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![Richard Henderson](/assets/img/avatar_default.png)
This is a perfectly natural occurrence for x86 "rep movb", where the "rep" prefix forms a counted loop of the one insn. During the tests/tcg/multiarch/memory test, this logging is triggered over 350000 times. Within the context of cross-i386-tci build, which is already slow by nature, the logging is sufficient to push the test into timeout. Signed-off-by: Richard Henderson <richard.henderson@linaro.org>
219 lines
6.5 KiB
C
219 lines
6.5 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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#define MAX_CPUS 8 /* lets not go nuts */
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typedef struct {
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uint64_t insn_count;
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} InstructionCount;
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static InstructionCount counts[MAX_CPUS];
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static uint64_t inline_insn_count;
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static bool do_inline;
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static bool do_size;
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static GArray *sizes;
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typedef struct {
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char *match_string;
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uint64_t hits[MAX_CPUS];
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uint64_t last_hit[MAX_CPUS];
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uint64_t total_delta[MAX_CPUS];
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GPtrArray *history[MAX_CPUS];
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} Match;
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static GArray *matches;
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typedef struct {
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Match *match;
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uint64_t vaddr;
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uint64_t hits;
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char *disas;
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} Instruction;
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static void vcpu_insn_exec_before(unsigned int cpu_index, void *udata)
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{
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unsigned int i = cpu_index % MAX_CPUS;
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InstructionCount *c = &counts[i];
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c->insn_count++;
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}
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static void vcpu_insn_matched_exec_before(unsigned int cpu_index, void *udata)
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{
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unsigned int i = cpu_index % MAX_CPUS;
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Instruction *insn = (Instruction *) udata;
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Match *match = insn->match;
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g_autoptr(GString) ts = g_string_new("");
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insn->hits++;
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g_string_append_printf(ts, "0x%" PRIx64 ", '%s', %"PRId64 " hits",
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insn->vaddr, insn->disas, insn->hits);
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uint64_t icount = counts[i].insn_count;
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uint64_t delta = icount - match->last_hit[i];
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match->hits[i]++;
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match->total_delta[i] += delta;
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g_string_append_printf(ts,
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", %"PRId64" match hits, "
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"Δ+%"PRId64 " since last match,"
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" %"PRId64 " avg insns/match\n",
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match->hits[i], delta,
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match->total_delta[i] / match->hits[i]);
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match->last_hit[i] = icount;
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qemu_plugin_outs(ts->str);
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g_ptr_array_add(match->history[i], insn);
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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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size_t n = qemu_plugin_tb_n_insns(tb);
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size_t i;
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for (i = 0; i < n; i++) {
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struct qemu_plugin_insn *insn = qemu_plugin_tb_get_insn(tb, i);
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if (do_inline) {
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qemu_plugin_register_vcpu_insn_exec_inline(
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insn, QEMU_PLUGIN_INLINE_ADD_U64, &inline_insn_count, 1);
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} else {
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uint64_t vaddr = qemu_plugin_insn_vaddr(insn);
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qemu_plugin_register_vcpu_insn_exec_cb(
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insn, vcpu_insn_exec_before, QEMU_PLUGIN_CB_NO_REGS,
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GUINT_TO_POINTER(vaddr));
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}
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if (do_size) {
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size_t sz = qemu_plugin_insn_size(insn);
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if (sz > sizes->len) {
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g_array_set_size(sizes, sz);
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}
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unsigned long *cnt = &g_array_index(sizes, unsigned long, sz);
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(*cnt)++;
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}
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/*
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* If we are tracking certain instructions we will need more
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* information about the instruction which we also need to
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* save if there is a hit.
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*/
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if (matches) {
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char *insn_disas = qemu_plugin_insn_disas(insn);
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int j;
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for (j = 0; j < matches->len; j++) {
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Match *m = &g_array_index(matches, Match, j);
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if (g_str_has_prefix(insn_disas, m->match_string)) {
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Instruction *rec = g_new0(Instruction, 1);
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rec->disas = g_strdup(insn_disas);
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rec->vaddr = qemu_plugin_insn_vaddr(insn);
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rec->match = m;
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qemu_plugin_register_vcpu_insn_exec_cb(
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insn, vcpu_insn_matched_exec_before,
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QEMU_PLUGIN_CB_NO_REGS, rec);
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}
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}
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g_free(insn_disas);
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}
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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) out = g_string_new(NULL);
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int i;
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if (do_size) {
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for (i = 0; i <= sizes->len; i++) {
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unsigned long *cnt = &g_array_index(sizes, unsigned long, i);
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if (*cnt) {
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g_string_append_printf(out,
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"len %d bytes: %ld insns\n", i, *cnt);
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}
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}
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} else if (do_inline) {
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g_string_append_printf(out, "insns: %" PRIu64 "\n", inline_insn_count);
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} else {
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uint64_t total_insns = 0;
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for (i = 0; i < MAX_CPUS; i++) {
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InstructionCount *c = &counts[i];
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if (c->insn_count) {
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g_string_append_printf(out, "cpu %d insns: %" PRIu64 "\n",
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i, c->insn_count);
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total_insns += c->insn_count;
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}
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}
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g_string_append_printf(out, "total insns: %" PRIu64 "\n",
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total_insns);
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}
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qemu_plugin_outs(out->str);
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}
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/* Add a match to the array of matches */
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static void parse_match(char *match)
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{
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Match new_match = { .match_string = match };
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int i;
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for (i = 0; i < MAX_CPUS; i++) {
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new_match.history[i] = g_ptr_array_new();
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}
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if (!matches) {
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matches = g_array_new(false, true, sizeof(Match));
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}
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g_array_append_val(matches, new_match);
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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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for (int i = 0; i < argc; i++) {
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char *opt = argv[i];
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g_autofree char **tokens = g_strsplit(opt, "=", 2);
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if (g_strcmp0(tokens[0], "inline") == 0) {
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if (!qemu_plugin_bool_parse(tokens[0], tokens[1], &do_inline)) {
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fprintf(stderr, "boolean argument parsing failed: %s\n", opt);
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return -1;
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}
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} else if (g_strcmp0(tokens[0], "sizes") == 0) {
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if (!qemu_plugin_bool_parse(tokens[0], tokens[1], &do_size)) {
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fprintf(stderr, "boolean argument parsing failed: %s\n", opt);
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return -1;
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}
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} else if (g_strcmp0(tokens[0], "match") == 0) {
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parse_match(tokens[1]);
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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 (do_size) {
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sizes = g_array_new(true, true, sizeof(unsigned long));
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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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