Changeset 86018 in vbox for trunk/src/VBox/VMM/VMMR3

Timestamp:

Sep 3, 2020 9:13:51 AM (5 years ago)

Author:

vboxsync

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

140215

Message:

NEM/Hyper-V: Make the unmap pages hack threshold configurable bugref:9044

File:

• trunk/src/VBox/VMM/VMMR3/NEMR3.cpp (modified) (2 diffs)

trunk/src/VBox/VMM/VMMR3/NEMR3.cpp

@@ -85 +85 @@
 #ifdef RT_OS_WINDOWS
                                   "|UseRing0Runloop"
+                                  "|MaxPagesMappedBeforeUnmap"
 #endif
                                   ,
@@ -121 +122 @@
     AssertLogRelRCReturn(rc, rc);
     pVM->nem.s.fUseRing0Runloop = fUseRing0Runloop;
+
+    /** @cfgm{/NEM/MaxPagesMappedBeforeUnmap, bool, true}
+     * Maximum nuber of pages mapped before into the Hv partition before
+     * unmapping verything and starting from the beginning
+     * @bugref{9044}. */
+    uint32_t cMappedPagesMaxBeforeUnmap = 0;
+    rc = CFGMR3QueryU32Def(pCfgNem, "MaxPagesMappedBeforeUnmap", &cMappedPagesMaxBeforeUnmap, 0);
+    AssertLogRelRCReturn(rc, rc);
+
+    if (   cMappedPagesMaxBeforeUnmap < 4000
+        && cMappedPagesMaxBeforeUnmap != 0)
+    {
+        LogRel(("NEM: MaxPagesMappedBeforeUnmap too small %u, setting to 4000\n", cMappedPagesMaxBeforeUnmap));
+        cMappedPagesMaxBeforeUnmap = 4000;
+    }
+
+    LogRel(("NEM: cMappedPagesMaxBeforeUnmap=%u\n", cMappedPagesMaxBeforeUnmap));
+    pVM->nem.s.cMappedPagesMaxBeforeUnmap = cMappedPagesMaxBeforeUnmap;
 #endif