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make/autoconf/flags-cflags.m4
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rev 54643 : 8220388: Increase -inlinehint-threshold for Clang to avoid G1 pause time regression
Summary: Make Clang inline more aggressively for functions with inline keyword
Reviewed-by:
@@ -534,10 +534,16 @@
# src/hotspot/cpu/*/globalDefinitions_*.hpp files, but this value currently
# works for all platforms.
TOOLCHAIN_CFLAGS_JVM="$TOOLCHAIN_CFLAGS_JVM -mno-omit-leaf-frame-pointer -mstack-alignment=16"
if test "x$OPENJDK_TARGET_OS" = xlinux; then
+ if test "x$DEBUG_LEVEL" = xrelease; then
+ # Clang does not inline as much as GCC does for functions with "inline" keyword by default.
+ # This causes noticeable slowdown in pause time for G1, and possibly in other areas.
+ # Increasing the inline hint threshold avoids the slowdown for Clang-built JVM.
+ TOOLCHAIN_CFLAGS_JVM="$TOOLCHAIN_CFLAGS_JVM -mllvm -inlinehint-threshold=100000"
+ fi
TOOLCHAIN_CFLAGS_JDK="-pipe"
TOOLCHAIN_CFLAGS_JDK_CONLY="-fno-strict-aliasing" # technically NOT for CXX
fi
elif test "x$TOOLCHAIN_TYPE" = xsolstudio; then
TOOLCHAIN_FLAGS="-errtags -errfmt"
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