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Work around OpenJDK's os::workaround_expand_exec_shield_cs_limit

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Change-Id: Iea1b6354764db0a22976b3de49bf3e22ccb7243e
This commit is contained in:
Stephan Bergmann
2014-10-27 18:26:33 +01:00
parent 4aa2791ea6
commit f66cbdb948
1 changed files with 40 additions and 0 deletions
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40
jvmfwk/plugins/sunmajor/pluginlib/sunjavaplugin.cxx
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@@ -70,6 +70,10 @@
#endif
#endif
#if defined LINUX && defined X86
#include <sys/resource.h>
#endif
using namespace osl;
using namespace std;
using namespace jfw_plugin;
@@ -676,6 +680,7 @@ javaPluginError jfw_plugin_startJavaVirtualMachine(
// all some directories of the Java installation. This is necessary for
// all versions below 1.5.1
options.push_back(Option("abort", reinterpret_cast<void*>(abort_handler)));
bool hasStackSize = false;
for (int i = 0; i < cOptions; i++)
{
OString opt(arOptions[i].optionString);
@@ -692,11 +697,46 @@ javaPluginError jfw_plugin_startJavaVirtualMachine(
if (opt == "-Xint") {
addForceInterpreted = false;
}
if (opt.startsWith("-Xss")) {
hasStackSize = true;
}
options.push_back(Option(opt, arOptions[i].extraInfo));
}
if (addForceInterpreted) {
options.push_back(Option("-Xint", nullptr));
}
if (!hasStackSize) {
#if defined LINUX && defined X86
// At least OpenJDK 1.8.0's os::workaround_expand_exec_shield_cs_limit
// (hotspot/src/os_cpu/linux_x86/vm/os_linux_x86.cpp) can mmap an rwx
// page into the area that the main stack can grow down to according to
// "ulimit -s", as os::init_2's (hotspot/src/os/linux/vm/os_linux.cpp)
// call to
//
// Linux::capture_initial_stack(JavaThread::stack_size_at_create());
//
// caps _initial_thread_stack_size at threadStackSizeInBytes ,i.e.,
// -Xss, which appears to default to only 327680, whereas "ulimit -s"
// defaults to 8192 * 1024 at least on Fedora 20; so attempt to pass in
// a useful -Xss argument:
rlimit l;
if (getrlimit(RLIMIT_STACK, &l) == 0) {
if (l.rlim_cur == RLIM_INFINITY) {
SAL_INFO("jfw", "RLIMIT_STACK RLIM_INFINITY -> 8192K");
l.rlim_cur = 8192 * 1024;
} else if (l.rlim_cur > 512 * 1024 * 1024) {
SAL_INFO(
"jfw", "huge RLIMIT_STACK " << l.rlim_cur << " -> 8192K");
l.rlim_cur = 8192 * 1024;
}
options.push_back(
Option("-Xss" + OString::number(l.rlim_cur), nullptr));
} else {
int e = errno;
SAL_WARN("jfw", "getrlimit(RLIMIT_STACK) failed with errno " << e);
}
#endif
}
boost::scoped_array<JavaVMOption> sarOptions(new JavaVMOption[options.size()]);
for (std::vector<Option>::size_type i = 0; i != options.size(); ++i) {