Mahmoud Mandour <ma.mando...@gmail.com> writes:
> Added a table-like output which contains the total number of calls > for each used syscall along with the number of errors that occurred. > > Per-call tracing is still available through supplying the argument > ``print`` to the plugin. > > Signed-off-by: Mahmoud Mandour <ma.mando...@gmail.com> Queued to plugins/next, thanks. > --- > v3 -> v4: Added a missing ``static`` that was causing a compilation > error. Otherwise, everything else is left in place. > tests/plugin/syscall.c | 98 +++++++++++++++++++++++++++++++++++++++--- > 1 file changed, 93 insertions(+), 5 deletions(-) > > diff --git a/tests/plugin/syscall.c b/tests/plugin/syscall.c > index 53ee2ab6c4..6dd71092e1 100644 > --- a/tests/plugin/syscall.c > +++ b/tests/plugin/syscall.c > @@ -16,32 +16,120 @@ > > QEMU_PLUGIN_EXPORT int qemu_plugin_version = QEMU_PLUGIN_VERSION; > > +typedef struct { > + int64_t num; > + int64_t calls; > + int64_t errors; > +} SyscallStats; > + > +static GMutex lock; > +static GHashTable *statistics; > + > +static SyscallStats *get_or_create_entry(int64_t num) > +{ > + SyscallStats *entry = > + (SyscallStats *) g_hash_table_lookup(statistics, > GINT_TO_POINTER(num)); > + > + if (!entry) { > + entry = g_new0(SyscallStats, 1); > + entry->num = num; > + g_hash_table_insert(statistics, GINT_TO_POINTER(num), (gpointer) > entry); > + } > + > + return entry; > +} > + > static void vcpu_syscall(qemu_plugin_id_t id, unsigned int vcpu_index, > int64_t num, uint64_t a1, uint64_t a2, > uint64_t a3, uint64_t a4, uint64_t a5, > uint64_t a6, uint64_t a7, uint64_t a8) > { > - g_autofree gchar *out = g_strdup_printf("syscall #%" PRIi64 "\n", num); > - qemu_plugin_outs(out); > + if (statistics) { > + SyscallStats *entry; > + g_mutex_lock(&lock); > + entry = get_or_create_entry(num); > + entry->calls++; > + g_mutex_unlock(&lock); > + } else { > + g_autofree gchar *out = g_strdup_printf("syscall #%" PRIi64 "\n", > num); > + qemu_plugin_outs(out); > + } > } > > static void vcpu_syscall_ret(qemu_plugin_id_t id, unsigned int vcpu_idx, > int64_t num, int64_t ret) > +{ > + if (statistics) { > + SyscallStats *entry; > + > + g_mutex_lock(&lock); > + /* Should always return an existent entry. */ > + entry = get_or_create_entry(num); > + if (ret < 0) { > + entry->errors++; > + } > + g_mutex_unlock(&lock); > + } else { > + g_autofree gchar *out; > + out = g_strdup_printf("syscall #%" PRIi64 " returned -> %" PRIi64 > "\n", > + num, ret); > + qemu_plugin_outs(out); > + } > +} > + > +static void print_entry(gpointer val, gpointer user_data) > { > g_autofree gchar *out; > - out = g_strdup_printf("syscall #%" PRIi64 " returned -> %" PRIi64 "\n", > - num, ret); > + SyscallStats *entry = (SyscallStats *) val; > + int64_t syscall_num = entry->num; > + out = g_strdup_printf( > + "%-13" PRIi64 "%-6" PRIi64 " %" PRIi64 "\n", > + syscall_num, entry->calls, entry->errors); > qemu_plugin_outs(out); > } > > +static gint comp_func(gconstpointer ea, gconstpointer eb) > +{ > + SyscallStats *ent_a = (SyscallStats *) ea; > + SyscallStats *ent_b = (SyscallStats *) eb; > + > + return ent_a->calls > ent_b->calls ? -1 : 1; > +} > + > /* ************************************************************************* > */ > +static void plugin_exit(qemu_plugin_id_t id, void *p) > +{ > + if (!statistics) { > + return; > + } > + > + g_mutex_lock(&lock); > + GList *entries = g_hash_table_get_values(statistics); > + entries = g_list_sort(entries, comp_func); > + qemu_plugin_outs("syscall no. calls errors\n"); > > -static void plugin_exit(qemu_plugin_id_t id, void *p) {} > + g_list_foreach(entries, print_entry, NULL); > + > + g_list_free(entries); > + g_hash_table_destroy(statistics); > + g_mutex_unlock(&lock); > +} > > QEMU_PLUGIN_EXPORT int qemu_plugin_install(qemu_plugin_id_t id, > const qemu_info_t *info, > int argc, char **argv) > { > + if (argc == 0) { > + statistics = g_hash_table_new_full(NULL, g_direct_equal, NULL, > g_free); > + } else { > + for (int i = 0; i < argc; i++) { > + if (g_strcmp0(argv[i], "print") != 0) { > + fprintf(stderr, "unsupported argument: %s\n", argv[i]); > + return -1; > + } > + } > + } > + > qemu_plugin_register_vcpu_syscall_cb(id, vcpu_syscall); > qemu_plugin_register_vcpu_syscall_ret_cb(id, vcpu_syscall_ret); > qemu_plugin_register_atexit_cb(id, plugin_exit, NULL); -- Alex Bennée