/* $Id: bs3-memalloc-1.c64 93603 2022-02-04 14:11:42Z vboxsync $ */ /** @file * BS3Kit - bs3-timers-1, 64-bit C code. */ /* * Copyright (C) 2021-2022 Oracle Corporation * * This file is part of VirtualBox Open Source Edition (OSE), as * available from http://www.virtualbox.org. This file is free software; * you can redistribute it and/or modify it under the terms of the GNU * General Public License (GPL) as published by the Free Software * Foundation, in version 2 as it comes in the "COPYING" file of the * VirtualBox OSE distribution. VirtualBox OSE is distributed in the * hope that it will be useful, but WITHOUT ANY WARRANTY of any kind. * * The contents of this file may alternatively be used under the terms * of the Common Development and Distribution License Version 1.0 * (CDDL) only, as it comes in the "COPYING.CDDL" file of the * VirtualBox OSE distribution, in which case the provisions of the * CDDL are applicable instead of those of the GPL. * * You may elect to license modified versions of this file under the * terms and conditions of either the GPL or the CDDL or both. */ /********************************************************************************************************************************* * Header Files * *********************************************************************************************************************************/ #include #include #include /********************************************************************************************************************************* * Global Variables * *********************************************************************************************************************************/ /** Copy of interesting E820 entries. */ static INT15E820ENTRY g_aEntries[16]; /** Number of interesting entires. */ static unsigned g_cEntries = 0; /** Number of intersting bytes found. */ static uint64_t g_cbInteresting = 0; /** Lowest interesting address. */ static uint64_t g_uInterestingStart = UINT64_MAX; /** End of interesting addresses. */ static uint64_t g_uInterestingEnd = 0; /** * For subsequence touch iterations that doesn't allocate any RAM. * * This may cause page pool activitiy if we've got more memory than we have room * for in the pool. This depends on amount of guest RAM and how much could be * backed by large pages. */ static uint64_t CheckTouchedMemory(void) { unsigned iEntry; uint64_t iPage = 0; uint64_t cErrors = 0; for (iEntry = 0; iEntry < g_cEntries; iEntry++) { uint64_t volatile *pu64Cur = (uint64_t *)g_aEntries[iEntry].uBaseAddr; uint64_t cbLeft = g_aEntries[iEntry].cbRange; while (cbLeft >= X86_PAGE_SIZE) { /* Check first. */ if (RT_LIKELY( pu64Cur[0] == iPage && pu64Cur[1] == iPage)) { /* likely */ } else { Bs3TestFailedF("%p: %#llx + %#llx, expected twice %#llx\n", pu64Cur, pu64Cur[0], pu64Cur[1], iPage); cErrors++; } /* Then write again. */ pu64Cur[0] = iPage; pu64Cur[1] = iPage; /* Advance. */ iPage++; pu64Cur += X86_PAGE_SIZE / sizeof(*pu64Cur); cbLeft -= X86_PAGE_SIZE; } } return cErrors; } /** * First touching of memory, assuming content is ZERO. */ static uint64_t FirstTouchMemory(void) { unsigned iEntry; uint64_t iPage = 0; for (iEntry = 0; iEntry < g_cEntries; iEntry++) { uint64_t volatile *pu64Cur = (uint64_t volatile *)g_aEntries[iEntry].uBaseAddr; uint64_t cbLeft = g_aEntries[iEntry].cbRange; while (cbLeft >= X86_PAGE_SIZE) { /* * Write to the page first so we won't waste time mapping the zero * page and get straight to the actual page allocation. */ pu64Cur[0] = iPage; /* Then check that the 2nd qword is zero before writing it. */ if (RT_LIKELY(pu64Cur[1] == 0)) { /* likely */ } else Bs3TestFailedF("%p: %#llx, expected zero\n", pu64Cur, pu64Cur[1]); pu64Cur[1] = iPage; /* Advance. */ iPage++; pu64Cur += X86_PAGE_SIZE / sizeof(*pu64Cur); cbLeft -= X86_PAGE_SIZE; } } return iPage; } /** * Translates a E820 entry type to a string. */ static const char *getEntryTypeName(uint32_t uType) { switch (uType) { case INT15E820_TYPE_USABLE: return "USABLE"; case INT15E820_TYPE_RESERVED: return "RESERVED"; case INT15E820_TYPE_ACPI_RECLAIMABLE: return "ACPI_RECLAIMABLE"; case INT15E820_TYPE_ACPI_NVS: return "ACPI_NVS"; case INT15E820_TYPE_BAD: return "BAD"; default: return "unknown"; } } BS3_DECL(void) Main_lm64() { uint32_t