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8181319: Make os::Linux::sched_getcpu() available even when UseNUMA is false

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Reviewed-by: dholmes, rehn
This commit is contained in:
Per Lidén 2017-05-31 13:17:00 +02:00
parent 3e24f6d955
commit ce57b75eef
2 changed files with 15 additions and 11 deletions
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25
hotspot/src/os/linux/vm/os_linux.cpp
View File

@ -2815,6 +2815,18 @@ int os::Linux::sched_getcpu_syscall(void) {
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 @@ void* os::Linux::libnuma_v2_dlsym(void* handle, const char* name) {
}
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 @@ jint os::init_2(void) {
#endif
Linux::libpthread_init();
Linux::sched_getcpu_init();
log_info(os)("HotSpot is running with %s, %s",
Linux::glibc_version(), Linux::libpthread_version());

1
hotspot/src/os/linux/vm/os_linux.hpp
View File

@ -170,6 +170,7 @@ class Linux {
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