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12268df3 AB |
1 | /* |
2 | * Copyright (C) 2019, Alex Bennée <alex.bennee@linaro.org> | |
3 | * | |
4 | * Hot Pages - show which pages saw the most memory accesses. | |
5 | * | |
6 | * License: GNU GPL, version 2 or later. | |
7 | * See the COPYING file in the top-level directory. | |
8 | */ | |
9 | ||
10 | #include <inttypes.h> | |
11 | #include <assert.h> | |
12 | #include <stdlib.h> | |
13 | #include <inttypes.h> | |
14 | #include <string.h> | |
15 | #include <unistd.h> | |
16 | #include <stdio.h> | |
17 | #include <glib.h> | |
18 | ||
19 | #include <qemu-plugin.h> | |
20 | ||
3fb356cc AB |
21 | QEMU_PLUGIN_EXPORT int qemu_plugin_version = QEMU_PLUGIN_VERSION; |
22 | ||
12268df3 AB |
23 | #define ARRAY_SIZE(x) (sizeof(x) / sizeof((x)[0])) |
24 | ||
25 | static uint64_t page_size = 4096; | |
26 | static uint64_t page_mask; | |
27 | static int limit = 50; | |
28 | static enum qemu_plugin_mem_rw rw = QEMU_PLUGIN_MEM_RW; | |
29 | static bool track_io; | |
30 | ||
31 | enum sort_type { | |
32 | SORT_RW = 0, | |
33 | SORT_R, | |
34 | SORT_W, | |
35 | SORT_A | |
36 | }; | |
37 | ||
38 | static int sort_by = SORT_RW; | |
39 | ||
40 | typedef struct { | |
41 | uint64_t page_address; | |
42 | int cpu_read; | |
43 | int cpu_write; | |
44 | uint64_t reads; | |
45 | uint64_t writes; | |
46 | } PageCounters; | |
47 | ||
48 | static GMutex lock; | |
49 | static GHashTable *pages; | |
50 | ||
51 | static gint cmp_access_count(gconstpointer a, gconstpointer b) | |
52 | { | |
53 | PageCounters *ea = (PageCounters *) a; | |
54 | PageCounters *eb = (PageCounters *) b; | |
55 | int r; | |
56 | switch (sort_by) { | |
57 | case SORT_RW: | |
58 | r = (ea->reads + ea->writes) > (eb->reads + eb->writes) ? -1 : 1; | |
59 | break; | |
60 | case SORT_R: | |
61 | r = ea->reads > eb->reads ? -1 : 1; | |
62 | break; | |
63 | case SORT_W: | |
64 | r = ea->writes > eb->writes ? -1 : 1; | |
65 | break; | |
66 | case SORT_A: | |
67 | r = ea->page_address > eb->page_address ? -1 : 1; | |
68 | break; | |
69 | default: | |
70 | g_assert_not_reached(); | |
71 | } | |
72 | return r; | |
73 | } | |
74 | ||
75 | ||
76 | static void plugin_exit(qemu_plugin_id_t id, void *p) | |
77 | { | |
78 | g_autoptr(GString) report = g_string_new("Addr, RCPUs, Reads, WCPUs, Writes\n"); | |
79 | int i; | |
80 | GList *counts; | |
81 | ||
82 | counts = g_hash_table_get_values(pages); | |
83 | if (counts && g_list_next(counts)) { | |
84 | GList *it; | |
85 | ||
86 | it = g_list_sort(counts, cmp_access_count); | |
87 | ||
88 | for (i = 0; i < limit && it->next; i++, it = it->next) { | |
89 | PageCounters *rec = (PageCounters *) it->data; | |
90 | g_string_append_printf(report, | |
91 | "%#016"PRIx64", 0x%04x, %"PRId64 | |
92 | ", 0x%04x, %"PRId64"\n", | |
93 | rec->page_address, | |
94 | rec->cpu_read, rec->reads, | |
95 | rec->cpu_write, rec->writes); | |
96 | } | |
97 | g_list_free(it); | |
98 | } | |
99 | ||
100 | qemu_plugin_outs(report->str); | |
101 | } | |
