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7082553: Interpret Thread.setPriority(Thread.MAX_PRIORITY) to mean FX60 on Solaris 10 and 11

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Add CriticalPriority == MaxPriority+1 and enable scheduling class as well as thread priority to change on Solaris.

Reviewed-by: dholmes, dcubed
This commit is contained in:
Paul Hohensee 2012-01-26 20:06:06 -05:00
parent 7ece654913
commit 09e21afaaa
9 changed files with 289 additions and 140 deletions
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23
hotspot/src/os/bsd/vm/os_bsd.cpp
View file

@ -1,5 +1,5 @@
/*
* Copyright (c) 1999, 2011, Oracle and/or its affiliates. All rights reserved.
* Copyright (c) 1999, 2012, 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
@ -3589,7 +3589,7 @@ void os::loop_breaker(int attempts) {
// It is only used when ThreadPriorityPolicy=1 and requires root privilege.
#if defined(_ALLBSD_SOURCE) && !defined(__APPLE__)
int os::java_to_os_priority[MaxPriority + 1] = {
int os::java_to_os_priority[CriticalPriority + 1] = {
19, // 0 Entry should never be used
0, // 1 MinPriority
@ -3604,11 +3604,13 @@ int os::java_to_os_priority[MaxPriority + 1] = {
25, // 8
28, // 9 NearMaxPriority
31 // 10 MaxPriority
31, // 10 MaxPriority
31 // 11 CriticalPriority
};
#elif defined(__APPLE__)
/* Using Mach high-level priority assignments */
int os::java_to_os_priority[MaxPriority + 1] = {
int os::java_to_os_priority[CriticalPriority + 1] = {
0, // 0 Entry should never be used (MINPRI_USER)
27, // 1 MinPriority
@ -3623,10 +3625,12 @@ int os::java_to_os_priority[MaxPriority + 1] = {
34, // 8
35, // 9 NearMaxPriority
36 // 10 MaxPriority
36, // 10 MaxPriority
36 // 11 CriticalPriority
};
#else
int os::java_to_os_priority[MaxPriority + 1] = {
int os::java_to_os_priority[CriticalPriority + 1] = {
19, // 0 Entry should never be used
4, // 1 MinPriority
@ -3641,7 +3645,9 @@ int os::java_to_os_priority[MaxPriority + 1] = {
-3, // 8
-4, // 9 NearMaxPriority
-5 // 10 MaxPriority
-5, // 10 MaxPriority
-5 // 11 CriticalPriority
};
#endif
@ -3657,6 +3663,9 @@ static int prio_init() {
ThreadPriorityPolicy = 0;
}
}
if (UseCriticalJavaThreadPriority) {
os::java_to_os_priority[MaxPriority] = os::java_to_os_priority[CriticalPriority];
}
return 0;
}

11
hotspot/src/os/linux/vm/os_linux.cpp
View file

@ -1,5 +1,5 @@
/*
* Copyright (c) 1999, 2011, Oracle and/or its affiliates. All rights reserved.
* Copyright (c) 1999, 2012, 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
@ -3383,7 +3383,7 @@ void os::loop_breaker(int attempts) {
// this reason, the code should not be used as default (ThreadPriorityPolicy=0).
// It is only used when ThreadPriorityPolicy=1 and requires root privilege.
int os::java_to_os_priority[MaxPriority + 1] = {
int os::java_to_os_priority[CriticalPriority + 1] = {
19, // 0 Entry should never be used
4, // 1 MinPriority
@ -3398,7 +3398,9 @@ int os::java_to_os_priority[MaxPriority + 1] = {
-3, // 8
-4, // 9 NearMaxPriority
-5 // 10 MaxPriority
-5, // 10 MaxPriority
-5 // 11 CriticalPriority
};
static int prio_init() {
@ -3413,6 +3415,9 @@ static int prio_init() {
ThreadPriorityPolicy = 0;
}
}
if (UseCriticalJavaThreadPriority) {
os::java_to_os_priority[MaxPriority] = os::java_to_os_priority[CriticalPriority];
}
return 0;
}

