author | vlivanov |
Thu, 25 Apr 2013 11:02:32 -0700 | |
changeset 17121 | e40a97c700d9 |
parent 16605 | ba13efd453bc |
child 18943 | 7d0ef675e808 |
permissions | -rw-r--r-- |
8119 | 1 |
/* |
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* Copyright (c) 1999, 2012, Oracle and/or its affiliates. All rights reserved. |
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* DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER. |
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* |
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* This code is free software; you can redistribute it and/or modify it |
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* under the terms of the GNU General Public License version 2 only, as |
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* published by the Free Software Foundation. |
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* |
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* This code is distributed in the hope that it will be useful, but WITHOUT |
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* ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or |
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* FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License |
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* version 2 for more details (a copy is included in the LICENSE file that |
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* accompanied this code). |
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* |
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* You should have received a copy of the GNU General Public License version |
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* 2 along with this work; if not, write to the Free Software Foundation, |
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* Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA. |
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* |
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* Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA |
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* or visit www.oracle.com if you need additional information or have any |
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* questions. |
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* |
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*/ |
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||
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#include "prims/jvm.h" |
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#include "runtime/frame.inline.hpp" |
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#include "runtime/os.hpp" |
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#include "utilities/vmError.hpp" |
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#include <unistd.h> |
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#include <sys/resource.h> |
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#include <sys/utsname.h> |
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// Check core dump limit and report possible place where core can be found |
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void os::check_or_create_dump(void* exceptionRecord, void* contextRecord, char* buffer, size_t bufferSize) { |
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int n; |
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struct rlimit rlim; |
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bool success; |
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n = get_core_path(buffer, bufferSize); |
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if (getrlimit(RLIMIT_CORE, &rlim) != 0) { |
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jio_snprintf(buffer + n, bufferSize - n, "/core or core.%d (may not exist)", current_process_id()); |
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success = true; |
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} else { |
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switch(rlim.rlim_cur) { |
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case RLIM_INFINITY: |
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jio_snprintf(buffer + n, bufferSize - n, "/core or core.%d", current_process_id()); |
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success = true; |
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break; |
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case 0: |
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jio_snprintf(buffer, bufferSize, "Core dumps have been disabled. To enable core dumping, try \"ulimit -c unlimited\" before starting Java again"); |
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success = false; |
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break; |
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default: |
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jio_snprintf(buffer + n, bufferSize - n, "/core or core.%d (max size %lu kB). To ensure a full core dump, try \"ulimit -c unlimited\" before starting Java again", current_process_id(), (unsigned long)(rlim.rlim_cur >> 10)); |
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success = true; |
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break; |
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} |
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} |
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VMError::report_coredump_status(buffer, success); |
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} |
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address os::get_caller_pc(int n) { |
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#ifdef _NMT_NOINLINE_ |
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n ++; |
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#endif |
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frame fr = os::current_frame(); |
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while (n > 0 && fr.pc() && |
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!os::is_first_C_frame(&fr) && fr.sender_pc()) { |
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fr = os::get_sender_for_C_frame(&fr); |
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n --; |
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} |
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if (n == 0) { |
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return fr.pc(); |
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} else { |
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return NULL; |
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} |
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} |
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int os::get_last_error() { |
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return errno; |
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} |
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bool os::is_debugger_attached() { |
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// not implemented |
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return false; |
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} |
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void os::wait_for_keypress_at_exit(void) { |
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// don't do anything on posix platforms |
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return; |
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} |
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// Multiple threads can race in this code, and can remap over each other with MAP_FIXED, |
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// so on posix, unmap the section at the start and at the end of the chunk that we mapped |
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// rather than unmapping and remapping the whole chunk to get requested alignment. |
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char* os::reserve_memory_aligned(size_t size, size_t alignment) { |
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assert((alignment & (os::vm_allocation_granularity() - 1)) == 0, |
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"Alignment must be a multiple of allocation granularity (page size)"); |
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assert((size & (alignment -1)) == 0, "size must be 'alignment' aligned"); |
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size_t extra_size = size + alignment; |
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assert(extra_size >= size, "overflow, size is too large to allow alignment"); |
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char* extra_base = os::reserve_memory(extra_size, NULL, alignment); |
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if (extra_base == NULL) { |
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return NULL; |
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} |
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// Do manual alignment |
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char* aligned_base = (char*) align_size_up((uintptr_t) extra_base, alignment); |
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// [ | | ] |
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// ^ extra_base |
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// ^ extra_base + begin_offset == aligned_base |
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// extra_base + begin_offset + size ^ |
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// extra_base + extra_size ^ |
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// |<>| == begin_offset |
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// end_offset == |<>| |
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size_t begin_offset = aligned_base - extra_base; |
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size_t end_offset = (extra_base + extra_size) - (aligned_base + size); |
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if (begin_offset > 0) { |
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os::release_memory(extra_base, begin_offset); |
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} |
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if (end_offset > 0) { |
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os::release_memory(extra_base + begin_offset + size, end_offset); |
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} |
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return aligned_base; |
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} |
