/* * Copyright (c) 1998, 2007, 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 * under the terms of the GNU General Public License version 2 only, as * published by the Free Software Foundation. Oracle designates this * particular file as subject to the "Classpath" exception as provided * by Oracle in the LICENSE file that accompanied this code. * * This code is distributed in the hope that it will be useful, but WITHOUT * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License * version 2 for more details (a copy is included in the LICENSE file that * accompanied this code). * * You should have received a copy of the GNU General Public License version * 2 along with this work; if not, write to the Free Software Foundation, * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA. * * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA * or visit www.oracle.com if you need additional information or have any * questions. */ #include "ergo.h" static unsigned long physical_processors(void); #ifdef __solaris__ /* * A utility method for asking the CPU about itself. * There's a corresponding version of linux-i586 * because the compilers are different. */ static void get_cpuid(uint32_t arg, uint32_t* eaxp, uint32_t* ebxp, uint32_t* ecxp, uint32_t* edxp) { #ifdef _LP64 asm( /* rbx is a callee-saved register */ " movq %rbx, %r11 \n" /* rdx and rcx are 3rd and 4th argument registers */ " movq %rdx, %r10 \n" " movq %rcx, %r9 \n" " movl %edi, %eax \n" " cpuid \n" " movl %eax, (%rsi)\n" " movl %ebx, (%r10)\n" " movl %ecx, (%r9) \n" " movl %edx, (%r8) \n" /* Restore rbx */ " movq %r11, %rbx"); #else /* EBX is a callee-saved register */ asm(" pushl %ebx"); /* Need ESI for storing through arguments */ asm(" pushl %esi"); asm(" movl 8(%ebp), %eax \n" " cpuid \n" " movl 12(%ebp), %esi \n" " movl %eax, (%esi) \n" " movl 16(%ebp), %esi \n" " movl %ebx, (%esi) \n" " movl 20(%ebp), %esi \n" " movl %ecx, (%esi) \n" " movl 24(%ebp), %esi \n" " movl %edx, (%esi) "); /* Restore ESI and EBX */ asm(" popl %esi"); /* Restore EBX */ asm(" popl %ebx"); #endif /* LP64 */ } /* The definition of a server-class machine for solaris-i586/amd64 */ jboolean ServerClassMachineImpl(void) { jboolean result = JNI_FALSE; /* How big is a server class machine? */ const unsigned long server_processors = 2UL; const uint64_t server_memory = 2UL * GB; /* * We seem not to get our full complement of memory. * We allow some part (1/8?) of the memory to be "missing", * based on the sizes of DIMMs, and maybe graphics cards. */ const uint64_t missing_memory = 256UL * MB; const uint64_t actual_memory = physical_memory(); /* Is this a server class machine? */ if (actual_memory >= (server_memory - missing_memory)) { const unsigned long actual_processors = physical_processors(); if (actual_processors >= server_processors) { result = JNI_TRUE; } } JLI_TraceLauncher("solaris_" LIBARCHNAME "_ServerClassMachine: %s\n", (result == JNI_TRUE ? "true" : "false")); return result; } #endif /* __solaris__ */ #ifdef __linux__ /* * A utility method for asking the CPU about itself. * There's a corresponding version of solaris-i586 * because the compilers are different. */ static void get_cpuid(uint32_t arg, uint32_t* eaxp, uint32_t* ebxp, uint32_t* ecxp, uint32_t* edxp) { #ifdef _LP64 __asm__ volatile (/* Instructions */ " movl %4, %%eax \n" " cpuid \n" " movl %%eax, (%0)\n" " movl %%ebx, (%1)\n" " movl %%ecx, (%2)\n" " movl %%edx, (%3)\n" : /* Outputs */ : /* Inputs */ "r" (eaxp), "r" (ebxp), "r" (ecxp), "r" (edxp), "r" (arg) : /* Clobbers */ "%rax", "%rbx", "%rcx", "%rdx", "memory" ); #else /* _LP64 */ uint32_t value_of_eax = 0; uint32_t value_of_ebx = 0; uint32_t value_of_ecx = 0; uint32_t value_of_edx = 0; __asm__ volatile (/* Instructions */ /* ebx is callee-save, so push it */ " pushl %%ebx \n" " movl %4, %%eax \n" " cpuid \n" " movl %%eax, %0 \n" " movl %%ebx, %1 \n" " movl %%ecx, %2 \n" " movl %%edx, %3 \n" /* restore ebx */ " popl %%ebx \n" : /* Outputs */ "=m" (value_of_eax), "=m" (value_of_ebx), "=m" (value_of_ecx), "=m" (value_of_edx) : /* Inputs */ "m" (arg) : /* Clobbers */ "%eax", "%ecx", "%edx" ); *eaxp = value_of_eax; *ebxp = value_of_ebx; *ecxp = value_of_ecx; *edxp = value_of_edx; #endif /* _LP64 */ } /* The definition of a server-class machine for linux-i586 */ jboolean ServerClassMachineImpl(void) { jboolean result = JNI_FALSE; /* How big is a server class machine? */ const unsigned long server_processors = 2UL; const uint64_t server_memory = 2UL * GB; /* * We seem not to get our full complement of memory. * We