bs3-memalloc-1.c64@ 106061

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1	/* $Id: bs3-memalloc-1.c64 106061 2024-09-16 14:03:52Z vboxsync $ */
2	/** @file
3	* BS3Kit - bs3-timers-1, 64-bit C code.
4	*/
5
6	/*
7	* Copyright (C) 2021-2024 Oracle and/or its affiliates.
8	*
9	* This file is part of VirtualBox base platform packages, as
10	* available from https://www.virtualbox.org.
11	*
12	* This program is free software; you can redistribute it and/or
13	* modify it under the terms of the GNU General Public License
14	* as published by the Free Software Foundation, in version 3 of the
15	* License.
16	*
17	* This program is distributed in the hope that it will be useful, but
18	* WITHOUT ANY WARRANTY; without even the implied warranty of
19	* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
20	* General Public License for more details.
21	*
22	* You should have received a copy of the GNU General Public License
23	* along with this program; if not, see <https://www.gnu.org/licenses>.
24	*
25	* The contents of this file may alternatively be used under the terms
26	* of the Common Development and Distribution License Version 1.0
27	* (CDDL), a copy of it is provided in the "COPYING.CDDL" file included
28	* in the VirtualBox distribution, in which case the provisions of the
29	* CDDL are applicable instead of those of the GPL.
30	*
31	* You may elect to license modified versions of this file under the
32	* terms and conditions of either the GPL or the CDDL or both.
33	*
34	* SPDX-License-Identifier: GPL-3.0-only OR CDDL-1.0
35	*/
36
37
38	/*********************************************************************************************************************************
39	* Header Files *
40	*********************************************************************************************************************************/
41	#include <bs3kit.h>
42	#include <iprt/asm-amd64-x86.h>
43	#include <VBox/VMMDevTesting.h>
44
45
46	/*********************************************************************************************************************************
47	* Global Variables *
48	*********************************************************************************************************************************/
49	/** Copy of interesting E820 entries. */
50	static INT15E820ENTRY g_aEntries[16];
51	/** Number of interesting entires. */
52	static unsigned g_cEntries = 0;
53	/** Number of intersting bytes found. */
54	static uint64_t g_cbInteresting = 0;
55	/** Lowest interesting address. */
56	static uint64_t g_uInterestingStart = UINT64_MAX;
57	/** End of interesting addresses. */
58	static uint64_t g_uInterestingEnd = 0;
59
60
61	/**
62	* For subsequence touch iterations that doesn't allocate any RAM.
63	*
64	* This may cause page pool activitiy if we've got more memory than we have room
65	* for in the pool. This depends on amount of guest RAM and how much could be
66	* backed by large pages.
67	*/
68	static uint64_t CheckTouchedMemory(void)
69	{
70	unsigned iEntry;
71	uint64_t iPage = 0;
72	uint64_t cErrors = 0;
73	for (iEntry = 0; iEntry < g_cEntries; iEntry++)
74	{
75	uint64_t volatile pu64Cur = (uint64_t )g_aEntries[iEntry].uBaseAddr;
76	uint64_t cbLeft = g_aEntries[iEntry].cbRange;
77	while (cbLeft >= X86_PAGE_SIZE)
78	{
79	/* Check first. */
80	if (RT_LIKELY( pu64Cur[0] == iPage
81	&& pu64Cur[1] == iPage))
82	{ /* likely */ }
83	else
84	{
85	Bs3TestFailedF("%p: %#llx + %#llx, expected twice %#llx\n", pu64Cur, pu64Cur[0], pu64Cur[1], iPage);
86	cErrors++;
87	}
88
89	/* Then write again. */
90	pu64Cur[0] = iPage;
91	pu64Cur[1] = iPage;
92
93	/* Advance. */
94	iPage++;
95	pu64Cur += X86_PAGE_SIZE / sizeof(*pu64Cur);
96	cbLeft -= X86_PAGE_SIZE;
97	}
98	}
99	return cErrors;
100	}
101
102
103	/**
104	* First touching of memory, assuming content is ZERO.
105	*/
106	static uint64_t FirstTouchMemory(void)
107	{
108	unsigned iEntry;
109	uint64_t iPage = 0;
110	for (iEntry = 0; iEntry < g_cEntries; iEntry++)
111	{
112	uint64_t volatile pu64Cur = (uint64_t volatile )g_aEntries[iEntry].uBaseAddr;
113	uint64_t cbLeft = g_aEntries[iEntry].cbRange;
114	while (cbLeft >= X86_PAGE_SIZE)
115	{
116	/*
117	* Write to the page first so we won't waste time mapping the zero
118	* page and get straight to the actual page allocation.