17
hotspot/src/os/solaris/vm/osThread_solaris.hpp
View file

@ -1,5 +1,5 @@
/*
* Copyright (c) 1997, 2010, Oracle and/or its affiliates. All rights reserved.
* Copyright (c) 1997, 2012, 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
@ -28,17 +28,17 @@
// This is embedded via include into the class OSThread
private:
thread_t _thread_id; // Solaris thread id
unsigned int _lwp_id; // lwp ID, only used with bound threads
uint _lwp_id; // lwp ID, only used with bound threads
int _native_priority; // Saved native priority when starting
// a bound thread
sigset_t _caller_sigmask; // Caller's signal mask
bool _vm_created_thread; // true if the VM create this thread
bool _vm_created_thread; // true if the VM created this thread,
// false if primary thread or attached thread
public:
thread_t thread_id() const { return _thread_id; }
unsigned int lwp_id() const { return _lwp_id; }
uint lwp_id() const { return _lwp_id; }
int native_priority() const { return _native_priority; }
// Set and get state of _vm_created_thread flag
void set_vm_created() { _vm_created_thread = true; }
@ -63,7 +63,8 @@
}
#endif
void set_thread_id(thread_t id) { _thread_id = id; }
void set_lwp_id(unsigned int id){ _lwp_id = id; }
void set_lwp_id(uint id) { _lwp_id = id; }
void set_native_priority(int prio) { _native_priority = prio; }
// ***************************************************************
// interrupt support. interrupts (using signals) are used to get

