After trimming, set the footprint to the number of pages in use.

A trim can decrease the an mspace footprint but it will not decrease
its max footprint.  We need to decrease the max footprint to make any
pages recovered by a trim available to external allocations.

By setting the ideal footprint after a trim we lift any soft limit in
effect and make the mspace footprint and max footprints equal.

Change-Id: Ia6eb99634ce1d732b417a90291b110d1fc46c2e3

diff --git a/vm/alloc/HeapSource.c b/vm/alloc/HeapSource.c
index 25e0125..46b1c78 100644 (file)
--- a/vm/alloc/HeapSource.c
+++ b/vm/alloc/HeapSource.c
@@ -1685,6 +1685,7 @@ static bool externalAllocPossible(const HeapSource *hs, size_t n)
      * Try trimming the mspace to reclaim unused pages.
      */
     dvmHeapSourceTrim(bytesTrimmed, NELEM(bytesTrimmed));
+    snapIdealFootprint();
     if (externalBytesAvailable(hs, n)) {
         return true;
     }