Changeset 2885 in vbox for trunk/src

Timestamp:

May 25, 2007 5:07:12 PM (18 years ago)

Author:

vboxsync

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

21544

Message:

Read the previous value together with the GIP.

File:

• trunk/src/VBox/VMM/VMMAll/TMAllVirtual.cpp (modified) (4 diffs)

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

@@ -61 +61 @@
     uint64_t    u64NanoTS;
     uint32_t    u32UpdateIntervalTSC;
+    uint64_t    u64PrevNanoTS;
 
     /*
-     * Read the GIP data.
+     * Read the GIP data and the previous value.
      */
     for (;;)
@@ -85 +86 @@
             u32NanoTSFactor0 = pGip->u32UpdateIntervalNS;
             u64Delta = ASMReadTSC();
+            u64PrevNanoTS = ASMAtomicReadU64(&pVM->tm.s.u64VirtualRawPrev);
             if (RT_UNLIKELY(    pGip->aCPUs[0].u32TransactionId != u32TransactionId
                             ||  (u32TransactionId & 1)))
@@ -112 +114 @@
             u32NanoTSFactor0 = pGip->u32UpdateIntervalNS;
             u64Delta = ASMReadTSC();
+            u64PrevNanoTS = ASMAtomicReadU64(&pVM->tm.s.u64VirtualRawPrev);
             if (RT_UNLIKELY(u8ApicId != ASMGetApicId()))
                 continue;
@@ -157 +160 @@
      */
     u64NanoTS += u64Delta;
-    uint64_t u64PrevNanoTS = ASMAtomicReadU64(&pVM->tm.s.u64VirtualRawPrev);
     uint64_t u64DeltaPrev = u64NanoTS - u64PrevNanoTS;
     if (RT_LIKELY(u64DeltaPrev < 1000000000 /* 1s */))