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8149383: Convert TraceBiasedLocking to Unified Logging

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The former -XX:+TraceBiasedLocking flag has been converted to the UL option -Xlog:biasedlocking=info and =trace, with the old option being aliased.

Reviewed-by: dholmes, dcubed
This commit is contained in:
Rachel Protacio 2016-02-18 17:10:48 -05:00
parent af854404be
commit 3cf4e3909c
6 changed files with 153 additions and 60 deletions
Download patch file Download diff file Expand all files Collapse all files

1
hotspot/src/share/vm/runtime/arguments.cpp
View file

@ -409,6 +409,7 @@ static AliasedLoggingFlag const aliased_logging_flags[] = {
{ "TraceClassResolution", LogLevel::Info, true, LogTag::_classresolve },
{ "TraceExceptions", LogLevel::Info, true, LogTag::_exceptions },
{ "TraceMonitorInflation", LogLevel::Debug, true, LogTag::_monitorinflation },
{ "TraceBiasedLocking", LogLevel::Info, true, LogTag::_biasedlocking },
{ NULL, LogLevel::Off, false, LogTag::__NO_TAG }
};

121
hotspot/src/share/vm/runtime/biasedLocking.cpp
View file

@ -1,5 +1,5 @@
/*
* Copyright (c) 2005, 2015, Oracle and/or its affiliates. All rights reserved.
* Copyright (c) 2005, 2016, 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
@ -23,6 +23,8 @@
*/
#include "precompiled.hpp"
#include "logging/log.hpp"
#include "memory/resourceArea.hpp"
#include "oops/klass.inline.hpp"
#include "oops/markOop.hpp"
#include "oops/oop.inline.hpp"
@ -60,9 +62,7 @@ class VM_EnableBiasedLocking: public VM_Operation {
// Indicate that future instances should enable it as well
_biased_locking_enabled = true;
if (TraceBiasedLocking) {
tty->print_cr("Biased locking enabled");
}
log_info(biasedlocking)("Biased locking enabled");
}
bool allow_nested_vm_operations() const { return false; }
@ -144,14 +144,14 @@ static GrowableArray<MonitorInfo*>* get_or_compute_monitor_info(JavaThread* thre
return info;
}
static BiasedLocking::Condition revoke_bias(oop obj, bool allow_rebias, bool is_bulk, JavaThread* requesting_thread) {
markOop mark = obj->mark();
if (!mark->has_bias_pattern()) {
if (TraceBiasedLocking) {
if (log_is_enabled(Info, biasedlocking)) {
ResourceMark rm;
tty->print_cr(" (Skipping revocation of object of type %s because it's no longer biased)",
obj->klass()->external_name());
log_info(biasedlocking)(" (Skipping revocation of object of type %s "
"because it's no longer biased)",
obj->klass()->external_name());
}
return BiasedLocking::NOT_BIASED;
}
@ -160,10 +160,29 @@ static BiasedLocking::Condition revoke_bias(oop obj, bool allow_rebias, bool is_
markOop biased_prototype = markOopDesc::biased_locking_prototype()->set_age(age);
markOop unbiased_prototype = markOopDesc::prototype()->set_age(age);
if (TraceBiasedLocking && (Verbose || !is_bulk)) {
// Log at "info" level if not bulk, else "trace" level
if (!is_bulk) {
ResourceMark rm;
tty->print_cr("Revoking bias of object " INTPTR_FORMAT " , mark " INTPTR_FORMAT " , type %s , prototype header " INTPTR_FORMAT " , allow rebias %d , requesting thread " INTPTR_FORMAT,
p2i((void *)obj), (intptr_t) mark, obj->klass()->external_name(), (intptr_t) obj->klass()->prototype_header(), (allow_rebias ? 1 : 0), (intptr_t) requesting_thread);
log_info(biasedlocking)("Revoking bias of object " INTPTR_FORMAT " , mark "
INTPTR_FORMAT " , type %s , prototype header " INTPTR_FORMAT
" , allow rebias %d , requesting thread " INTPTR_FORMAT,
p2i((void *)obj),
(intptr_t) mark,
obj->klass()->external_name(),
(intptr_t) obj->klass()->prototype_header(),
(allow_rebias ? 1 : 0),
(intptr_t) requesting_thread);
} else {
ResourceMark rm;
log_trace(biasedlocking)("Revoking bias of object " INTPTR_FORMAT " , mark "
INTPTR_FORMAT " , type %s , prototype header " INTPTR_FORMAT
" , allow rebias %d , requesting thread " INTPTR_FORMAT,
p2i((void *)obj),
(intptr_t) mark,
obj->klass()->external_name(),
(intptr_t) obj->klass()->prototype_header(),
(allow_rebias ? 1 : 0),
(intptr_t) requesting_thread);
}
JavaThread* biased_thread = mark->biased_locker();
@ -174,8 +193,11 @@ static BiasedLocking::Condition revoke_bias(oop obj, bool allow_rebias, bool is_
if (!allow_rebias) {
obj->set_mark(unbiased_prototype);
}
if (TraceBiasedLocking && (Verbose || !is_bulk)) {
tty->print_cr(" Revoked bias of anonymously-biased object");
// Log at "info" level if not bulk, else "trace" level
if (!is_bulk) {
log_info(biasedlocking)(" Revoked bias of anonymously-biased object");
} else {
log_trace(biasedlocking)(" Revoked bias of anonymously-biased object");
}
return BiasedLocking::BIAS_REVOKED;
}
@ -198,8 +220,11 @@ static BiasedLocking::Condition revoke_bias(oop obj, bool allow_rebias, bool is_
} else {
obj->set_mark(unbiased_prototype);
}
if (TraceBiasedLocking && (Verbose || !is_bulk)) {
tty->print_cr(" Revoked bias of object biased toward dead thread");
// Log at "info" level if not bulk, else "trace" level
if (!is_bulk) {
log_info(biasedlocking)(" Revoked bias of object biased toward dead thread");
} else {
log_trace(biasedlocking)(" Revoked bias of object biased toward dead thread");
}
return BiasedLocking::BIAS_REVOKED;
}
@ -214,21 +239,17 @@ static BiasedLocking::Condition revoke_bias(oop obj, bool allow_rebias, bool is_
for (int i = 0; i < cached_monitor_info->length(); i++) {
