145 lines
4.0 KiB
C
145 lines
4.0 KiB
C
/*
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* Copyright (C) 2020, Matthias Weckbecker <matthias@weckbecker.name>
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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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int64_t num;
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int64_t calls;
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int64_t errors;
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} SyscallStats;
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static GMutex lock;
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static GHashTable *statistics;
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static SyscallStats *get_or_create_entry(int64_t num)
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{
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SyscallStats *entry =
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(SyscallStats *) g_hash_table_lookup(statistics, GINT_TO_POINTER(num));
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if (!entry) {
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entry = g_new0(SyscallStats, 1);
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entry->num = num;
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g_hash_table_insert(statistics, GINT_TO_POINTER(num), (gpointer) entry);
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}
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return entry;
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}
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static void vcpu_syscall(qemu_plugin_id_t id, unsigned int vcpu_index,
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int64_t num, uint64_t a1, uint64_t a2,
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uint64_t a3, uint64_t a4, uint64_t a5,
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uint64_t a6, uint64_t a7, uint64_t a8)
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{
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if (statistics) {
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SyscallStats *entry;
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g_mutex_lock(&lock);
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entry = get_or_create_entry(num);
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entry->calls++;
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g_mutex_unlock(&lock);
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} else {
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g_autofree gchar *out = g_strdup_printf("syscall #%" PRIi64 "\n", num);
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qemu_plugin_outs(out);
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}
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}
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static void vcpu_syscall_ret(qemu_plugin_id_t id, unsigned int vcpu_idx,
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int64_t num, int64_t ret)
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{
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if (statistics) {
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SyscallStats *entry;
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g_mutex_lock(&lock);
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/* Should always return an existent entry. */
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entry = get_or_create_entry(num);
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if (ret < 0) {
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entry->errors++;
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}
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g_mutex_unlock(&lock);
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} else {
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g_autofree gchar *out = g_strdup_printf(
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"syscall #%" PRIi64 " returned -> %" PRIi64 "\n", num, ret);
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qemu_plugin_outs(out);
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}
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}
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static void print_entry(gpointer val, gpointer user_data)
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{
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SyscallStats *entry = (SyscallStats *) val;
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int64_t syscall_num = entry->num;
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g_autofree gchar *out = g_strdup_printf(
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"%-13" PRIi64 "%-6" PRIi64 " %" PRIi64 "\n",
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syscall_num, entry->calls, entry->errors);
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qemu_plugin_outs(out);
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}
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static gint comp_func(gconstpointer ea, gconstpointer eb)
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{
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SyscallStats *ent_a = (SyscallStats *) ea;
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SyscallStats *ent_b = (SyscallStats *) eb;
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return ent_a->calls > ent_b->calls ? -1 : 1;
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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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if (!statistics) {
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return;
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}
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g_mutex_lock(&lock);
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GList *entries = g_hash_table_get_values(statistics);
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entries = g_list_sort(entries, comp_func);
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qemu_plugin_outs("syscall no. calls errors\n");
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g_list_foreach(entries, print_entry, NULL);
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g_list_free(entries);
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g_hash_table_destroy(statistics);
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g_mutex_unlock(&lock);
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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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bool do_print = false;
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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], "print") == 0) {
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if (!qemu_plugin_bool_parse(tokens[0], tokens[1], &do_print)) {
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fprintf(stderr, "boolean argument parsing failed: %s\n", opt);
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}
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} else {
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fprintf(stderr, "unsupported argument: %s\n", argv[i]);
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return -1;
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}
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}
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if (!do_print) {
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statistics = g_hash_table_new_full(NULL, g_direct_equal, NULL, g_free);
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}
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qemu_plugin_register_vcpu_syscall_cb(id, vcpu_syscall);
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qemu_plugin_register_vcpu_syscall_ret_cb(id, vcpu_syscall_ret);
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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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