212
hotspot/src/os/solaris/vm/os_solaris.cpp
View file

@ -1,5 +1,5 @@
/*
* Copyright (c) 1997, 2011, Oracle and/or its affiliates. All rights reserved.
* Copyright (c) 1997, 2012, 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
@ -114,6 +114,7 @@
# include <sys/rtpriocntl.h>
# include <sys/tspriocntl.h>
# include <sys/iapriocntl.h>
# include <sys/fxpriocntl.h>
# include <sys/loadavg.h>
# include <string.h>
# include <stdio.h>
@ -215,8 +216,9 @@ struct memcntl_mha {
#define MaximumPriority 127
// Values for ThreadPriorityPolicy == 1
int prio_policy1[MaxPriority+1] = { -99999, 0, 16, 32, 48, 64,
80, 96, 112, 124, 127 };
int prio_policy1[CriticalPriority+1] = {
-99999, 0, 16, 32, 48, 64,
80, 96, 112, 124, 127, 127 };
// System parameters used internally
static clock_t clock_tics_per_sec = 100;
@ -1048,14 +1050,21 @@ extern "C" void* java_start(void* thread_addr) {
}
// If the creator called set priority before we started,
// we need to call set priority now that we have an lwp.
// Get the priority from libthread and set the priority
// for the new Solaris lwp.
// we need to call set_native_priority now that we have an lwp.
// We used to get the priority from thr_getprio (we called
// thr_setprio way back in create_thread) and pass it to
// set_native_priority, but Solaris scales the priority
// in java_to_os_priority, so when we read it back here,
// we pass trash to set_native_priority instead of what's
// in java_to_os_priority. So we save the native priority
// in the osThread and recall it here.
if ( osthr->thread_id() != -1 ) {
if ( UseThreadPriorities ) {
thr_getprio(osthr->thread_id(), &prio);
int prio = osthr->native_priority();
if (ThreadPriorityVerbose) {
tty->print_cr("Starting Thread " INTPTR_FORMAT ", LWP is " INTPTR_FORMAT ", setting priority: %d\n",
tty->print_cr("Starting Thread " INTPTR_FORMAT ", LWP is "
INTPTR_FORMAT ", setting priority: %d\n",
osthr->thread_id(), osthr->lwp_id(), prio);
}
os::set_native_priority(thread, prio);
@ -1353,13 +1362,12 @@ bool os::create_thread(Thread* thread, ThreadType thr_type, size_t stack_size) {
// Remember that we created this thread so we can set priority on it
osthread->set_vm_created();
// Set the default thread priority otherwise use NormalPriority
if ( UseThreadPriorities ) {
thr_setprio(tid, (DefaultThreadPriority == -1) ?
// Set the default thread priority. If using bound threads, setting
// lwp priority will be delayed until thread start.
set_native_priority(thread,
DefaultThreadPriority == -1 ?
java_to_os_priority[NormPriority] :
DefaultThreadPriority);
}
// Initial thread state is INITIALIZED, not SUSPENDED
osthread->set_state(INITIALIZED);
@ -3728,7 +3736,7 @@ typedef struct {
} SchedInfo;
static SchedInfo tsLimits, iaLimits, rtLimits;
static SchedInfo tsLimits, iaLimits, rtLimits, fxLimits;
#ifdef ASSERT
static int ReadBackValidate = 1;
@ -3739,6 +3747,8 @@ static int myMax = 0;
static int myCur = 0;
static bool priocntl_enable = false;
static const int criticalPrio = 60; // FX/60 is critical thread class/priority on T4
static int java_MaxPriority_to_os_priority = 0; // Saved mapping
// Call the version of priocntl suitable for all supported versions
// of Solaris. We need to call through this wrapper so that we can
@ -3783,19 +3793,27 @@ int lwp_priocntl_init ()
if (os::Solaris::T2_libthread() || UseBoundThreads) {
// If ThreadPriorityPolicy is 1, switch tables
if (ThreadPriorityPolicy == 1) {
for (i = 0 ; i < MaxPriority+1; i++)
for (i = 0 ; i < CriticalPriority+1; i++)
os::java_to_os_priority[i] = prio_policy1[i];
}
if (UseCriticalJavaThreadPriority) {
