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8215962: Support ThreadPriorityPolicy mode 1 for non-root users on linux/bsd

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Reviewed-by: dcubed, dholmes
This commit is contained in:
Matthias Baesken 2019-01-04 17:46:56 +01:00
parent 839d71f4ca
commit db1518dae2
3 changed files with 15 additions and 15 deletions
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14
src/hotspot/os/bsd/os_bsd.cpp
View file

@ -1,5 +1,5 @@
/*
* Copyright (c) 1999, 2018, Oracle and/or its affiliates. All rights reserved.
* Copyright (c) 1999, 2019, Oracle and/or its affiliates. All rights reserved.
* DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
*
* This code is free software; you can redistribute it and/or modify it
@ -2256,7 +2256,8 @@ void os::naked_yield() {
// not the entire user process, and user level threads are 1:1 mapped to kernel
// threads. It has always been the case, but could change in the future. For
// this reason, the code should not be used as default (ThreadPriorityPolicy=0).
// It is only used when ThreadPriorityPolicy=1 and requires root privilege.
// It is only used when ThreadPriorityPolicy=1 and may require system level permission
// (e.g., root privilege or CAP_SYS_NICE capability).
#if !defined(__APPLE__)
int os::java_to_os_priority[CriticalPriority + 1] = {
@ -2303,14 +2304,12 @@ int os::java_to_os_priority[CriticalPriority + 1] = {
static int prio_init() {
if (ThreadPriorityPolicy == 1) {
// Only root can raise thread priority. Don't allow ThreadPriorityPolicy=1
// if effective uid is not root. Perhaps, a more elegant way of doing
// this is to test CAP_SYS_NICE capability, but that will require libcap.so
if (geteuid() != 0) {
if (!FLAG_IS_DEFAULT(ThreadPriorityPolicy)) {
warning("-XX:ThreadPriorityPolicy requires root privilege on Bsd");
warning("-XX:ThreadPriorityPolicy=1 may require system level permission, " \
"e.g., being the root user. If the necessary permission is not " \
"possessed, changes to priority will be silently ignored.");
}
ThreadPriorityPolicy = 0;
}
}
if (UseCriticalJavaThreadPriority) {
@ -2327,6 +2326,7 @@ OSReturn os::set_native_priority(Thread* thread, int newpri) {
return OS_OK;
#elif defined(__FreeBSD__)
int ret = pthread_setprio(thread->osthread()->pthread_id(), newpri);
return (ret == 0) ? OS_OK : OS_ERR;
#elif defined(__APPLE__) || defined(__NetBSD__)
struct sched_param sp;
int policy;

13
src/hotspot/os/linux/os_linux.cpp
View file

@ -1,5 +1,5 @@
/*
* Copyright (c) 1999, 2018, Oracle and/or its affiliates. All rights reserved.
* Copyright (c) 1999, 2019, Oracle and/or its affiliates. All rights reserved.
* DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
*
* This code is free software; you can redistribute it and/or modify it
@ -4076,7 +4076,8 @@ void os::naked_yield() {
// not the entire user process, and user level threads are 1:1 mapped to kernel
// threads. It has always been the case, but could change in the future. For
// this reason, the code should not be used as default (ThreadPriorityPolicy=0).
// It is only used when ThreadPriorityPolicy=1 and requires root privilege.
// It is only used when ThreadPriorityPolicy=1 and may require system level permission
// (e.g., root privilege or CAP_SYS_NICE capability).
int os::java_to_os_priority[CriticalPriority + 1] = {
19, // 0 Entry should never be used
@ -4100,14 +4101,12 @@ int os::java_to_os_priority[CriticalPriority + 1] = {
static int prio_init() {
if (ThreadPriorityPolicy == 1) {
// Only root can raise thread priority. Don't allow ThreadPriorityPolicy=1
// if effective uid is not root. Perhaps, a more elegant way of doing
// this is to test CAP_SYS_NICE capability, but that will require libcap.so
if (geteuid() != 0) {
if (!FLAG_IS_DEFAULT(ThreadPriorityPolicy)) {
warning("-XX:ThreadPriorityPolicy requires root privilege on Linux");
warning("-XX:ThreadPriorityPolicy=1 may require system level permission, " \
"e.g., being the root user. If the necessary permission is not " \
"possessed, changes to priority will be silently ignored.");
}
ThreadPriorityPolicy = 0;
}
}
if (UseCriticalJavaThreadPriority) {

3
src/hotspot/share/runtime/globals.hpp
View file

@ -2049,7 +2049,8 @@ define_pd_global(uint64_t,MaxRAM, 1ULL*G);
" to higher native thread priorities. This policy should be "\
" used with care, as sometimes it can cause performance "\
" degradation in the application and/or the entire system. On "\
" Linux this policy requires root privilege.") \
" Linux/BSD/macOS this policy requires root privilege or an "\
" extended capability.") \
range(0, 1) \
\
product(bool, ThreadPriorityVerbose, false, \