1 files changed, 25 insertions, 2 deletions
diff --git a/compiler-rt/lib/profile/InstrProfilingUtil.c b/compiler-rt/lib/profile/InstrProfilingUtil.c
index bf5a9670fe18..4fa792b72eac 100644
--- a/compiler-rt/lib/profile/InstrProfilingUtil.c
+++ b/compiler-rt/lib/profile/InstrProfilingUtil.c
@@ -12,12 +12,13 @@
 #include <windows.h>
 #include "WindowsMMap.h"
 #else
+#include <errno.h>
+#include <fcntl.h>
 #include <sys/file.h>
+#include <sys/mman.h>
 #include <sys/stat.h>
 #include <sys/types.h>
 #include <unistd.h>
-#include <fcntl.h>
-#include <errno.h>
 #endif
 
 #ifdef COMPILER_RT_HAS_UNAME
@@ -32,6 +33,10 @@
 #include <sys/prctl.h>
 #endif
 
+#if defined(__Fuchsia__)
+#include <zircon/syscalls.h>
+#endif
+
 #include "InstrProfiling.h"
 #include "InstrProfilingUtil.h"
 
@@ -330,3 +335,21 @@ COMPILER_RT_VISIBILITY void lprofRestoreSigKill() {
   prctl(PR_SET_PDEATHSIG, SIGKILL);
 #endif
 }
+
+COMPILER_RT_VISIBILITY int lprofReleaseMemoryPagesToOS(uintptr_t Begin,
+                                                       uintptr_t End) {
+  size_t PageSize = getpagesize();
+  uintptr_t BeginAligned = lprofRoundUpTo((uintptr_t)Begin, PageSize);
+  uintptr_t EndAligned = lprofRoundDownTo((uintptr_t)End, PageSize);
+  if (BeginAligned < EndAligned) {
+#if defined(__Fuchsia__)
+    return _zx_vmar_op_range(_zx_vmar_root_self(), ZX_VMAR_OP_DECOMMIT,
+                             (zx_vaddr_t)BeginAligned,
+                             EndAligned - BeginAligned, NULL, 0);
+#else
+    return madvise((void *)BeginAligned, EndAligned - BeginAligned,
+                   MADV_DONTNEED);
+#endif
+  }
+  return 0;
+}