Changeset 77382 in vbox

Timestamp:

Feb 20, 2019 1:44:22 PM (6 years ago)

Author:

vboxsync

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

128933

Message:

VMM: Further improvments on the IEM timer polling by making it fully configurable. Sideeffect is that EMSTATE_IEM_THEN_REM has now become more accurate and will execute fewer instructions (exactly 1024 rather than up to 1023+4096) before switching to REM. [burn fix?]

File:

• trunk/src/VBox/VMM/VMMAll/IEMAll.cpp (modified) (2 diffs)

trunk/src/VBox/VMM/VMMAll/IEMAll.cpp

@@ -14401 +14401 @@
              * The run loop.  We limit ourselves to 4096 instructions right now.
              */
+            uint32_t cMaxInstructionsGccStupidity = cMaxInstructions;
             PVM pVM = pVCpu->CTX_SUFF(pVM);
             for (;;)
@@ -14441 +14442 @@
                                       && !VM_FF_IS_ANY_SET(pVM, VM_FF_ALL_MASK) ))
                         {
-                            if (cMaxInstructions-- > 0)
+                            if (cMaxInstructionsGccStupidity-- > 0)
                             {
                                 /* Poll timers every now an then according to the caller's specs. */
-                                if (   (cMaxInstructions & cPollRate) != 0
+                                if (   (cMaxInstructionsGccStupidity & cPollRate) != 0
                                     || !TMTimerPollBool(pVM, pVCpu))
                                 {