406b53c9ca
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
4.0 KiB
C
138 lines
4.0 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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