author | pliden |
Tue, 12 Jun 2018 17:40:28 +0200 | |
changeset 50525 | 767cdb97f103 |
child 50875 | 2217b2fc29ea |
permissions | -rw-r--r-- |
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/* |
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* Copyright (c) 2015, 2018, 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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#include "precompiled.hpp" |
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#include "gc/z/zArray.inline.hpp" |
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#include "gc/z/zBackingFile_linux_x86.hpp" |
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#include "gc/z/zBackingPath_linux_x86.hpp" |
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#include "gc/z/zErrno.hpp" |
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#include "gc/z/zLargePages.inline.hpp" |
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#include "logging/log.hpp" |
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#include "runtime/init.hpp" |
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#include "runtime/os.hpp" |
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#include "utilities/align.hpp" |
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#include "utilities/debug.hpp" |
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#include <fcntl.h> |
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#include <sys/mman.h> |
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#include <sys/stat.h> |
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#include <sys/statfs.h> |
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#include <sys/types.h> |
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#include <unistd.h> |
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// Filesystem names |
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#define ZFILESYSTEM_TMPFS "tmpfs" |
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#define ZFILESYSTEM_HUGETLBFS "hugetlbfs" |
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// Sysfs file for transparent huge page on tmpfs |
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#define ZFILENAME_SHMEM_ENABLED "/sys/kernel/mm/transparent_hugepage/shmem_enabled" |
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// Default mount points |
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#define ZMOUNTPOINT_TMPFS "/dev/shm" |
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#define ZMOUNTPOINT_HUGETLBFS "/hugepages" |
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// Java heap filename |
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#define ZFILENAME_HEAP "java_heap" |
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// Support for building on older Linux systems |
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#ifndef __NR_memfd_create |
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#define __NR_memfd_create 319 |
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#endif |
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#ifndef MFD_CLOEXEC |
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#define MFD_CLOEXEC 0x0001U |
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#endif |
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#ifndef MFD_HUGETLB |
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#define MFD_HUGETLB 0x0004U |
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#endif |
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#ifndef O_CLOEXEC |
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#define O_CLOEXEC 02000000 |
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#endif |
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#ifndef O_TMPFILE |
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#define O_TMPFILE (020000000 | O_DIRECTORY) |
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#endif |
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// Filesystem types, see statfs(2) |
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#ifndef TMPFS_MAGIC |
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#define TMPFS_MAGIC 0x01021994 |
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#endif |
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#ifndef HUGETLBFS_MAGIC |
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#define HUGETLBFS_MAGIC 0x958458f6 |
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#endif |
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static int z_memfd_create(const char *name, unsigned int flags) { |
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return syscall(__NR_memfd_create, name, flags); |
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} |
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ZBackingFile::ZBackingFile() : |
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_fd(-1), |
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_filesystem(0), |
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_initialized(false) { |
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// Create backing file |
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_fd = create_fd(ZFILENAME_HEAP); |
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if (_fd == -1) { |
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return; |
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} |
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// Get filesystem type |
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struct statfs statfs_buf; |
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if (fstatfs(_fd, &statfs_buf) == -1) { |
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ZErrno err; |
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log_error(gc, init)("Failed to determine filesystem type for backing file (%s)", err.to_string()); |
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return; |
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} |
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_filesystem = statfs_buf.f_type; |
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// Make sure we're on a supported filesystem |
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if (!is_tmpfs() && !is_hugetlbfs()) { |
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log_error(gc, init)("Backing file must be located on a %s or a %s filesystem", ZFILESYSTEM_TMPFS, ZFILESYSTEM_HUGETLBFS); |
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return; |
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} |
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// Make sure the filesystem type matches requested large page type |
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if (ZLargePages::is_transparent() && !is_tmpfs()) { |
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log_error(gc, init)("-XX:+UseTransparentHugePages can only be enable when using a %s filesystem", ZFILESYSTEM_TMPFS); |
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return; |
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116 |
} |
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117 |
|
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if (ZLargePages::is_transparent() && !tmpfs_supports_transparent_huge_pages()) { |
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log_error(gc, init)("-XX:+UseTransparentHugePages on a %s filesystem not supported by kernel", ZFILESYSTEM_TMPFS); |
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return; |
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121 |
} |
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122 |
|
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if (ZLargePages::is_explicit() && !is_hugetlbfs()) { |
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log_error(gc, init)("-XX:+UseLargePages (without -XX:+UseTransparentHugePages) can only be enabled when using a %s filesystem", ZFILESYSTEM_HUGETLBFS); |
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return; |
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126 |
} |
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127 |
|
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if (!ZLargePages::is_explicit() && is_hugetlbfs()) { |
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log_error(gc, init)("-XX:+UseLargePages must be enabled when using a %s filesystem", ZFILESYSTEM_HUGETLBFS); |
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return; |
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131 |
} |
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132 |
|
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133 |
// Successfully initialized |
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_initialized = true; |
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} |
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136 |
|
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137 |
int ZBackingFile::create_mem_fd(const char* name) const { |
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// Create file name |
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char filename[PATH_MAX]; |
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snprintf(filename, sizeof(filename), "%s%s", name, ZLargePages::is_explicit() ? ".hugetlb" : ""); |
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141 |
|
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142 |
// Create file |
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const int extra_flags = ZLargePages::is_explicit() ? MFD_HUGETLB : 0; |
