# HG changeset patch
# User johnc
# Date 1295470871 28800
# Node ID 182e9624aa423ec064a7e08adb40c23c816c35b6
# Parent  ffd725ff6943ccacb262179058e5261d7296b3db
7012642: G1: JumbleGC002 test aborts with segmentation violation due to uncaught stack overflow
Summary: With recent G1 allocation path changes, the value of StackShadowPages in fast debug builds of the JVM, is no longer large enough to prevent the JVM C++ code from touching the stack guard pages. Increase the value of StackShadowPages to a suitable value.
Reviewed-by: ysr, tonyp, coleenp

diff -r ffd725ff6943 -r 182e9624aa42 src/cpu/x86/vm/globals_x86.hpp
--- a/src/cpu/x86/vm/globals_x86.hpp	Thu Jan 13 17:19:21 2011 -0800
+++ b/src/cpu/x86/vm/globals_x86.hpp	Wed Jan 19 13:01:11 2011 -0800
@@ -62,7 +62,7 @@
 // due to lack of optimization caused by C++ compiler bugs
 define_pd_global(intx, StackShadowPages, SOLARIS_ONLY(20) NOT_SOLARIS(6) DEBUG_ONLY(+2));
 #else
-define_pd_global(intx, StackShadowPages, 3 DEBUG_ONLY(+1));
+define_pd_global(intx, StackShadowPages, 3 DEBUG_ONLY(+5));
 #endif // AMD64
 
 define_pd_global(intx, PreInflateSpin,           10);