// MaxPriority always maps to the FX scheduling class and criticalPrio.
// See set_native_priority() and set_lwp_class_and_priority().
// Save original MaxPriority mapping in case attempt to
// use critical priority fails.
java_MaxPriority_to_os_priority = os::java_to_os_priority[MaxPriority];
// Set negative to distinguish from other priorities
os::java_to_os_priority[MaxPriority] = -criticalPrio;
}
}
// Not using Bound Threads, set to ThreadPolicy 1
else {
for ( i = 0 ; i < MaxPriority+1; i++ ) {
for ( i = 0 ; i < CriticalPriority+1; i++ ) {
os::java_to_os_priority[i] = prio_policy1[i];
}
return 0;
}
// Get IDs for a set of well-known scheduling classes.
// TODO-FIXME: GETCLINFO returns the current # of classes in the
// the system. We should have a loop that iterates over the
@ -3828,9 +3846,17 @@ int lwp_priocntl_init ()
rtLimits.maxPrio = ((rtinfo_t*)ClassInfo.pc_clinfo)->rt_maxpri;
rtLimits.minPrio = 0;
strcpy(ClassInfo.pc_clname, "FX");
ClassInfo.pc_cid = -1;
rslt = (*priocntl_ptr)(PC_VERSION, P_ALL, 0, PC_GETCID, (caddr_t)&ClassInfo);
if (rslt < 0) return errno;
assert(ClassInfo.pc_cid != -1, "cid for FX class is -1");
fxLimits.schedPolicy = ClassInfo.pc_cid;
fxLimits.maxPrio = ((fxinfo_t*)ClassInfo.pc_clinfo)->fx_maxupri;
fxLimits.minPrio = 0;
// Query our "current" scheduling class.
// This will normally be IA,TS or, rarely, RT.
// This will normally be IA, TS or, rarely, FX or RT.
memset(&ParmInfo, 0, sizeof(ParmInfo));
ParmInfo.pc_cid = PC_CLNULL;
rslt = (*priocntl_ptr) (PC_VERSION, P_PID, P_MYID, PC_GETPARMS, (caddr_t)&ParmInfo);
@ -3838,14 +3864,15 @@ int lwp_priocntl_init ()
myClass = ParmInfo.pc_cid;
// We now know our scheduling classId, get specific information
// the class.
// about the class.
ClassInfo.pc_cid = myClass;
ClassInfo.pc_clname[0] = 0;
rslt = (*priocntl_ptr) (PC_VERSION, (idtype)0, 0, PC_GETCLINFO, (caddr_t)&ClassInfo);
if (rslt < 0) return errno;
if (ThreadPriorityVerbose)
if (ThreadPriorityVerbose) {
tty->print_cr("lwp_priocntl_init: Class=%d(%s)...", myClass, ClassInfo.pc_clname);
}
memset(&ParmInfo, 0, sizeof(pcparms_t));
ParmInfo.pc_cid = PC_CLNULL;
@ -3865,6 +3892,11 @@ int lwp_priocntl_init ()
myMin = tsLimits.minPrio;
myMax = tsLimits.maxPrio;
myMax = MIN2(myMax, (int)tsInfo->ts_uprilim); // clamp - restrict
} else if (ParmInfo.pc_cid == fxLimits.schedPolicy) {
fxparms_t *fxInfo = (fxparms_t*)ParmInfo.pc_clparms;
myMin = fxLimits.minPrio;
myMax = fxLimits.maxPrio;
myMax = MIN2(myMax, (int)fxInfo->fx_uprilim); // clamp - restrict
} else {
// No clue - punt
if (ThreadPriorityVerbose)
@ -3872,8 +3904,9 @@ int lwp_priocntl_init ()
return EINVAL; // no clue, punt
}
if (ThreadPriorityVerbose)
if (ThreadPriorityVerbose) {
tty->print_cr ("Thread priority Range: [%d..%d]\n", myMin, myMax);
}
priocntl_enable = true; // Enable changing priorities
return 0;
@ -3882,6 +3915,7 @@ int lwp_priocntl_init ()
#define IAPRI(x) ((iaparms_t *)((x).pc_clparms))
#define RTPRI(x) ((rtparms_t *)((x).pc_clparms))
#define TSPRI(x) ((tsparms_t *)((x).pc_clparms))
#define FXPRI(x) ((fxparms_t *)((x).pc_clparms))
// scale_to_lwp_priority
@ -3900,13 +3934,13 @@ int scale_to_lwp_priority (int rMin, int rMax, int x)
}
// set_lwp_priority
// set_lwp_class_and_priority
//
// Set the priority of the lwp. This call should only be made
// when using bound threads (T2 threads are bound by default).
// Set the class and priority of the lwp. This call should only
// be made when using bound threads (T2 threads are bound by default).
//
int set_lwp_priority (int ThreadID, int lwpid, int newPrio )
{
int set_lwp_class_and_priority(int ThreadID, int lwpid,