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const int fd = z_memfd_create(filename, MFD_CLOEXEC | extra_flags); |
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if (fd == -1) { |
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ZErrno err; |
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log_debug(gc, init)("Failed to create memfd file (%s)", |
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((UseLargePages && err == EINVAL) ? "Hugepages not supported" : err.to_string())); |
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return -1; |
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150 |
} |
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151 |
|
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log_debug(gc, init)("Heap backed by file /memfd:%s", filename); |
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153 |
|
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return fd; |
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155 |
} |
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156 |
|
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157 |
int ZBackingFile::create_file_fd(const char* name) const { |
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const char* const filesystem = ZLargePages::is_explicit() ? ZFILESYSTEM_HUGETLBFS : ZFILESYSTEM_TMPFS; |
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const char* const mountpoint = ZLargePages::is_explicit() ? ZMOUNTPOINT_HUGETLBFS : ZMOUNTPOINT_TMPFS; |
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160 |
|
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161 |
// Find mountpoint |
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ZBackingPath path(filesystem, mountpoint); |
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if (path.get() == NULL) { |
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log_error(gc, init)("Use -XX:ZPath to specify the path to a %s filesystem", filesystem); |
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165 |
return -1; |
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166 |
} |
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167 |
|
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168 |
// Try to create an anonymous file using the O_TMPFILE flag. Note that this |
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// flag requires kernel >= 3.11. If this fails we fall back to open/unlink. |
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const int fd_anon = open(path.get(), O_TMPFILE|O_EXCL|O_RDWR|O_CLOEXEC, S_IRUSR|S_IWUSR); |
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if (fd_anon == -1) { |
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ZErrno err; |
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log_debug(gc, init)("Failed to create anonymouns file in %s (%s)", path.get(), |
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(err == EINVAL ? "Not supported" : err.to_string())); |
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} else { |
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// Get inode number for anonymous file |
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struct stat stat_buf; |
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if (fstat(fd_anon, &stat_buf) == -1) { |
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ZErrno err; |
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log_error(gc, init)("Failed to determine inode number for anonymous file (%s)", err.to_string()); |
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return -1; |
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182 |
} |
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183 |
|
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log_debug(gc, init)("Heap backed by file %s/#" UINT64_FORMAT, path.get(), (uint64_t)stat_buf.st_ino); |
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185 |
|
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186 |
return fd_anon; |
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187 |
} |
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188 |
|
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189 |
log_debug(gc, init)("Falling back to open/unlink"); |
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190 |
|
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191 |
// Create file name |
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char filename[PATH_MAX]; |
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snprintf(filename, sizeof(filename), "%s/%s.%d", path.get(), name, os::current_process_id()); |
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194 |
|
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195 |
// Create file |
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const int fd = open(filename, O_CREAT|O_EXCL|O_RDWR|O_CLOEXEC, S_IRUSR|S_IWUSR); |
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if (fd == -1) { |
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ZErrno err; |
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log_error(gc, init)("Failed to create file %s (%s)", filename, err.to_string()); |
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200 |
return -1; |
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201 |
} |
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202 |
|
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203 |
// Unlink file |
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if (unlink(filename) == -1) { |
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ZErrno err; |
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log_error(gc, init)("Failed to unlink file %s (%s)", filename, err.to_string()); |
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return -1; |
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208 |
} |
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209 |
|
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log_debug(gc, init)("Heap backed by file %s", filename); |
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211 |
|
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return fd; |
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213 |
} |
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214 |
|
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215 |
int ZBackingFile::create_fd(const char* name) const { |
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if (ZPath == NULL) { |
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// If the path is not explicitly specified, then we first try to create a memfd file |
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// instead of looking for a tmpfd/hugetlbfs mount point. Note that memfd_create() might |
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// not be supported at all (requires kernel >= 3.17), or it might not support large |
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// pages (requires kernel >= 4.14). If memfd_create() fails, then we try to create a |
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// file on an accessible tmpfs or hugetlbfs mount point. |
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const int fd = create_mem_fd(name); |
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if (fd != -1) { |
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return fd; |
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225 |
} |
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|
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log_debug(gc, init)("Falling back to searching for an accessible moint point"); |
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} |
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|
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return create_file_fd(name); |
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} |
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|
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bool ZBackingFile::is_initialized() const { |
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return _initialized; |
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} |
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|
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int ZBackingFile::fd() const { |
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return _fd; |
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} |
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|
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bool ZBackingFile::is_tmpfs() const { |
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return _filesystem == TMPFS_MAGIC; |
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} |
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|
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bool ZBackingFile::is_hugetlbfs() const { |
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return _filesystem == HUGETLBFS_MAGIC; |
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} |
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|
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bool ZBackingFile::tmpfs_supports_transparent_huge_pages() const { |
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// If the shmem_enabled file exists and is readable then we |
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// know the kernel supports transparent huge pages for tmpfs. |
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return access(ZFILENAME_SHMEM_ENABLED, R_OK) == 0; |