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void os::Posix::print_load_average(outputStream* st) { |
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st->print("load average:"); |
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double loadavg[3]; |
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os::loadavg(loadavg, 3); |
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st->print("%0.02f %0.02f %0.02f", loadavg[0], loadavg[1], loadavg[2]); |
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st->cr(); |
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} |
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void os::Posix::print_rlimit_info(outputStream* st) { |
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st->print("rlimit:"); |
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struct rlimit rlim; |
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st->print(" STACK "); |
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getrlimit(RLIMIT_STACK, &rlim); |
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if (rlim.rlim_cur == RLIM_INFINITY) st->print("infinity"); |
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else st->print("%uk", rlim.rlim_cur >> 10); |
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st->print(", CORE "); |
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getrlimit(RLIMIT_CORE, &rlim); |
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if (rlim.rlim_cur == RLIM_INFINITY) st->print("infinity"); |
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else st->print("%uk", rlim.rlim_cur >> 10); |
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//Isn't there on solaris |
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#ifndef TARGET_OS_FAMILY_solaris |
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st->print(", NPROC "); |
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getrlimit(RLIMIT_NPROC, &rlim); |
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if (rlim.rlim_cur == RLIM_INFINITY) st->print("infinity"); |
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else st->print("%d", rlim.rlim_cur); |
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#endif |
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|
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st->print(", NOFILE "); |
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getrlimit(RLIMIT_NOFILE, &rlim); |
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if (rlim.rlim_cur == RLIM_INFINITY) st->print("infinity"); |
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else st->print("%d", rlim.rlim_cur); |
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st->print(", AS "); |
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getrlimit(RLIMIT_AS, &rlim); |
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if (rlim.rlim_cur == RLIM_INFINITY) st->print("infinity"); |
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else st->print("%uk", rlim.rlim_cur >> 10); |
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st->cr(); |
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} |
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|
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void os::Posix::print_uname_info(outputStream* st) { |
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// kernel |
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st->print("uname:"); |
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struct utsname name; |
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uname(&name); |
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st->print(name.sysname); st->print(" "); |
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st->print(name.release); st->print(" "); |
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st->print(name.version); st->print(" "); |
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st->print(name.machine); |
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st->cr(); |
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189 |
} |
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190 |
|
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bool os::has_allocatable_memory_limit(julong* limit) { |
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struct rlimit rlim; |
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int getrlimit_res = getrlimit(RLIMIT_AS, &rlim); |
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// if there was an error when calling getrlimit, assume that there is no limitation |
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// on virtual memory. |
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bool result; |
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if ((getrlimit_res != 0) || (rlim.rlim_cur == RLIM_INFINITY)) { |
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result = false; |
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} else { |
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*limit = (julong)rlim.rlim_cur; |
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result = true; |
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202 |
} |
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203 |
#ifdef _LP64 |
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return result; |
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205 |
#else |
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// arbitrary virtual space limit for 32 bit Unices found by testing. If |
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// getrlimit above returned a limit, bound it with this limit. Otherwise |
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// directly use it. |
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209 |
const julong max_virtual_limit = (julong)3800*M; |
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if (result) { |
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*limit = MIN2(*limit, max_virtual_limit); |
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212 |
} else { |
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*limit = max_virtual_limit; |
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214 |
} |
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215 |
|
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// bound by actually allocatable memory. The algorithm uses two bounds, an |
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// upper and a lower limit. The upper limit is the current highest amount of |
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// memory that could not be allocated, the lower limit is the current highest |
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// amount of memory that could be allocated. |
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// The algorithm iteratively refines the result by halving the difference |
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// between these limits, updating either the upper limit (if that value could |
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// not be allocated) or the lower limit (if the that value could be allocated) |
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// until the difference between these limits is "small". |
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224 |
|
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225 |
// the minimum amount of memory we care about allocating. |
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const julong min_allocation_size = M; |
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227 |
|
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julong upper_limit = *limit; |
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229 |
|
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230 |
// first check a few trivial cases |
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231 |
if (is_allocatable(upper_limit) || (upper_limit <= min_allocation_size)) { |
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232 |
*limit = upper_limit; |
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233 |
} else if (!is_allocatable(min_allocation_size)) { |
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// we found that not even min_allocation_size is allocatable. Return it |
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235 |
// anyway. There is no point to search for a better value any more. |
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*limit = min_allocation_size; |
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237 |
} else { |
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238 |
// perform the binary search. |
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239 |
julong lower_limit = min_allocation_size; |
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240 |
while ((upper_limit - lower_limit) > min_allocation_size) { |
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241 |
julong temp_limit = ((upper_limit - lower_limit) / 2) + lower_limit; |
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242 |
temp_limit = align_size_down_(temp_limit, min_allocation_size); |
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243 |
if (is_allocatable(temp_limit)) { |
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244 |
lower_limit = temp_limit; |
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245 |
} else { |
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246 |
upper_limit = temp_limit; |
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247 |
} |
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248 |
} |
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249 |
*limit = lower_limit; |
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250 |
} |
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251 |
return true; |
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252 |
#endif |
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253 |
} |
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254 |
|
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255 |
const char* os::get_current_directory(char *buf, size_t buflen) { |
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256 |
return getcwd(buf, buflen); |
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257 |
} |
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258 |
|
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259 |
FILE* os::open(int fd, const char* mode) { |
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260 |
return ::fdopen(fd, mode); |
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261 |
} |