int newPrio, int new_class, bool scale) {
int rslt;
int Actual, Expected, prv;
pcparms_t ParmInfo; // for GET-SET
@ -3927,19 +3961,20 @@ int set_lwp_priority (int ThreadID, int lwpid, int newPrio )
return EINVAL;
}
// If lwp hasn't started yet, just return
// the _start routine will call us again.
if ( lwpid <= 0 ) {
if (ThreadPriorityVerbose) {
tty->print_cr ("deferring the set_lwp_priority of thread " INTPTR_FORMAT " to %d, lwpid not set",
tty->print_cr ("deferring the set_lwp_class_and_priority of thread "
INTPTR_FORMAT " to %d, lwpid not set",
ThreadID, newPrio);
}
return 0;
}
if (ThreadPriorityVerbose) {
tty->print_cr ("set_lwp_priority(" INTPTR_FORMAT "@" INTPTR_FORMAT " %d) ",
tty->print_cr ("set_lwp_class_and_priority("
INTPTR_FORMAT "@" INTPTR_FORMAT " %d) ",
ThreadID, lwpid, newPrio);
}
@ -3948,38 +3983,68 @@ int set_lwp_priority (int ThreadID, int lwpid, int newPrio )
rslt = (*priocntl_ptr)(PC_VERSION, P_LWPID, lwpid, PC_GETPARMS, (caddr_t)&ParmInfo);
if (rslt < 0) return errno;
if (ParmInfo.pc_cid == rtLimits.schedPolicy) {
int cur_class = ParmInfo.pc_cid;
ParmInfo.pc_cid = (id_t)new_class;
if (new_class == rtLimits.schedPolicy) {
rtparms_t *rtInfo = (rtparms_t*)ParmInfo.pc_clparms;
rtInfo->rt_pri = scale_to_lwp_priority (rtLimits.minPrio, rtLimits.maxPrio, newPrio);
rtInfo->rt_pri = scale ? scale_to_lwp_priority(rtLimits.minPrio,
rtLimits.maxPrio, newPrio)
: newPrio;
rtInfo->rt_tqsecs = RT_NOCHANGE;
rtInfo->rt_tqnsecs = RT_NOCHANGE;
if (ThreadPriorityVerbose) {
tty->print_cr("RT: %d->%d\n", newPrio, rtInfo->rt_pri);
}
} else if (ParmInfo.pc_cid == iaLimits.schedPolicy) {
} else if (new_class == iaLimits.schedPolicy) {
iaparms_t* iaInfo = (iaparms_t*)ParmInfo.pc_clparms;
int maxClamped = MIN2(iaLimits.maxPrio, (int)iaInfo->ia_uprilim);
iaInfo->ia_upri = scale_to_lwp_priority(iaLimits.minPrio, maxClamped, newPrio);
iaInfo->ia_uprilim = IA_NOCHANGE;
int maxClamped = MIN2(iaLimits.maxPrio,
cur_class == new_class
? (int)iaInfo->ia_uprilim : iaLimits.maxPrio);
iaInfo->ia_upri = scale ? scale_to_lwp_priority(iaLimits.minPrio,
maxClamped, newPrio)
: newPrio;
iaInfo->ia_uprilim = cur_class == new_class
? IA_NOCHANGE : (pri_t)iaLimits.maxPrio;
iaInfo->ia_mode = IA_NOCHANGE;
iaInfo->ia_nice = cur_class == new_class ? IA_NOCHANGE : NZERO;
if (ThreadPriorityVerbose) {
tty->print_cr("IA: [%d...%d] %d->%d\n",
iaLimits.minPrio, maxClamped, newPrio, iaInfo->ia_upri);
}
} else if (ParmInfo.pc_cid == tsLimits.schedPolicy) {
} else if (new_class == tsLimits.schedPolicy) {
tsparms_t* tsInfo = (tsparms_t*)ParmInfo.pc_clparms;
int maxClamped = MIN2(tsLimits.maxPrio, (int)tsInfo->ts_uprilim);
prv = tsInfo->ts_upri;
tsInfo->ts_upri = scale_to_lwp_priority(tsLimits.minPrio, maxClamped, newPrio);
tsInfo->ts_uprilim = IA_NOCHANGE;
int maxClamped = MIN2(tsLimits.maxPrio,
cur_class == new_class
? (int)tsInfo->ts_uprilim : tsLimits.maxPrio);
tsInfo->ts_upri = scale ? scale_to_lwp_priority(tsLimits.minPrio,
maxClamped, newPrio)
: newPrio;
tsInfo->ts_uprilim = cur_class == new_class
? TS_NOCHANGE : (pri_t)tsLimits.maxPrio;
if (ThreadPriorityVerbose) {
tty->print_cr ("TS: %d [%d...%d] %d->%d\n",
prv, tsLimits.minPrio, maxClamped, newPrio, tsInfo->ts_upri);
tty->print_cr("TS: [%d...%d] %d->%d\n",
tsLimits.minPrio, maxClamped, newPrio, tsInfo->ts_upri);
}
} else if (new_class == fxLimits.schedPolicy) {
fxparms_t* fxInfo = (fxparms_t*)ParmInfo.pc_clparms;
int maxClamped = MIN2(fxLimits.maxPrio,
cur_class == new_class
? (int)fxInfo->fx_uprilim : fxLimits.maxPrio);
fxInfo->fx_upri = scale ? scale_to_lwp_priority(fxLimits.minPrio,
maxClamped, newPrio)