119	*/
120	pu64Cur[0] = iPage;
121
122	/* Then check that the 2nd qword is zero before writing it. */
123	if (RT_LIKELY(pu64Cur[1] == 0))
124	{ /* likely */ }
125	else
126	Bs3TestFailedF("%p: %#llx, expected zero\n", pu64Cur, pu64Cur[1]);
127	pu64Cur[1] = iPage;
128
129	/* Advance. */
130	iPage++;
131	pu64Cur += X86_PAGE_SIZE / sizeof(*pu64Cur);
132	cbLeft -= X86_PAGE_SIZE;
133	}
134	}
135	return iPage;
136	}
137
138
139	/**
140	* Translates a E820 entry type to a string.
141	*/
142	static const char *getEntryTypeName(uint32_t uType)
143	{
144	switch (uType)
145	{
146	case INT15E820_TYPE_USABLE: return "USABLE";
147	case INT15E820_TYPE_RESERVED: return "RESERVED";
148	case INT15E820_TYPE_ACPI_RECLAIMABLE: return "ACPI_RECLAIMABLE";
149	case INT15E820_TYPE_ACPI_NVS: return "ACPI_NVS";
150	case INT15E820_TYPE_BAD: return "BAD";
151	default: return "unknown";
152	}
153	}
154
155	BS3_DECL(void) Main_lm64()
156	{
157	uint32_t uCont;
158	unsigned i;
159
160	Bs3TestInit("bs3-memalloc-1");
161
162	/*
163	* Get the E820 memory descriptors and pick out those describing memory not
164	* already used by the Bs3Kit.
165	*/
166	Bs3TestSub("INT15h/E820");
167	for (uCont = i = 0; i < 2048; i++)
168	{
169	uint32_t const uEbxCur = uCont;
170	INT15E820ENTRY Entry = { 0, 0, 0, 0 };
171	uint32_t cbEntry = sizeof(Entry);
172	if (!Bs3BiosInt15hE820_lm64(&Entry, &cbEntry, &uCont))
173	{
174	Bs3TestFailedF("int15h/E820 failed i=%u", i);
175	break;
176	}
177	Bs3TestPrintf("#%u/%#x: %#018llx LB %#018llx %s (%d)\n",
178	i, uEbxCur, Entry.uBaseAddr, Entry.cbRange, getEntryTypeName(Entry.uType), Entry.uType);
179	if (Entry.uType == INT15E820_TYPE_USABLE)
180	{
181	if (Entry.uBaseAddr >= _4G)
182	{
183	if (g_cEntries < RT_ELEMENTS(g_aEntries))
184	{
185	g_cbInteresting += Entry.cbRange;
186	if (g_uInterestingStart > Entry.uBaseAddr)
187	g_uInterestingStart = Entry.uBaseAddr;
188	if (g_uInterestingEnd < Entry.uBaseAddr + Entry.cbRange)
189	g_uInterestingEnd = Entry.uBaseAddr + Entry.cbRange;
190	Bs3MemCpy(&g_aEntries[g_cEntries++], &Entry, sizeof(Entry));
191	}
192	else
193	Bs3TestFailedF("Too many interesting E820 entries! Extend g_aEntries!\n");
194	}
195	}
196
197	/* Done? */
198	if (uCont == 0)
199	break;
200	}
201	if (g_cEntries == 0)
202	Bs3TestFailedF("No interesting E820 entries! Make sure you've assigned more than 4GB to the VM!\n");
203	else
204	{
205	uint64_t uFailurePoint = 0;
206	int rc;
207	Bs3TestPrintf("Found %u interesting entries covering %#llx bytes (%u GB).\n"
208	"From %#llx to %#llx\n",
209	g_cEntries, g_cbInteresting, (unsigned)(g_cbInteresting / _1G), g_uInterestingStart, g_uInterestingEnd);
210
211	if (g_uBs3EndOfRamAbove4G < g_uInterestingEnd)
212	Bs3TestFailedF("g_uBs3EndOfRamAbove4G (%#llx) is lower than g_uInterestingEnd (%#llx)!\n",
213	g_uBs3EndOfRamAbove4G, g_uInterestingEnd);
214
215
216	/*
217	* Map all the memory (Bs3Kit only maps memory below 4G).
