER(&pHmCpu->StatVmxCheckBadRpl,         "/HM/CPU%u/VMXCheck/RPL", "Could not use VMX due to unsuitable RPL.");
         HM_REG_COUNTER(&pHmCpu->StatVmxCheckPmOk,           "/HM/CPU%u/VMXCheck/VMX_PM", "VMX execution in protected mode OK.");
-
+#endif
+        if (fCpuSupportsVmx)
+        {
+            HM_REG_COUNTER(&pHmCpu->StatExitPreemptTimer,                      "/HM/CPU%u/PreemptTimer",                          "VMX-preemption timer fired.");
+            HM_REG_COUNTER(&pHmCpu->StatVmxPreemptionReusingDeadline,          "/HM/CPU%u/PreemptTimer/ReusingDeadline",          "VMX-preemption timer arming logic using previously calculated deadline");
+            HM_REG_COUNTER(&pHmCpu->StatVmxPreemptionReusingDeadlineExpired,   "/HM/CPU%u/PreemptTimer/ReusingDeadlineExpired",   "VMX-preemption timer arming logic found previous deadline already expired (ignored)");
+            HM_REG_COUNTER(&pHmCpu->StatVmxPreemptionRecalcingDeadline,        "/HM/CPU%u/PreemptTimer/RecalcingDeadline",        "VMX-preemption timer arming logic recalculating the deadline (slighly expensive)");
+            HM_REG_COUNTER(&pHmCpu->StatVmxPreemptionRecalcingDeadlineExpired, "/HM/CPU%u/PreemptTimer/RecalcingDeadlineExpired", "VMX-preemption timer arming logic found recalculated deadline expired (ignored)");
+        }
+#ifdef VBOX_WITH_STATISTICS
         /*
          * Guest Exit reason stats.