: newPrio;
fxInfo->fx_uprilim = cur_class == new_class
? FX_NOCHANGE : (pri_t)fxLimits.maxPrio;
fxInfo->fx_tqsecs = FX_NOCHANGE;
fxInfo->fx_tqnsecs = FX_NOCHANGE;
if (ThreadPriorityVerbose) {
tty->print_cr("FX: [%d...%d] %d->%d\n",
fxLimits.minPrio, maxClamped, newPrio, fxInfo->fx_upri);
}
if (prv == tsInfo->ts_upri) return 0;
} else {
if (ThreadPriorityVerbose) {
tty->print_cr ("Unknown scheduling class\n");
tty->print_cr("Unknown new scheduling class %d\n", new_class);
}
return EINVAL; // no clue, punt
}
@ -4016,15 +4081,19 @@ int set_lwp_priority (int ThreadID, int lwpid, int newPrio )
} else if (ParmInfo.pc_cid == tsLimits.schedPolicy) {
Actual = TSPRI(ReadBack)->ts_upri;
Expected = TSPRI(ParmInfo)->ts_upri;
} else if (ParmInfo.pc_cid == fxLimits.schedPolicy) {
Actual = FXPRI(ReadBack)->fx_upri;
Expected = FXPRI(ParmInfo)->fx_upri;
} else {
if (ThreadPriorityVerbose) {
tty->print_cr("set_lwp_priority: unexpected class in readback: %d\n", ParmInfo.pc_cid);
tty->print_cr("set_lwp_class_and_priority: unexpected class in readback: %d\n",
ParmInfo.pc_cid);
}
}
if (Actual != Expected) {
if (ThreadPriorityVerbose) {
tty->print_cr ("set_lwp_priority(%d %d) Class=%d: actual=%d vs expected=%d\n",
tty->print_cr ("set_lwp_class_and_priority(%d %d) Class=%d: actual=%d vs expected=%d\n",
lwpid, newPrio, ReadBack.pc_cid, Actual, Expected);
}
}
@ -4033,8 +4102,6 @@ int set_lwp_priority (int ThreadID, int lwpid, int newPrio )
return 0;
}
// Solaris only gives access to 128 real priorities at a time,
// so we expand Java's ten to fill this range. This would be better
// if we dynamically adjusted relative priorities.
@ -4055,8 +4122,7 @@ int set_lwp_priority (int ThreadID, int lwpid, int newPrio )
// which do not explicitly alter their thread priorities.
//
int os::java_to_os_priority[MaxPriority + 1] = {
int os::java_to_os_priority[CriticalPriority + 1] = {
-99999, // 0 Entry should never be used
0, // 1 MinPriority
@ -4071,17 +4137,51 @@ int os::java_to_os_priority[MaxPriority + 1] = {
127, // 8
127, // 9 NearMaxPriority
127 // 10 MaxPriority
127, // 10 MaxPriority
-criticalPrio // 11 CriticalPriority
};
OSReturn os::set_native_priority(Thread* thread, int newpri) {
OSThread* osthread = thread->osthread();
// Save requested priority in case the thread hasn't been started
osthread->set_native_priority(newpri);
// Check for critical priority request
bool fxcritical = false;
if (newpri == -criticalPrio) {
fxcritical = true;
newpri = criticalPrio;
}
assert(newpri >= MinimumPriority && newpri <= MaximumPriority, "bad priority mapping");
if (!UseThreadPriorities) return OS_OK;
int status = thr_setprio(thread->osthread()->thread_id(), newpri);
if ( os::Solaris::T2_libthread() || (UseBoundThreads && thread->osthread()->is_vm_created()) )
status |= (set_lwp_priority (thread->osthread()->thread_id(),
thread->osthread()->lwp_id(), newpri ));
int status = 0;
if (!fxcritical) {
// Use thr_setprio only if we have a priority that thr_setprio understands
status = thr_setprio(thread->osthread()->thread_id(), newpri);
}
if (os::Solaris::T2_libthread() ||
(UseBoundThreads && osthread->is_vm_created())) {
int lwp_status =
set_lwp_class_and_priority(osthread->thread_id(),
osthread->lwp_id(),
newpri,
fxcritical ? fxLimits.schedPolicy : myClass,
!fxcritical);
if (lwp_status != 0 && fxcritical) {
// Try again, this time without changing the scheduling class
newpri = java_MaxPriority_to_os_priority;
lwp_status = set_lwp_class_and_priority(osthread->thread_id(),
osthread->lwp_id(),
newpri, myClass, false);
}
status |= lwp_status;
}
return (status == 0) ? OS_OK : OS_ERR;
}

