Mercurial > hg > truffle
annotate src/os_cpu/linux_sparc/vm/thread_linux_sparc.cpp @ 4837:eff609af17d7
7127706: G1: re-enable survivors during the initial-mark pause
Summary: Re-enable survivors during the initial-mark pause. Afterwards, the concurrent marking threads have to scan them and mark everything reachable from them. The next GC will have to wait for the survivors to be scanned.
Reviewed-by: brutisso, johnc
| author | tonyp |
|---|---|
| date | Wed, 25 Jan 2012 12:58:23 -0500 |
| parents | f95d63e2154a |
| children | f34d701e952e |
| rev | line source |
|---|---|
| 133 | 1 /* |
| 1972 | 2 * Copyright (c) 2003, 2010, Oracle and/or its affiliates. All rights reserved. |
| 133 | 3 * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER. |
| 4 * | |
| 5 * This code is free software; you can redistribute it and/or modify it | |
| 6 * under the terms of the GNU General Public License version 2 only, as | |
| 7 * published by the Free Software Foundation. | |
| 8 * | |
| 9 * This code is distributed in the hope that it will be useful, but WITHOUT | |
| 10 * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or | |
| 11 * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License | |
| 12 * version 2 for more details (a copy is included in the LICENSE file that | |
| 13 * accompanied this code). | |
| 14 * | |
| 15 * You should have received a copy of the GNU General Public License version | |
| 16 * 2 along with this work; if not, write to the Free Software Foundation, | |
| 17 * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA. | |
| 18 * | |
|
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19 * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA |
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20 * or visit www.oracle.com if you need additional information or have any |
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21 * questions. |
| 133 | 22 * |
| 23 */ | |
| 24 | |
| 1972 | 25 #include "precompiled.hpp" |
| 26 #include "runtime/frame.inline.hpp" | |
| 27 #include "thread_linux.inline.hpp" | |
| 133 | 28 |
| 29 // For Forte Analyzer AsyncGetCallTrace profiling support - thread is | |
| 30 // currently interrupted by SIGPROF | |
| 31 bool JavaThread::pd_get_top_frame_for_signal_handler(frame* fr_addr, | |
| 32 void* ucontext, | |
| 33 bool isInJava) { | |
| 34 assert(Thread::current() == this, "caller must be current thread"); | |
| 35 assert(this->is_Java_thread(), "must be JavaThread"); | |
| 36 | |
| 37 JavaThread* jt = (JavaThread *)this; | |
| 38 | |
| 39 if (!isInJava) { | |
| 40 // make_walkable flushes register windows and grabs last_Java_pc | |
| 41 // which can not be done if the ucontext sp matches last_Java_sp | |
| 42 // stack walking utilities assume last_Java_pc set if marked flushed | |
| 43 jt->frame_anchor()->make_walkable(jt); | |
| 44 } | |
| 45 | |
| 46 // If we have a walkable last_Java_frame, then we should use it | |
| 47 // even if isInJava == true. It should be more reliable than | |
| 48 // ucontext info. | |
| 49 if (jt->has_last_Java_frame() && jt->frame_anchor()->walkable()) { | |
| 50 *fr_addr = jt->pd_last_frame(); | |
| 51 return true; | |
| 52 } | |
| 53 | |
| 54 ucontext_t* uc = (ucontext_t*) ucontext; | |
| 55 | |
| 56 // At this point, we don't have a walkable last_Java_frame, so | |
| 57 // we try to glean some information out of the ucontext. | |
| 58 intptr_t* ret_sp; | |
| 59 ExtendedPC addr = | |
| 60 os::fetch_frame_from_context(uc, &ret_sp, | |
| 61 NULL /* ret_fp only used on X86 */); | |
| 62 if (addr.pc() == NULL || ret_sp == NULL) { | |
| 63 // ucontext wasn't useful | |
| 64 return false; | |
| 65 } | |
| 66 | |
| 67 // we were running Java code when SIGPROF came in | |
| 68 if (isInJava) { | |
| 69 // If we have a last_Java_sp, then the SIGPROF signal caught us | |
| 70 // right when we were transitioning from _thread_in_Java to a new | |
| 71 // JavaThreadState. We use last_Java_sp instead of the sp from | |
| 72 // the ucontext since it should be more reliable. | |
| 73 if (jt->has_last_Java_frame()) { | |
| 74 ret_sp = jt->last_Java_sp(); | |
| 75 } | |
| 76 // Implied else: we don't have a last_Java_sp so we use what we | |
| 77 // got from the ucontext. | |
| 78 | |
| 79 frame ret_frame(ret_sp, frame::unpatchable, addr.pc()); | |
| 80 if (!ret_frame.safe_for_sender(jt)) { | |
| 81 // nothing else to try if the frame isn't good | |
| 82 return false; | |
| 83 } | |
| 84 *fr_addr = ret_frame; | |
| 85 return true; | |
| 86 } | |
| 87 | |
| 88 // At this point, we know we weren't running Java code. We might | |
| 89 // have a last_Java_sp, but we don't have a walkable frame. | |
| 90 // However, we might still be able to construct something useful | |
| 91 // if the thread was running native code. | |
| 92 if (jt->has_last_Java_frame()) { | |
| 93 assert(!jt->frame_anchor()->walkable(), "case covered above"); | |
| 94 | |
| 95 if (jt->thread_state() == _thread_in_native) { | |
| 96 frame ret_frame(jt->last_Java_sp(), frame::unpatchable, addr.pc()); | |
| 97 if (!ret_frame.safe_for_sender(jt)) { | |
| 98 // nothing else to try if the frame isn't good | |
| 99 return false; | |
| 100 } | |
| 101 *fr_addr = ret_frame; | |
| 102 return true; | |
| 103 } | |
| 104 } | |
| 105 | |
| 106 // nothing else to try | |
| 107 return false; | |
| 108 } | |
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109 |
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110 void JavaThread::cache_global_variables() { } |
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111 |