uCont; unsigned i; Bs3TestInit("bs3-memalloc-1"); /* * Get the E820 memory descriptors and pick out those describing memory not * already used by the Bs3Kit. */ Bs3TestSub("INT15h/E820"); for (uCont = i = 0; i < 2048; i++) { uint32_t const uEbxCur = uCont; INT15E820ENTRY Entry = { 0, 0, 0, 0 }; uint32_t cbEntry = sizeof(Entry); if (!Bs3BiosInt15hE820_lm64(&Entry, &cbEntry, &uCont)) { Bs3TestFailedF("int15h/E820 failed i=%u", i); break; } Bs3TestPrintf("#%u/%#x: %#018llx LB %#018llx %s (%d)\n", i, uEbxCur, Entry.uBaseAddr, Entry.cbRange, getEntryTypeName(Entry.uType), Entry.uType); if (Entry.uType == INT15E820_TYPE_USABLE) { if (Entry.uBaseAddr >= _4G) { if (g_cEntries < RT_ELEMENTS(g_aEntries)) { g_cbInteresting += Entry.cbRange; if (g_uInterestingStart > Entry.uBaseAddr) g_uInterestingStart = Entry.uBaseAddr; if (g_uInterestingEnd < Entry.uBaseAddr + Entry.cbRange) g_uInterestingEnd = Entry.uBaseAddr + Entry.cbRange; Bs3MemCpy(&g_aEntries[g_cEntries++], &Entry, sizeof(Entry)); } else Bs3TestFailedF("Too many interesting E820 entries! Extend g_aEntries!\n"); } } /* Done? */ if (uCont == 0) break; } if (g_cEntries == 0) Bs3TestFailedF("No interesting E820 entries! Make sure you've assigned more than 4GB to the VM!\n"); else { uint64_t uFailurePoint = 0; int rc; Bs3TestPrintf("Found %u interesting entries covering %#llx bytes (%u GB).\n" "From %#llx to %#llx\n", g_cEntries, g_cbInteresting, (unsigned)(g_cbInteresting / _1G), g_uInterestingStart, g_uInterestingEnd); if (g_uBs3EndOfRamAbove4G < g_uInterestingEnd) Bs3TestFailedF("g_uBs3EndOfRamAbove4G (%#llx) is lower than g_uInterestingEnd (%#llx)!\n", g_uBs3EndOfRamAbove4G, g_uInterestingEnd); /* * Map all the memory (Bs3Kit only maps memory below 4G). */ Bs3TestSub("Mapping memory above 4GB"); if (!(g_uBs3CpuDetected & BS3CPU_F_PSE)) Bs3TestFailedF("PSE was not detected!\n"); else if (!(ASMGetCR4() & X86_CR4_PSE)) Bs3TestFailedF("PSE was not enabled!\n"); else if (RT_SUCCESS(rc = Bs3PagingMapRamAbove4GForLM(&uFailurePoint))) { #define PAGES_2_MB(a_cPages) ((a_cPages) / (_1M / X86_PAGE_SIZE)) uint64_t cTotalPages; unsigned iLoop; /* * Time touching all the memory. */ Bs3TestSub("Allocation speed"); { uint64_t const nsStart = Bs3TestNow(); uint64_t const uTscStart = ASMReadTSC(); uint64_t const cPages = FirstTouchMemory(); uint64_t const cTicksElapsed = ASMReadTSC() - uTscStart; uint64_t const cNsElapsed = Bs3TestNow() - nsStart; uint64_t uThruput; Bs3TestValue("Pages", cPages, VMMDEV_TESTING_UNIT_PAGES); Bs3TestValue("MiBs", PAGES_2_MB(cPages), VMMDEV_TESTING_UNIT_MEGABYTES); Bs3TestValue("Alloc elapsed", cNsElapsed, VMMDEV_TESTING_UNIT_NS); Bs3TestValue("Alloc elapsed in ticks", cTicksElapsed, VMMDEV_TESTING_UNIT_TICKS); Bs3TestValue("Page alloc time", cNsElapsed / cPages, VMMDEV_TESTING_UNIT_NS_PER_PAGE); Bs3TestValue("Page alloc time in ticks", cTicksElapsed / cPages, VMMDEV_TESTING_UNIT_TICKS_PER_PAGE); uThruput = cPages * RT_NS_1SEC / cNsElapsed; Bs3TestValue("Alloc thruput", uThruput, VMMDEV_TESTING_UNIT_PAGES_PER_SEC); Bs3TestValue("Alloc thruput in MiBs", PAGES_2_MB(uThruput), VMMDEV_TESTING_UNIT_MEGABYTES_PER_SEC); cTotalPages = cPages; } /* * Time accessing all the memory again. This might give a clue as to page pool performance. */ for (iLoop = 0; iLoop < 2; iLoop++) { Bs3TestSub(iLoop == 0 ? "2nd access" : "3rd access"); { uint64_t const nsStart = Bs3TestNow(); uint64_t const uTscStart = ASMReadTSC(); uint64_t const cErrors = CheckTouchedMemory(); uint64_t const cTicksElapsed = ASMReadTSC() - uTscStart; uint64_t const cNsElapsed = Bs3TestNow() - nsStart; uint64_t uThruput; Bs3TestValue("Access elapsed", cNsElapsed, VMMDEV_TESTING_UNIT_NS); Bs3TestValue("Access elapsed in ticks", cTicksElapsed, VMMDEV_TESTING_UNIT_TICKS); Bs3TestValue("Page access time", cNsElapsed / cTotalPages, VMMDEV_TESTING_UNIT_NS_PER_PAGE); Bs3TestValue("Page access time in ticks", cTicksElapsed / cTotalPages, VMMDEV_TESTING_UNIT_TICKS_PER_PAGE); uThruput = cTotalPages * RT_NS_1SEC / cNsElapsed; Bs3TestValue("Access thruput", uThruput, VMMDEV_TESTING_UNIT_PAGES_PER_SEC); Bs3TestValue("Access thruput in MiBs", PAGES_2_MB(uThruput), VMMDEV_TESTING_UNIT_MEGABYTES_PER_SEC); } } } else Bs3TestFailedF("Bs3PagingMapRamAbove4GForLM failed at %#llx: %d", uFailurePoint, rc); } Bs3TestTerm(); }