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} |
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|
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bool ZBackingFile::try_split_and_expand_tmpfs(size_t offset, size_t length, size_t alignment) const { |
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// Try first smaller part. |
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const size_t offset0 = offset; |
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const size_t length0 = align_up(length / 2, alignment); |
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if (!try_expand_tmpfs(offset0, length0, alignment)) { |
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return false; |
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} |
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|
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// Try second smaller part. |
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const size_t offset1 = offset0 + length0; |
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const size_t length1 = length - length0; |
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if (!try_expand_tmpfs(offset1, length1, alignment)) { |
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return false; |
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} |
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|
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return true; |
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} |
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|
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bool ZBackingFile::try_expand_tmpfs(size_t offset, size_t length, size_t alignment) const { |
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assert(length > 0, "Invalid length"); |
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assert(is_aligned(length, alignment), "Invalid length"); |
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|
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ZErrno err = posix_fallocate(_fd, offset, length); |
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|
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if (err == EINTR && length > alignment) { |
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// Calling posix_fallocate() with a large length can take a long |
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// time to complete. When running profilers, such as VTune, this |
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// syscall will be constantly interrupted by signals. Expanding |
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// the file in smaller steps avoids this problem. |
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return try_split_and_expand_tmpfs(offset, length, alignment); |
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} |
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286 |
|
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if (err) { |
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log_error(gc)("Failed to allocate backing file (%s)", err.to_string()); |
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return false; |
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290 |
} |
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|
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return true; |
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293 |
} |
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294 |
|
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295 |
bool ZBackingFile::expand_tmpfs(size_t offset, size_t length) const { |
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assert(is_tmpfs(), "Wrong filesystem"); |
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return try_expand_tmpfs(offset, length, os::vm_page_size()); |
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} |
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299 |
|
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300 |
bool ZBackingFile::expand_hugetlbfs(size_t offset, size_t length) const { |
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301 |
assert(is_hugetlbfs(), "Wrong filesystem"); |
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|
302 |
|
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303 |
// Prior to kernel 4.3, hugetlbfs did not support posix_fallocate(). |
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// Instead of posix_fallocate() we can use a well-known workaround, |
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// which involves truncating the file to requested size and then try |
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// to map it to verify that there are enough huge pages available to |
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307 |
// back it. |
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308 |
while (ftruncate(_fd, offset + length) == -1) { |
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309 |
ZErrno err; |
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310 |
if (err != EINTR) { |
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log_error(gc)("Failed to truncate backing file (%s)", err.to_string()); |
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312 |
return false; |
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313 |
} |
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|
314 |
} |
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|
315 |
|
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316 |
// If we fail mapping during initialization, i.e. when we are pre-mapping |
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// the heap, then we wait and retry a few times before giving up. Otherwise |
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// there is a risk that running JVMs back-to-back will fail, since there |
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319 |
// is a delay between process termination and the huge pages owned by that |
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320 |
// process being returned to the huge page pool and made available for new |
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321 |
// allocations. |
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322 |
void* addr = MAP_FAILED; |
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const int max_attempts = 3; |
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324 |
for (int attempt = 1; attempt <= max_attempts; attempt++) { |
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325 |
addr = mmap(0, length, PROT_READ|PROT_WRITE, MAP_SHARED, _fd, offset); |
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326 |
if (addr != MAP_FAILED || is_init_completed()) { |
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// Mapping was successful or initialization phase has completed |
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328 |
break; |
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|
329 |
} |
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|
330 |
|
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331 |
ZErrno err; |
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332 |
log_debug(gc)("Failed to map backing file (%s), attempt %d of %d", |
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333 |
err.to_string(), attempt, max_attempts); |
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|
334 |
|
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335 |
// Wait and retry in one second, in the hope that |
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// huge pages will be available by then. |
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337 |
sleep(1); |
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338 |
} |
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|
339 |
|
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340 |
if (addr == MAP_FAILED) { |
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341 |
// Not enough huge pages left |
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ZErrno err; |
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log_error(gc)("Failed to map backing file (%s)", err.to_string()); |
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return false; |
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} |
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// Successful mapping, unmap again. From now on the pages we mapped |
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// will be reserved for this file. |
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if (munmap(addr, length) == -1) { |
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ZErrno err; |
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log_error(gc)("Failed to unmap backing file (%s)", err.to_string()); |
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return false; |
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} |
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return true; |
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} |
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|
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bool ZBackingFile::expand(size_t offset, size_t length) const { |
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return is_hugetlbfs() ? expand_hugetlbfs(offset, length) : expand_tmpfs(offset, length); |
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} |