commit 5300b53e78efdeed642b8b8ef1cabc923ee54c06
author Jianzhou Zhao <jianzhouzh@google.com> Fri Feb 12 03:15:09 2021 +0000
committer Copybara-Service <copybara-worker@google.com> Fri Feb 19 00:59:11 2021 -0800
tree 1e01ecd11670248d1874c9de81e04acdda3844c5
parent 10faa0a5732f0fb2519a9ce077b499b2255314d5

[dfsan] Turn off THP at dfsan_flush

https://reviews.llvm.org/D89662 turned this off at dfsan_init.
dfsan_flush also needs to turn it off.
W/o this a program may get more and more memory usage after hours.

Reviewed-by: morehouse

Differential Revision: https://reviews.llvm.org/D96569

GitOrigin-RevId: 7590c0078dd53d9ad508725fc27d96705ac3a206

lib/dfsan/dfsan.cpp

diff --git a/lib/dfsan/dfsan.cpp b/lib/dfsan/dfsan.cpp
index 43a5fe9..7abdf68 100644
--- a/lib/dfsan/dfsan.cpp
+++ b/lib/dfsan/dfsan.cpp
@@ -551,7 +551,7 @@
 }
 
 extern "C" void dfsan_flush() {
-  if (!MmapFixedNoReserve(ShadowAddr(), UnusedAddr() - ShadowAddr()))
+  if (!MmapFixedSuperNoReserve(ShadowAddr(), UnusedAddr() - ShadowAddr()))
     Die();
 }
 
@@ -560,8 +560,7 @@
 
   ::InitializePlatformEarly();
 
-  if (!MmapFixedSuperNoReserve(ShadowAddr(), UnusedAddr() - ShadowAddr()))
-    Die();
+  dfsan_flush();
   if (common_flags()->use_madv_dontdump)
     DontDumpShadowMemory(ShadowAddr(), UnusedAddr() - ShadowAddr());