1 /* 2 * SPDX-License-Identifier: LGPL-2.1-or-later 3 * 4 * QEMU TCG monitor 5 * 6 * Copyright (c) 2003-2005 Fabrice Bellard 7 */ 8 9 #include "qemu/osdep.h" 10 #include "qemu/accel.h" 11 #include "qemu/qht.h" 12 #include "qapi/error.h" 13 #include "qapi/type-helpers.h" 14 #include "qapi/qapi-commands-machine.h" 15 #include "monitor/monitor.h" 16 #include "system/cpu-timers.h" 17 #include "exec/icount.h" 18 #include "system/tcg.h" 19 #include "tcg/tcg.h" 20 #include "internal-common.h" 21 #include "tb-context.h" 22 #include <math.h> 23 24 static void dump_drift_info(GString *buf) 25 { 26 if (!icount_enabled()) { 27 return; 28 } 29 30 g_string_append_printf(buf, "Host - Guest clock %"PRIi64" ms\n", 31 (cpu_get_clock() - icount_get()) / SCALE_MS); 32 if (icount_align_option) { 33 g_string_append_printf(buf, "Max guest delay %"PRIi64" ms\n", 34 -max_delay / SCALE_MS); 35 g_string_append_printf(buf, "Max guest advance %"PRIi64" ms\n", 36 max_advance / SCALE_MS); 37 } else { 38 g_string_append_printf(buf, "Max guest delay NA\n"); 39 g_string_append_printf(buf, "Max guest advance NA\n"); 40 } 41 } 42 43 static void dump_accel_info(GString *buf) 44 { 45 AccelState *accel = current_accel(); 46 bool one_insn_per_tb = object_property_get_bool(OBJECT(accel), 47 "one-insn-per-tb", 48 &error_fatal); 49 50 g_string_append_printf(buf, "Accelerator settings:\n"); 51 g_string_append_printf(buf, "one-insn-per-tb: %s\n\n", 52 one_insn_per_tb ? "on" : "off"); 53 } 54 55 static void print_qht_statistics(struct qht_stats hst, GString *buf) 56 { 57 uint32_t hgram_opts; 58 size_t hgram_bins; 59 char *hgram; 60 double avg; 61 62 if (!hst.head_buckets) { 63 return; 64 } 65 g_string_append_printf(buf, "TB hash buckets %zu/%zu " 66 "(%0.2f%% head buckets used)\n", 67 hst.used_head_buckets, hst.head_buckets, 68 (double)hst.used_head_buckets / 69 hst.head_buckets * 100); 70 71 hgram_opts = QDIST_PR_BORDER | QDIST_PR_LABELS; 72 hgram_opts |= QDIST_PR_100X | QDIST_PR_PERCENT; 73 if (qdist_xmax(&hst.occupancy) - qdist_xmin(&hst.occupancy) == 1) { 74 hgram_opts |= QDIST_PR_NODECIMAL; 75 } 76 hgram = qdist_pr(&hst.occupancy, 10, hgram_opts); 77 avg = qdist_avg(&hst.occupancy); 78 if (!isnan(avg)) { 79 g_string_append_printf(buf, "TB hash occupancy " 80 "%0.2f%% avg chain occ. " 81 "Histogram: %s\n", 82 avg * 100, hgram); 83 } 84 g_free(hgram); 85 86 hgram_opts = QDIST_PR_BORDER | QDIST_PR_LABELS; 87 hgram_bins = qdist_xmax(&hst.chain) - qdist_xmin(&hst.chain); 88 if (hgram_bins > 10) { 89 hgram_bins = 10; 90 } else { 91 hgram_bins = 0; 92 hgram_opts |= QDIST_PR_NODECIMAL | QDIST_PR_NOBINRANGE; 93 } 94 hgram = qdist_pr(&hst.chain, hgram_bins, hgram_opts); 95 avg = qdist_avg(&hst.chain); 96 if (!isnan(avg)) { 97 g_string_append_printf(buf, "TB hash avg chain %0.3f buckets. " 98 "Histogram: %s\n", 99 avg, hgram); 100 } 101 g_free(hgram); 102 } 103 104 struct tb_tree_stats { 105 size_t nb_tbs; 106 size_t host_size; 107 size_t target_size; 108 size_t max_target_size; 109 size_t direct_jmp_count; 110 size_t direct_jmp2_count; 111 size_t cross_page; 112 }; 113 114 static gboolean tb_tree_stats_iter(gpointer key, gpointer value, gpointer data) 115 { 116 const TranslationBlock *tb = value; 117 struct tb_tree_stats *tst = data; 118 119 tst->nb_tbs++; 120 tst->host_size += tb->tc.size; 121 tst->target_size += tb->size; 122 if (tb->size > tst->max_target_size) { 123 tst->max_target_size = tb->size; 124 } 125 if (tb->page_addr[1] != -1) { 126 tst->cross_page++; 127 } 128 if (tb->jmp_reset_offset[0] != TB_JMP_OFFSET_INVALID) { 129 tst->direct_jmp_count++; 130 if (tb->jmp_reset_offset[1] != TB_JMP_OFFSET_INVALID) { 131 tst->direct_jmp2_count++; 132 } 133 } 134 return false; 135 } 136 137 static void tlb_flush_counts(size_t *pfull, size_t *ppart, size_t *pelide) 138 { 139 CPUState *cpu; 140 size_t full = 0, part = 0, elide = 0; 141 142 CPU_FOREACH(cpu) { 143 full += qatomic_read(&cpu->neg.tlb.c.full_flush_count); 144 part += qatomic_read(&cpu->neg.tlb.c.part_flush_count); 145 elide += qatomic_read(&cpu->neg.tlb.c.elide_flush_count); 146 } 147 *pfull = full; 148 *ppart = part; 149 *pelide = elide; 150 } 151 152 static void tcg_dump_flush_info(GString *buf) 153 { 154 size_t flush_full, flush_part, flush_elide; 155 156 g_string_append_printf(buf, "TB flush count %u\n", 157 qatomic_read(&tb_ctx.tb_flush_count)); 158 g_string_append_printf(buf, "TB invalidate count %u\n", 159 qatomic_read(&tb_ctx.tb_phys_invalidate_count)); 160 161 tlb_flush_counts(&flush_full, &flush_part, &flush_elide); 162 g_string_append_printf(buf, "TLB full flushes %zu\n", flush_full); 163 g_string_append_printf(buf, "TLB partial flushes %zu\n", flush_part); 164 g_string_append_printf(buf, "TLB elided flushes %zu\n", flush_elide); 165 } 166 167 static void dump_exec_info(GString *buf) 168 { 169 struct tb_tree_stats tst = {}; 170 struct qht_stats hst; 171 size_t nb_tbs; 172 173 tcg_tb_foreach(tb_tree_stats_iter, &tst); 174 nb_tbs = tst.nb_tbs; 175 /* XXX: avoid using doubles ? */ 176 g_string_append_printf(buf, "Translation buffer state:\n"); 177 /* 178 * Report total code size including the padding and TB structs; 179 * otherwise users might think "-accel tcg,tb-size" is not honoured. 180 * For avg host size we use the precise numbers from tb_tree_stats though. 181 */ 182 g_string_append_printf(buf, "gen code size %zu/%zu\n", 183 tcg_code_size(), tcg_code_capacity()); 184 g_string_append_printf(buf, "TB count %zu\n", nb_tbs); 185 g_string_append_printf(buf, "TB avg target size %zu max=%zu bytes\n", 186 nb_tbs ? tst.target_size / nb_tbs : 0, 187 tst.max_target_size); 188 g_string_append_printf(buf, "TB avg host size %zu bytes " 189 "(expansion ratio: %0.1f)\n", 190 nb_tbs ? tst.host_size / nb_tbs : 0, 191 tst.target_size ? 192 (double)tst.host_size / tst.target_size : 0); 193 g_string_append_printf(buf, "cross page TB count %zu (%zu%%)\n", 194 tst.cross_page, 195 nb_tbs ? (tst.cross_page * 100) / nb_tbs : 0); 196 g_string_append_printf(buf, "direct jump count %zu (%zu%%) " 197 "(2 jumps=%zu %zu%%)\n", 198 tst.direct_jmp_count, 199 nb_tbs ? (tst.direct_jmp_count * 100) / nb_tbs : 0, 200 tst.direct_jmp2_count, 201 nb_tbs ? (tst.direct_jmp2_count * 100) / nb_tbs : 0); 202 203 qht_statistics_init(&tb_ctx.htable, &hst); 204 print_qht_statistics(hst, buf); 205 qht_statistics_destroy(&hst); 206 207 g_string_append_printf(buf, "\nStatistics:\n"); 208 tcg_dump_flush_info(buf); 209 } 210 211 void tcg_dump_stats(GString *buf) 212 { 213 dump_accel_info(buf); 214 dump_exec_info(buf); 215 dump_drift_info(buf); 216 } 217 218 HumanReadableText *qmp_x_query_jit(Error **errp) 219 { 220 g_autoptr(GString) buf = g_string_new(""); 221 222 if (!tcg_enabled()) { 223 error_setg(errp, "JIT information is only available with accel=tcg"); 224 return NULL; 225 } 226 227 tcg_dump_stats(buf); 228 229 return human_readable_text_from_str(buf); 230 } 231 232 static void hmp_tcg_register(void) 233 { 234 monitor_register_hmp_info_hrt("jit", qmp_x_query_jit); 235 } 236 237 type_init(hmp_tcg_register); 238