8181319: Make os::Linux::sched_getcpu() available even when UseNUMA is false
Reviewed-by: dholmes, rehn
--- a/hotspot/src/os/linux/vm/os_linux.cpp Thu Jun 01 02:21:18 2017 +0000
+++ b/hotspot/src/os/linux/vm/os_linux.cpp Wed May 31 13:17:00 2017 +0200
@@ -2815,6 +2815,18 @@
return (retval == -1) ? retval : cpu;
}
+void os::Linux::sched_getcpu_init() {
+ // sched_getcpu() should be in libc.
+ set_sched_getcpu(CAST_TO_FN_PTR(sched_getcpu_func_t,
+ dlsym(RTLD_DEFAULT, "sched_getcpu")));
+
+ // If it's not, try a direct syscall.
+ if (sched_getcpu() == -1) {
+ set_sched_getcpu(CAST_TO_FN_PTR(sched_getcpu_func_t,
+ (void*)&sched_getcpu_syscall));
+ }
+}
+
// Something to do with the numa-aware allocator needs these symbols
extern "C" JNIEXPORT void numa_warn(int number, char *where, ...) { }
extern "C" JNIEXPORT void numa_error(char *where) { }
@@ -2836,17 +2848,7 @@
}
bool os::Linux::libnuma_init() {
- // sched_getcpu() should be in libc.
- set_sched_getcpu(CAST_TO_FN_PTR(sched_getcpu_func_t,
- dlsym(RTLD_DEFAULT, "sched_getcpu")));
-
- // If it's not, try a direct syscall.
- if (sched_getcpu() == -1) {
- set_sched_getcpu(CAST_TO_FN_PTR(sched_getcpu_func_t,
- (void*)&sched_getcpu_syscall));
- }
-
- if (sched_getcpu() != -1) { // Does it work?
+ if (sched_getcpu() != -1) { // Requires sched_getcpu() support
void *handle = dlopen("libnuma.so.1", RTLD_LAZY);
if (handle != NULL) {
set_numa_node_to_cpus(CAST_TO_FN_PTR(numa_node_to_cpus_func_t,
@@ -4875,6 +4877,7 @@
#endif
Linux::libpthread_init();
+ Linux::sched_getcpu_init();
log_info(os)("HotSpot is running with %s, %s",
Linux::glibc_version(), Linux::libpthread_version());
--- a/hotspot/src/os/linux/vm/os_linux.hpp Thu Jun 01 02:21:18 2017 +0000
+++ b/hotspot/src/os/linux/vm/os_linux.hpp Wed May 31 13:17:00 2017 +0200
@@ -170,6 +170,7 @@
static const char *libpthread_version() { return _libpthread_version; }
static void libpthread_init();
+ static void sched_getcpu_init();
static bool libnuma_init();
static void* libnuma_dlsym(void* handle, const char* name);
// libnuma v2 (libnuma_1.2) symbols