tests/plugin/bb.c

   1 /*
   2  * Copyright (C) 2018, Emilio G. Cota <cota@braap.org>
   3  *
   4  * License: GNU GPL, version 2 or later.
   5  *   See the COPYING file in the top-level directory.
   6  */
   7 #include <inttypes.h>
   8 #include <assert.h>
   9 #include <stdlib.h>
  10 #include <string.h>
  11 #include <unistd.h>
  12 #include <stdio.h>
  13 #include <glib.h>
  14
  15 #include <qemu-plugin.h>
  16
  17 QEMU_PLUGIN_EXPORT int qemu_plugin_version = QEMU_PLUGIN_VERSION;
  18
  19 typedef struct {
  20     GMutex lock;
  21     int index;
  22     uint64_t bb_count;
  23     uint64_t insn_count;
  24 } CPUCount;
  25
  26 /* Used by the inline & linux-user counts */
  27 static bool do_inline;
  28 static CPUCount inline_count;
  29
  30 /* Dump running CPU total on idle? */
  31 static bool idle_report;
  32 static GPtrArray *counts;
  33 static int max_cpus;
  34
  35 static void gen_one_cpu_report(CPUCount *count, GString *report)
  36 {
  37     if (count->bb_count) {
  38         g_string_append_printf(report, "CPU%d: "
  39                                "bb's: %" PRIu64", insns: %" PRIu64 "\n",
  40                                count->index,
  41                                count->bb_count, count->insn_count);
  42     }
  43 }
  44
  45 static void plugin_exit(qemu_plugin_id_t id, void *p)
  46 {
  47     g_autoptr(GString) report = g_string_new("");
  48
  49     if (do_inline || !max_cpus) {
  50         g_string_printf(report, "bb's: %" PRIu64", insns: %" PRIu64 "\n",
  51                         inline_count.bb_count, inline_count.insn_count);
  52     } else {
  53         g_ptr_array_foreach(counts, (GFunc) gen_one_cpu_report, report);
  54     }
  55     qemu_plugin_outs(report->str);
  56 }
  57
  58 static void vcpu_idle(qemu_plugin_id_t id, unsigned int cpu_index)
  59 {
  60     CPUCount *count = g_ptr_array_index(counts, cpu_index);
  61     g_autoptr(GString) report = g_string_new("");
  62     gen_one_cpu_report(count, report);
  63
  64     if (report->len > 0) {
  65         g_string_prepend(report, "Idling ");
  66         qemu_plugin_outs(report->str);
  67     }
  68 }
  69
  70 static void vcpu_tb_exec(unsigned int cpu_index, void *udata)
  71 {
  72     CPUCount *count = max_cpus ?
  73         g_ptr_array_index(counts, cpu_index) : &inline_count;
  74
  75     uintptr_t n_insns = (uintptr_t)udata;
  76     g_mutex_lock(&count->lock);
  77     count->insn_count += n_insns;
  78     count->bb_count++;
  79     g_mutex_unlock(&count->lock);
  80 }
  81
  82 static void vcpu_tb_trans(qemu_plugin_id_t id, struct qemu_plugin_tb *tb)
  83 {
  84     size_t n_insns = qemu_plugin_tb_n_insns(tb);
  85
  86     if (do_inline) {
  87         qemu_plugin_register_vcpu_tb_exec_inline(tb, QEMU_PLUGIN_INLINE_ADD_U64,
  88                                                  &inline_count.bb_count, 1);
  89         qemu_plugin_register_vcpu_tb_exec_inline(tb, QEMU_PLUGIN_INLINE_ADD_U64,
  90                                                  &inline_count.insn_count,
  91                                                  n_insns);
  92     } else {
  93         qemu_plugin_register_vcpu_tb_exec_cb(tb, vcpu_tb_exec,
  94                                              QEMU_PLUGIN_CB_NO_REGS,
  95                                              (void *)n_insns);
  96     }
  97 }
  98
  99 QEMU_PLUGIN_EXPORT int qemu_plugin_install(qemu_plugin_id_t id,
 100                                            const qemu_info_t *info,
 101                                            int argc, char **argv)
 102 {
 103     int i;
 104
 105     for (i = 0; i < argc; i++) {
 106         char *opt = argv[i];
 107         if (g_strcmp0(opt, "inline") == 0) {
 108             do_inline = true;
 109         } else if (g_strcmp0(opt, "idle") == 0) {
 110             idle_report = true;
 111         } else {
 112             fprintf(stderr, "option parsing failed: %s\n", opt);
 113             return -1;
 114         }
 115     }
 116
 117     if (info->system_emulation && !do_inline) {
 118         max_cpus = info->system.max_vcpus;
 119         counts = g_ptr_array_new();
 120         for (i = 0; i < max_cpus; i++) {
 121             CPUCount *count = g_new0(CPUCount, 1);
 122             g_mutex_init(&count->lock);
 123             count->index = i;
 124             g_ptr_array_add(counts, count);
 125         }
 126     } else if (!do_inline) {
 127         g_mutex_init(&inline_count.lock);
 128     }
 129
 130     if (idle_report) {
 131         qemu_plugin_register_vcpu_idle_cb(id, vcpu_idle);
 132     }
 133
 134     qemu_plugin_register_vcpu_tb_trans_cb(id, vcpu_tb_trans);
 135     qemu_plugin_register_atexit_cb(id, plugin_exit, NULL);
 136     return 0;
 137 }