| 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 | |
| 21 | QEMU_PLUGIN_EXPORT int qemu_plugin_version = QEMU_PLUGIN_VERSION; |
| 22 | |
| 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, gpointer d) |
| 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(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_with_data(counts, cmp_access_count, NULL); |
| 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 | "0x%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(g_int64_hash, g_int64_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_phys_addr(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, &page); |
| 134 | |
| 135 | if (!count) { |
| 136 | count = g_new0(PageCounters, 1); |
| 137 | count->page_address = page; |
| 138 | g_hash_table_insert(pages, &count->page_address, 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(struct qemu_plugin_tb *tb, void *userdata) |
| 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 | g_auto(GStrv) tokens = g_strsplit(opt, "=", -1); |
| 173 | |
| 174 | if (g_strcmp0(tokens[0], "sortby") == 0) { |
| 175 | if (g_strcmp0(tokens[1], "reads") == 0) { |
| 176 | sort_by = SORT_R; |
| 177 | } else if (g_strcmp0(tokens[1], "writes") == 0) { |
| 178 | sort_by = SORT_W; |
| 179 | } else if (g_strcmp0(tokens[1], "address") == 0) { |
| 180 | sort_by = SORT_A; |
| 181 | } else { |
| 182 | fprintf(stderr, "invalid value to sortby: %s\n", tokens[1]); |
| 183 | return -1; |
| 184 | } |
| 185 | } else if (g_strcmp0(tokens[0], "io") == 0) { |
| 186 | if (!qemu_plugin_bool_parse(tokens[0], tokens[1], &track_io)) { |
| 187 | fprintf(stderr, "boolean argument parsing failed: %s\n", opt); |
| 188 | return -1; |
| 189 | } |
| 190 | } else if (g_strcmp0(tokens[0], "pagesize") == 0) { |
| 191 | page_size = g_ascii_strtoull(tokens[1], NULL, 10); |
| 192 | } else { |
| 193 | fprintf(stderr, "option parsing failed: %s\n", opt); |
| 194 | return -1; |
| 195 | } |
| 196 | } |
| 197 | |
| 198 | plugin_init(); |
| 199 | |
| 200 | qemu_plugin_register_vcpu_tb_trans_cb(id, vcpu_tb_trans, NULL); |
| 201 | qemu_plugin_register_atexit_cb(id, plugin_exit, NULL); |
| 202 | return 0; |
| 203 | } |