MonitorInfo* mon_info = cached_monitor_info->at(i);
if (mon_info->owner() == obj) {
if (TraceBiasedLocking && Verbose) {
tty->print_cr(" mon_info->owner (" PTR_FORMAT ") == obj (" PTR_FORMAT ")",
p2i((void *) mon_info->owner()),
p2i((void *) obj));
}
log_trace(biasedlocking)(" mon_info->owner (" PTR_FORMAT ") == obj (" PTR_FORMAT ")",
p2i((void *) mon_info->owner()),
p2i((void *) obj));
// Assume recursive case and fix up highest lock later
markOop mark = markOopDesc::encode((BasicLock*) NULL);
highest_lock = mon_info->lock();
highest_lock->set_displaced_header(mark);
} else {
if (TraceBiasedLocking && Verbose) {
tty->print_cr(" mon_info->owner (" PTR_FORMAT ") != obj (" PTR_FORMAT ")",
p2i((void *) mon_info->owner()),
p2i((void *) obj));
}
log_trace(biasedlocking)(" mon_info->owner (" PTR_FORMAT ") != obj (" PTR_FORMAT ")",
p2i((void *) mon_info->owner()),
p2i((void *) obj));
}
}
if (highest_lock != NULL) {
@ -240,12 +261,18 @@ static BiasedLocking::Condition revoke_bias(oop obj, bool allow_rebias, bool is_
// ordering (e.g. ppc).
obj->release_set_mark(markOopDesc::encode(highest_lock));
assert(!obj->mark()->has_bias_pattern(), "illegal mark state: stack lock used bias bit");
if (TraceBiasedLocking && (Verbose || !is_bulk)) {
tty->print_cr(" Revoked bias of currently-locked object");
// Log at "info" level if not bulk, else "trace" level
if (!is_bulk) {
log_info(biasedlocking)(" Revoked bias of currently-locked object");
} else {
log_trace(biasedlocking)(" Revoked bias of currently-locked object");
}
} else {
if (TraceBiasedLocking && (Verbose || !is_bulk)) {
tty->print_cr(" Revoked bias of currently-unlocked object");
// Log at "info" level if not bulk, else "trace" level
if (!is_bulk) {
log_info(biasedlocking)(" Revoked bias of currently-unlocked object");
} else {
log_trace(biasedlocking)(" Revoked bias of currently-unlocked object");
}
if (allow_rebias) {
obj->set_mark(biased_prototype);
@ -326,12 +353,12 @@ static BiasedLocking::Condition bulk_revoke_or_rebias_at_safepoint(oop o,
JavaThread* requesting_thread) {
assert(SafepointSynchronize::is_at_safepoint(), "must be done at safepoint");
if (TraceBiasedLocking) {
tty->print_cr("* Beginning bulk revocation (kind == %s) because of object "
INTPTR_FORMAT " , mark " INTPTR_FORMAT " , type %s",
(bulk_rebias ? "rebias" : "revoke"),
p2i((void *) o), (intptr_t) o->mark(), o->klass()->external_name());
}
log_info(biasedlocking)("* Beginning bulk revocation (kind == %s) because of object "
INTPTR_FORMAT " , mark " INTPTR_FORMAT " , type %s",
(bulk_rebias ? "rebias" : "revoke"),
p2i((void *) o),
(intptr_t) o->mark(),
o->klass()->external_name());
jlong cur_time = os::javaTimeMillis();
o->klass()->set_last_biased_lock_bulk_revocation_time(cur_time);
@ -377,9 +404,9 @@ static BiasedLocking::Condition bulk_revoke_or_rebias_at_safepoint(oop o,
// adjust the header of the given object to revoke its bias.
revoke_bias(o, attempt_rebias_of_object && klass->prototype_header()->has_bias_pattern(), true, requesting_thread);
} else {
if (TraceBiasedLocking) {
if (log_is_enabled(Info, biasedlocking)) {
ResourceMark rm;
tty->print_cr("* Disabling biased locking for type %s", klass->external_name());
log_info(biasedlocking)("* Disabling biased locking for type %s", klass->external_name());
}
// Disable biased locking for this data type. Not only will this
@ -407,9 +434,7 @@ static BiasedLocking::Condition bulk_revoke_or_rebias_at_safepoint(oop o,
revoke_bias(o, false, true, requesting_thread);
}
if (TraceBiasedLocking) {
tty->print_cr("* Ending bulk revocation");
}
log_info(biasedlocking)("* Ending bulk revocation");
BiasedLocking::Condition status_code = BiasedLocking::BIAS_REVOKED;
@ -420,9 +445,7 @@ static BiasedLocking::Condition bulk_revoke_or_rebias_at_safepoint(oop o,
klass->prototype_header()->bias_epoch());
o->set_mark(new_mark);
status_code = BiasedLocking::BIAS_REVOKED_AND_REBIASED;
if (TraceBiasedLocking) {
tty->print_cr(" Rebiased object toward thread " INTPTR_FORMAT, (intptr_t) requesting_thread);
}
log_info(biasedlocking)(" Rebiased object toward thread " INTPTR_FORMAT, (intptr_t) requesting_thread);
}
assert(!o->mark()->has_bias_pattern() ||
@ -485,16 +508,12 @@ public:
virtual void doit() {
if (_obj != NULL) {
if (TraceBiasedLocking) {
tty->print_cr("Revoking bias with potentially per-thread safepoint:");
}
log_info(biasedlocking)("Revoking bias with potentially per-thread safepoint:");
_status_code = revoke_bias((*_obj)(), false, false, _requesting_thread);
clean_up_cached_monitor_info();
return;
} else {
if (TraceBiasedLocking) {
tty->print_cr("Revoking bias with global safepoint:");
}
log_info(biasedlocking)("Revoking bias with global safepoint:");
BiasedLocking::revoke_at_safepoint(_objs);
}
}
@ -608,9 +627,7 @@ BiasedLocking::Condition BiasedLocking::revoke_and_rebias(Handle obj, bool attem
// can come in with a CAS to steal the bias of an object that has a
// stale epoch.
ResourceMark rm;
if (TraceBiasedLocking) {
tty->print_cr("Revoking bias by walking my own stack:");
}
log_info(biasedlocking)("Revoking bias by walking my own stack:");
BiasedLocking::Condition cond = revoke_bias(obj(), false, false, (JavaThread*) THREAD);
((JavaThread*) THREAD)->set_cached_monitor_info(NULL);
assert(cond == BIAS_REVOKED, "why not?");

