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8031126: java/lang/management/ThreadMXBean/ThreadUserTime.java fails intermittently

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Reviewed-by: coleenp, simonis, goetz, gthornbr
This commit is contained in:
Staffan Larsen 2014-05-05 20:17:19 +02:00
parent 0b8b6462e4
commit a51135b202
1 changed files with 1 additions and 19 deletions
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20
hotspot/src/os/linux/vm/os_linux.cpp
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@ -5271,7 +5271,6 @@ jlong os::thread_cpu_time(Thread *thread, bool user_sys_cpu_time) {
//
static jlong slow_thread_cpu_time(Thread *thread, bool user_sys_cpu_time) {
static bool proc_task_unchecked = true;
pid_t tid = thread->osthread()->thread_id();
char *s;
char stat[2048];
@ -5284,24 +5283,7 @@ static jlong slow_thread_cpu_time(Thread *thread, bool user_sys_cpu_time) {
long ldummy;
FILE *fp;
snprintf(proc_name, 64, "/proc/%d/stat", tid);
// The /proc/<tid>/stat aggregates per-process usage on
// new Linux kernels 2.6+ where NPTL is supported.
// The /proc/self/task/<tid>/stat still has the per-thread usage.
// See bug 6328462.
// There possibly can be cases where there is no directory
// /proc/self/task, so we check its availability.
if (proc_task_unchecked && os::Linux::is_NPTL()) {
// This is executed only once
proc_task_unchecked = false;
fp = fopen("/proc/self/task", "r");
if (fp != NULL) {
snprintf(proc_name, 64, "/proc/self/task/%d/stat", tid);
fclose(fp);
}
}
snprintf(proc_name, 64, "/proc/self/task/%d/stat", tid);
fp = fopen(proc_name, "r");
if ( fp == NULL ) return -1;
statlen = fread(stat, 1, 2047, fp);