17
hotspot/src/os/windows/vm/os_windows.cpp
View file

@ -1,5 +1,5 @@
/*
* Copyright (c) 1997, 2011, Oracle and/or its affiliates. All rights reserved.
* Copyright (c) 1997, 2012, 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
@ -3296,7 +3296,7 @@ void os::yield_all(int attempts) {
// so we compress Java's ten down to seven. It would be better
// if we dynamically adjusted relative priorities.
int os::java_to_os_priority[MaxPriority + 1] = {
int os::java_to_os_priority[CriticalPriority + 1] = {
THREAD_PRIORITY_IDLE, // 0 Entry should never be used
THREAD_PRIORITY_LOWEST, // 1 MinPriority
THREAD_PRIORITY_LOWEST, // 2
@ -3307,10 +3307,11 @@ int os::java_to_os_priority[MaxPriority + 1] = {
THREAD_PRIORITY_ABOVE_NORMAL, // 7
THREAD_PRIORITY_ABOVE_NORMAL, // 8
THREAD_PRIORITY_HIGHEST, // 9 NearMaxPriority
THREAD_PRIORITY_HIGHEST // 10 MaxPriority
THREAD_PRIORITY_HIGHEST, // 10 MaxPriority
THREAD_PRIORITY_HIGHEST // 11 CriticalPriority
};
int prio_policy1[MaxPriority + 1] = {
int prio_policy1[CriticalPriority + 1] = {
THREAD_PRIORITY_IDLE, // 0 Entry should never be used
THREAD_PRIORITY_LOWEST, // 1 MinPriority
THREAD_PRIORITY_LOWEST, // 2
@ -3321,17 +3322,21 @@ int prio_policy1[MaxPriority + 1] = {
THREAD_PRIORITY_ABOVE_NORMAL, // 7
THREAD_PRIORITY_HIGHEST, // 8
THREAD_PRIORITY_HIGHEST, // 9 NearMaxPriority
THREAD_PRIORITY_TIME_CRITICAL // 10 MaxPriority
THREAD_PRIORITY_TIME_CRITICAL, // 10 MaxPriority
THREAD_PRIORITY_TIME_CRITICAL // 11 CriticalPriority
};
static int prio_init() {
// If ThreadPriorityPolicy is 1, switch tables
if (ThreadPriorityPolicy == 1) {
int i;
for (i = 0; i < MaxPriority + 1; i++) {
for (i = 0; i < CriticalPriority + 1; i++) {
os::java_to_os_priority[i] = prio_policy1[i];
}
}
if (UseCriticalJavaThreadPriority) {
os::java_to_os_priority[MaxPriority] = os::java_to_os_priority[CriticalPriority] ;
}
return 0;
}

29
hotspot/src/share/vm/compiler/compileBroker.cpp
View file

@ -1,5 +1,5 @@
/*
* Copyright (c) 1999, 2011, Oracle and/or its affiliates. All rights reserved.
* Copyright (c) 1999, 2012, 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
@ -855,30 +855,31 @@ CompilerThread* CompileBroker::make_compiler_thread(const char* name, CompileQue
// Note that this only sets the JavaThread _priority field, which by
// definition is limited to Java priorities and not OS priorities.
// The os-priority is set in the CompilerThread startup code itself
java_lang_Thread::set_priority(thread_oop(), NearMaxPriority);
// CLEANUP PRIORITIES: This -if- statement hids a bug whereby the compiler
// threads never have their OS priority set. The assumption here is to
// enable the Performance group to do flag tuning, figure out a suitable
// CompilerThreadPriority, and then remove this 'if' statement (and
// comment) and unconditionally set the priority.
// Compiler Threads should be at the highest Priority
if ( CompilerThreadPriority != -1 )
os::set_native_priority( compiler_thread, CompilerThreadPriority );
else
os::set_native_priority( compiler_thread, os::java_to_os_priority[NearMaxPriority]);
// Note that I cannot call os::set_priority because it expects Java
// priorities and I am *explicitly* using OS priorities so that it's
// Note that we cannot call os::set_priority because it expects Java
// priorities and we are *explicitly* using OS priorities so that it's
// possible to set the compiler thread priority higher than any Java
// thread.
int native_prio = CompilerThreadPriority;
if (native_prio == -1) {
if (UseCriticalCompilerThreadPriority) {
native_prio = os::java_to_os_priority[CriticalPriority];
} else {
native_prio = os::java_to_os_priority[NearMaxPriority];
}
}
os::set_native_priority(compiler_thread, native_prio);
java_lang_Thread::set_daemon(thread_oop());
compiler_thread->set_threadObj(thread_oop());
Threads::add(compiler_thread);
Thread::start(compiler_thread);
}
// Let go of Threads_lock before yielding
os::yield(); // make sure that the compiler thread is started early (especially helpful on SOLARIS)

25
hotspot/src/share/vm/gc_implementation/concurrentMarkSweep/concurrentMarkSweepThread.cpp
View file

@ -1,5 +1,5 @@
/*
* Copyright (c) 2001, 2011, Oracle and/or its affiliates. All rights reserved.
* Copyright (c) 2001, 2012, 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
@ -75,10 +75,25 @@ ConcurrentMarkSweepThread::ConcurrentMarkSweepThread(CMSCollector* collector)
set_name("Concurrent Mark-Sweep GC Thread");
if (os::create_thread(this, os::cgc_thread)) {
// XXX: need to set this to low priority
// unless "agressive mode" set; priority
// should be just less than that of VMThread.
os::set_priority(this, NearMaxPriority);
// An old comment here said: "Priority should be just less
// than that of VMThread". Since the VMThread runs at
// NearMaxPriority, the old comment was inaccurate, but
// changing the default priority to NearMaxPriority-1
// could change current behavior, so the default of
// NearMaxPriority stays in place.
//
// Note that there's a possibility of the VMThread
// starving if UseCriticalCMSThreadPriority is on.
// That won't happen on Solaris for various reasons,
// but may well happen on non-Solaris platforms.
int native_prio;
if (UseCriticalCMSThreadPriority) {
native_prio = os::java_to_os_priority[CriticalPriority];
} else {
native_prio = os::java_to_os_priority[NearMaxPriority];
}
os::set_native_priority(this, native_prio);
if (!DisableStartThread) {
os::start_thread(this);
}