218	*/
219	Bs3TestSub("Mapping memory above 4GB");
220	if (!(g_uBs3CpuDetected & BS3CPU_F_PSE))
221	Bs3TestFailedF("PSE was not detected!\n");
222	else if (!(ASMGetCR4() & X86_CR4_PSE))
223	Bs3TestFailedF("PSE was not enabled!\n");
224	else if (RT_SUCCESS(rc = Bs3PagingMapRamAbove4GForLM(&uFailurePoint)))
225	{
226	#define PAGES_2_MB(a_cPages) ((a_cPages) / (_1M / X86_PAGE_SIZE))
227	uint64_t cTotalPages;
228	unsigned iLoop;
229
230	/*
231	* Time touching all the memory.
232	*/
233	Bs3TestSub("Allocation speed");
234	{
235	uint64_t const nsStart = Bs3TestNow();
236	uint64_t const uTscStart = ASMReadTSC();
237	uint64_t const cPages = FirstTouchMemory();
238	uint64_t const cTicksElapsed = ASMReadTSC() - uTscStart;
239	uint64_t const cNsElapsed = Bs3TestNow() - nsStart;
240	uint64_t uThruput;
241	Bs3TestValue("Pages", cPages, VMMDEV_TESTING_UNIT_PAGES);
242	Bs3TestValue("MiBs", PAGES_2_MB(cPages), VMMDEV_TESTING_UNIT_MEGABYTES);
243	Bs3TestValue("Alloc elapsed", cNsElapsed, VMMDEV_TESTING_UNIT_NS);
244	Bs3TestValue("Alloc elapsed in ticks", cTicksElapsed, VMMDEV_TESTING_UNIT_TICKS);
245	Bs3TestValue("Page alloc time", cNsElapsed / cPages, VMMDEV_TESTING_UNIT_NS_PER_PAGE);
246	Bs3TestValue("Page alloc time in ticks", cTicksElapsed / cPages, VMMDEV_TESTING_UNIT_TICKS_PER_PAGE);
247	uThruput = cPages * RT_NS_1SEC / cNsElapsed;
248	Bs3TestValue("Alloc thruput", uThruput, VMMDEV_TESTING_UNIT_PAGES_PER_SEC);
249	Bs3TestValue("Alloc thruput in MiBs", PAGES_2_MB(uThruput), VMMDEV_TESTING_UNIT_MEGABYTES_PER_SEC);
250	cTotalPages = cPages;
251	}
252
253	/*
254	* Time accessing all the memory again. This might give a clue as to page pool performance.
255	*/
256	for (iLoop = 0; iLoop < 2; iLoop++)
257	{
258	Bs3TestSub(iLoop == 0 ? "2nd access" : "3rd access");
259	{
260	uint64_t const nsStart = Bs3TestNow();
261	uint64_t const uTscStart = ASMReadTSC();
262	uint64_t const cErrors = CheckTouchedMemory();
263	uint64_t const cTicksElapsed = ASMReadTSC() - uTscStart;
264	uint64_t const cNsElapsed = Bs3TestNow() - nsStart;
265	uint64_t uThruput;
266	Bs3TestValue("Access elapsed", cNsElapsed, VMMDEV_TESTING_UNIT_NS);
267	Bs3TestValue("Access elapsed in ticks", cTicksElapsed, VMMDEV_TESTING_UNIT_TICKS);
268	Bs3TestValue("Page access time", cNsElapsed / cTotalPages, VMMDEV_TESTING_UNIT_NS_PER_PAGE);
269	Bs3TestValue("Page access time in ticks", cTicksElapsed / cTotalPages, VMMDEV_TESTING_UNIT_TICKS_PER_PAGE);
270	uThruput = cTotalPages * RT_NS_1SEC / cNsElapsed;
271	Bs3TestValue("Access thruput", uThruput, VMMDEV_TESTING_UNIT_PAGES_PER_SEC);
272	Bs3TestValue("Access thruput in MiBs", PAGES_2_MB(uThruput), VMMDEV_TESTING_UNIT_MEGABYTES_PER_SEC);
273	}
274	}
275	}
276	else
277	Bs3TestFailedF("Bs3PagingMapRamAbove4GForLM failed at %#llx: %d", uFailurePoint, rc);
278	}
279
280	Bs3TestTerm();
281	}
282

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