While there isn't any easy way to make the inline counts thread safe we can ensure the callback based ones are. While we are at it we can reduce introduce a new option ("idle") to dump a report of the current bb and insn count each time a vCPU enters the idle state. Signed-off-by: Alex Bennée <alex.bennee@linaro.org> Reviewed-by: Robert Foley <robert.foley@linaro.org> Cc: Dave Bort <dbort@dbort.com> Message-Id: <20200713200415.26214-8-alex.bennee@linaro.org>
138 lines
4 KiB
C
138 lines
4 KiB
C
/*
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* Copyright (C) 2018, Emilio G. Cota <cota@braap.org>
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*
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* License: GNU GPL, version 2 or later.
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* See the COPYING file in the top-level directory.
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*/
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#include <inttypes.h>
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#include <assert.h>
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#include <stdlib.h>
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#include <string.h>
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#include <unistd.h>
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#include <stdio.h>
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#include <glib.h>
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#include <qemu-plugin.h>
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QEMU_PLUGIN_EXPORT int qemu_plugin_version = QEMU_PLUGIN_VERSION;
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typedef struct {
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GMutex lock;
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int index;
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uint64_t bb_count;
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uint64_t insn_count;
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} CPUCount;
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/* Used by the inline & linux-user counts */
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static bool do_inline;
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static CPUCount inline_count;
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/* Dump running CPU total on idle? */
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static bool idle_report;
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static GPtrArray *counts;
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static int max_cpus;
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static void gen_one_cpu_report(CPUCount *count, GString *report)
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{
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if (count->bb_count) {
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g_string_append_printf(report, "CPU%d: "
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"bb's: %" PRIu64", insns: %" PRIu64 "\n",
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count->index,
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count->bb_count, count->insn_count);
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}
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}
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static void plugin_exit(qemu_plugin_id_t id, void *p)
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{
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g_autoptr(GString) report = g_string_new("");
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if (do_inline || !max_cpus) {
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g_string_printf(report, "bb's: %" PRIu64", insns: %" PRIu64 "\n",
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inline_count.bb_count, inline_count.insn_count);
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} else {
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g_ptr_array_foreach(counts, (GFunc) gen_one_cpu_report, report);
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}
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qemu_plugin_outs(report->str);
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}
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static void vcpu_idle(qemu_plugin_id_t id, unsigned int cpu_index)
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{
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CPUCount *count = g_ptr_array_index(counts, cpu_index);
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g_autoptr(GString) report = g_string_new("");
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gen_one_cpu_report(count, report);
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if (report->len > 0) {
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g_string_prepend(report, "Idling ");
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qemu_plugin_outs(report->str);
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}
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}
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static void vcpu_tb_exec(unsigned int cpu_index, void *udata)
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{
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CPUCount *count = max_cpus ?
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g_ptr_array_index(counts, cpu_index) : &inline_count;
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unsigned long n_insns = (unsigned long)udata;
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g_mutex_lock(&count->lock);
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count->insn_count += n_insns;
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count->bb_count++;
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g_mutex_unlock(&count->lock);
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}
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static void vcpu_tb_trans(qemu_plugin_id_t id, struct qemu_plugin_tb *tb)
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{
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unsigned long n_insns = qemu_plugin_tb_n_insns(tb);
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if (do_inline) {
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qemu_plugin_register_vcpu_tb_exec_inline(tb, QEMU_PLUGIN_INLINE_ADD_U64,
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&inline_count.bb_count, 1);
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qemu_plugin_register_vcpu_tb_exec_inline(tb, QEMU_PLUGIN_INLINE_ADD_U64,
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&inline_count.insn_count,
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n_insns);
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} else {
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qemu_plugin_register_vcpu_tb_exec_cb(tb, vcpu_tb_exec,
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QEMU_PLUGIN_CB_NO_REGS,
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(void *)n_insns);
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}
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}
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QEMU_PLUGIN_EXPORT int qemu_plugin_install(qemu_plugin_id_t id,
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const qemu_info_t *info,
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int argc, char **argv)
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{
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int i;
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for (i = 0; i < argc; i++) {
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char *opt = argv[i];
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if (g_strcmp0(opt, "inline") == 0) {
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do_inline = true;
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} else if (g_strcmp0(opt, "idle") == 0) {
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idle_report = true;
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} else {
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fprintf(stderr, "option parsing failed: %s\n", opt);
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return -1;
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}
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}
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if (info->system_emulation && !do_inline) {
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max_cpus = info->system.max_vcpus;
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counts = g_ptr_array_new();
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for (i = 0; i < max_cpus; i++) {
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CPUCount *count = g_new0(CPUCount, 1);
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g_mutex_init(&count->lock);
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count->index = i;
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g_ptr_array_add(counts, count);
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}
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} else if (!do_inline) {
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g_mutex_init(&inline_count.lock);
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}
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if (idle_report) {
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qemu_plugin_register_vcpu_idle_cb(id, vcpu_idle);
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}
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qemu_plugin_register_vcpu_tb_trans_cb(id, vcpu_tb_trans);
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qemu_plugin_register_atexit_cb(id, plugin_exit, NULL);
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return 0;
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}
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