allow some part (1/8?) of the memory to be "missing", * based on the sizes of DIMMs, and maybe graphics cards. */ const uint64_t missing_memory = 256UL * MB; const uint64_t actual_memory = physical_memory(); /* Is this a server class machine? */ if (actual_memory >= (server_memory - missing_memory)) { const unsigned long actual_processors = physical_processors(); if (actual_processors >= server_processors) { result = JNI_TRUE; } } JLI_TraceLauncher("linux_" LIBARCHNAME "_ServerClassMachine: %s\n", (result == JNI_TRUE ? "true" : "false")); return result; } #endif /* __linux__ */ /* * Routines shared by solaris-i586 and linux-i586. */ enum HyperThreadingSupport_enum { hts_supported = 1, hts_too_soon_to_tell = 0, hts_not_supported = -1, hts_not_pentium4 = -2, hts_not_intel = -3 }; typedef enum HyperThreadingSupport_enum HyperThreadingSupport; /* Determine if hyperthreading is supported */ static HyperThreadingSupport hyperthreading_support(void) { HyperThreadingSupport result = hts_too_soon_to_tell; /* Bits 11 through 8 is family processor id */ # define FAMILY_ID_SHIFT 8 # define FAMILY_ID_MASK 0xf /* Bits 23 through 20 is extended family processor id */ # define EXT_FAMILY_ID_SHIFT 20 # define EXT_FAMILY_ID_MASK 0xf /* Pentium 4 family processor id */ # define PENTIUM4_FAMILY_ID 0xf /* Bit 28 indicates Hyper-Threading Technology support */ # define HT_BIT_SHIFT 28 # define HT_BIT_MASK 1 uint32_t vendor_id[3] = { 0U, 0U, 0U }; uint32_t value_of_eax = 0U; uint32_t value_of_edx = 0U; uint32_t dummy = 0U; /* Yes, this is supposed to be [0], [2], [1] */ get_cpuid(0, &dummy, &vendor_id[0], &vendor_id[2], &vendor_id[1]); JLI_TraceLauncher("vendor: %c %c %c %c %c %c %c %c %c %c %c %c \n", ((vendor_id[0] >> 0) & 0xff), ((vendor_id[0] >> 8) & 0xff), ((vendor_id[0] >> 16) & 0xff), ((vendor_id[0] >> 24) & 0xff), ((vendor_id[1] >> 0) & 0xff), ((vendor_id[1] >> 8) & 0xff), ((vendor_id[1] >> 16) & 0xff), ((vendor_id[1] >> 24) & 0xff), ((vendor_id[2] >> 0) & 0xff), ((vendor_id[2] >> 8) & 0xff), ((vendor_id[2] >> 16) & 0xff), ((vendor_id[2] >> 24) & 0xff)); get_cpuid(1, &value_of_eax, &dummy, &dummy, &value_of_edx); JLI_TraceLauncher("value_of_eax: 0x%x value_of_edx: 0x%x\n", value_of_eax, value_of_edx); if ((((value_of_eax >> FAMILY_ID_SHIFT) & FAMILY_ID_MASK) == PENTIUM4_FAMILY_ID) || (((value_of_eax >> EXT_FAMILY_ID_SHIFT) & EXT_FAMILY_ID_MASK) != 0)) { if ((((vendor_id[0] >> 0) & 0xff) == 'G') && (((vendor_id[0] >> 8) & 0xff) == 'e') && (((vendor_id[0] >> 16) & 0xff) == 'n') && (((vendor_id[0] >> 24) & 0xff) == 'u') && (((vendor_id[1] >> 0) & 0xff) == 'i') && (((vendor_id[1] >> 8) & 0xff) == 'n') && (((vendor_id[1] >> 16) & 0xff) == 'e') && (((vendor_id[1] >> 24) & 0xff) == 'I') && (((vendor_id[2] >> 0) & 0xff) == 'n') && (((vendor_id[2] >> 8) & 0xff) == 't') && (((vendor_id[2] >> 16) & 0xff) == 'e') && (((vendor_id[2] >> 24) & 0xff) == 'l')) { if (((value_of_edx >> HT_BIT_SHIFT) & HT_BIT_MASK) == HT_BIT_MASK) { JLI_TraceLauncher("Hyperthreading supported\n"); result = hts_supported; } else { JLI_TraceLauncher("Hyperthreading not supported\n"); result = hts_not_supported; } } else { JLI_TraceLauncher("Not GenuineIntel\n"); result = hts_not_intel; } } else { JLI_TraceLauncher("not Pentium 4 or extended\n"); result = hts_not_pentium4; } return result; } /* Determine how many logical processors there are per CPU */ static unsigned int logical_processors_per_package(void) { /* * After CPUID with EAX==1, register EBX bits 23 through 16 * indicate the number of logical processors per package */ # define NUM_LOGICAL_SHIFT 16 # define NUM_LOGICAL_MASK 0xff unsigned int result = 1U; const HyperThreadingSupport hyperthreading = hyperthreading_support(); if (hyperthreading == hts_supported) { uint32_t value_of_ebx = 0U; uint32_t dummy = 0U; get_cpuid(1, &dummy, &value_of_ebx, &dummy, &dummy); result = (value_of_ebx >> NUM_LOGICAL_SHIFT) & NUM_LOGICAL_MASK; JLI_TraceLauncher("logical processors per package: %u\n", result); } return result; } /* Compute the number of physical processors, not logical processors */ static unsigned long physical_processors(void) { const long sys_processors = sysconf(_SC_NPROCESSORS_CONF); unsigned long result = sys_processors; JLI_TraceLauncher("sysconf(_SC_NPROCESSORS_CONF): %lu\n", sys_processors); if (sys_processors > 1) { unsigned int logical_processors = logical_processors_per_package(); if (logical_processors > 1) { result = (unsigned long) sys_processors / logical_processors; } } JLI_TraceLauncher("physical processors: %lu\n", result); return result; }