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

@ -1488,9 +1488,6 @@ public:
develop(bool, TraceClearedExceptions, false, \
"Print when an exception is forcibly cleared") \
\
product(bool, TraceBiasedLocking, false, \
"Trace biased locking in JVM") \
\
/* gc */ \
\
product(bool, UseSerialGC, false, \

9
hotspot/src/share/vm/runtime/thread.cpp
View file

@ -170,11 +170,10 @@ void* Thread::allocate(size_t size, bool throw_excpt, MEMFLAGS flags) {
assert(((uintptr_t) aligned_addr + (uintptr_t) size) <=
((uintptr_t) real_malloc_addr + (uintptr_t) aligned_size),
"JavaThread alignment code overflowed allocated storage");
if (TraceBiasedLocking) {
if (aligned_addr != real_malloc_addr) {
tty->print_cr("Aligned thread " INTPTR_FORMAT " to " INTPTR_FORMAT,
p2i(real_malloc_addr), p2i(aligned_addr));
}
if (aligned_addr != real_malloc_addr) {
log_info(biasedlocking)("Aligned thread " INTPTR_FORMAT " to " INTPTR_FORMAT,
p2i(real_malloc_addr),
p2i(aligned_addr));
}
((Thread*) aligned_addr)->_real_malloc_address = real_malloc_addr;
return aligned_addr;