24
hotspot/src/share/vm/runtime/globals.hpp
View file

@ -1,5 +1,5 @@
/*
* Copyright (c) 1997, 2011, Oracle and/or its affiliates. All rights reserved.
* Copyright (c) 1997, 2012, 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
@ -3477,16 +3477,19 @@ class CommandLineFlags {
" Linux this policy requires root privilege.") \
\
product(bool, ThreadPriorityVerbose, false, \
"print priority changes") \
"Print priority changes") \
\
product(intx, DefaultThreadPriority, -1, \
"what native priority threads run at if not specified elsewhere (-1 means no change)") \
"The native priority at which threads run if not elsewhere " \
"specified (-1 means no change)") \
\
product(intx, CompilerThreadPriority, -1, \
"what priority should compiler threads run at (-1 means no change)") \
"The native priority at which compiler threads should run " \
"(-1 means no change)") \
\
product(intx, VMThreadPriority, -1, \
"what priority should VM threads run at (-1 means no change)") \
"The native priority at which the VM thread should run " \
"(-1 means no change)") \
\
product(bool, CompilerThreadHintNoPreempt, true, \
"(Solaris only) Give compiler threads an extra quanta") \
@ -3505,6 +3508,15 @@ class CommandLineFlags {
product(intx, JavaPriority9_To_OSPriority, -1, "Map Java priorities to OS priorities") \
product(intx, JavaPriority10_To_OSPriority,-1, "Map Java priorities to OS priorities") \
\
experimental(bool, UseCriticalJavaThreadPriority, false, \
"Java thread priority 10 maps to critical scheduling priority") \
\
experimental(bool, UseCriticalCompilerThreadPriority, false, \
"Compiler thread(s) run at critical scheduling priority") \
\
experimental(bool, UseCriticalCMSThreadPriority, false, \
"ConcurrentMarkSweep thread runs at critical scheduling priority")\
\
/* compiler debugging */ \
notproduct(intx, CompileTheWorldStartAt, 1, \
"First class to consider when using +CompileTheWorld") \
@ -3871,7 +3883,7 @@ class CommandLineFlags {
product(bool, UseVMInterruptibleIO, false, \
"(Unstable, Solaris-specific) Thread interrupt before or with " \
"EINTR for I/O operations results in OS_INTRPT. The default value"\
" of this flag is true for JDK 6 and earliers")
" of this flag is true for JDK 6 and earlier")
/*
* Macros for factoring of globals

7
hotspot/src/share/vm/runtime/os.hpp
View file

@ -1,5 +1,5 @@
/*
* Copyright (c) 1997, 2011, Oracle and/or its affiliates. All rights reserved.
* Copyright (c) 1997, 2012, 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
@ -73,8 +73,9 @@ enum ThreadPriority { // JLS 20.20.1-3
MinPriority = 1, // Minimum priority
NormPriority = 5, // Normal (non-daemon) priority
NearMaxPriority = 9, // High priority, used for VMThread
MaxPriority = 10 // Highest priority, used for WatcherThread
MaxPriority = 10, // Highest priority, used for WatcherThread
// ensures that VMThread doesn't starve profiler
CriticalPriority = 11 // Critical thread priority
};
// Typedef for structured exception handling support
@ -733,7 +734,7 @@ class os: AllStatic {
// Thread priority helpers (implemented in OS-specific part)
static OSReturn set_native_priority(Thread* thread, int native_prio);
static OSReturn get_native_priority(const Thread* const thread, int* priority_ptr);
static int java_to_os_priority[MaxPriority + 1];
static int java_to_os_priority[CriticalPriority + 1];
// Hint to the underlying OS that a task switch would not be good.
// Void return because it's a hint and can fail.
static void hint_no_preempt();