102 | ||
103 | static void plugin_init(void) | |
104 | { | |
105 | page_mask = (page_size - 1); | |
106 | pages = g_hash_table_new(NULL, g_direct_equal); | |
107 | } | |
108 | ||
109 | static void vcpu_haddr(unsigned int cpu_index, qemu_plugin_meminfo_t meminfo, | |
110 | uint64_t vaddr, void *udata) | |
111 | { | |
112 | struct qemu_plugin_hwaddr *hwaddr = qemu_plugin_get_hwaddr(meminfo, vaddr); | |
113 | uint64_t page; | |
114 | PageCounters *count; | |
115 | ||
116 | /* We only get a hwaddr for system emulation */ | |
117 | if (track_io) { | |
118 | if (hwaddr && qemu_plugin_hwaddr_is_io(hwaddr)) { | |
119 | page = vaddr; | |
120 | } else { | |
121 | return; | |
122 | } | |
123 | } else { | |
124 | if (hwaddr && !qemu_plugin_hwaddr_is_io(hwaddr)) { | |
125 | page = (uint64_t) qemu_plugin_hwaddr_device_offset(hwaddr); | |
126 | } else { | |
127 | page = vaddr; | |
128 | } | |
129 | } | |
130 | page &= ~page_mask; | |
131 | ||
132 | g_mutex_lock(&lock); | |
133 | count = (PageCounters *) g_hash_table_lookup(pages, GUINT_TO_POINTER(page)); | |
134 | ||
135 | if (!count) { | |
136 | count = g_new0(PageCounters, 1); | |
137 | count->page_address = page; | |
138 | g_hash_table_insert(pages, GUINT_TO_POINTER(page), (gpointer) count); | |
139 | } | |
140 | if (qemu_plugin_mem_is_store(meminfo)) { | |
141 | count->writes++; | |
142 | count->cpu_write |= (1 << cpu_index); | |
143 | } else { | |
144 | count->reads++; | |
145 | count->cpu_read |= (1 << cpu_index); | |
146 | } | |
147 | ||
148 | g_mutex_unlock(&lock); | |
149 | } | |
150 | ||
151 | static void vcpu_tb_trans(qemu_plugin_id_t id, struct qemu_plugin_tb *tb) | |
152 | { | |
153 | size_t n = qemu_plugin_tb_n_insns(tb); | |
154 | size_t i; | |
155 | ||
156 | for (i = 0; i < n; i++) { | |
157 | struct qemu_plugin_insn *insn = qemu_plugin_tb_get_insn(tb, i); | |
158 | qemu_plugin_register_vcpu_mem_cb(insn, vcpu_haddr, | |
159 | QEMU_PLUGIN_CB_NO_REGS, | |
160 | rw, NULL); | |
161 | } | |
162 | } | |
163 | ||
164 | QEMU_PLUGIN_EXPORT | |
165 | int qemu_plugin_install(qemu_plugin_id_t id, const qemu_info_t *info, | |
166 | int argc, char **argv) | |
167 | { | |
168 | int i; | |
169 | ||
170 | for (i = 0; i < argc; i++) { | |
171 | char *opt = argv[i]; | |
172 | if (g_strcmp0(opt, "reads") == 0) { | |
173 | sort_by = SORT_R; | |
174 | } else if (g_strcmp0(opt, "writes") == 0) { | |
175 | sort_by = SORT_W; | |
176 | } else if (g_strcmp0(opt, "address") == 0) { | |
177 | sort_by = SORT_A; | |
178 | } else if (g_strcmp0(opt, "io") == 0) { | |
179 | track_io = true; | |
180 | } else if (g_str_has_prefix(opt, "pagesize=")) { | |
181 | page_size = g_ascii_strtoull(opt + 9, NULL, 10); | |
182 | } else { | |
183 | fprintf(stderr, "option parsing failed: %s\n", opt); | |
184 | return -1; | |
185 | } | |
186 | } | |
187 | ||
188 | plugin_init(); | |
189 | ||
190 | qemu_plugin_register_vcpu_tb_trans_cb(id, vcpu_tb_trans); | |
191 | qemu_plugin_register_atexit_cb(id, plugin_exit, NULL); | |
192 | return 0; | |
193 | } |