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governor: add daemon API and helpers to set CPU governor

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This commit is contained in:
Christian Hergert
2019-06-14 08:03:37 -07:00
parent c46ac1374b
commit fc745767d4
4 changed files with 199 additions and 0 deletions
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112
src/sysprofd/ipc-service-impl.c
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@ -46,6 +46,54 @@ enum {
static guint signals [N_SIGNALS];
static gboolean
file_set_contents_no_backup (const gchar *path,
const gchar *contents,
gssize len,
GError **error)
{
int fd;
g_return_val_if_fail (path != NULL, FALSE);
if (contents == NULL)
contents = "";
if (len < 0)
len = strlen (contents);
/* This is only for setting files in /sys, which need to be a single
* write anyway, so don't try to incrementally write at all.
*/
fd = open (path, O_WRONLY, 0644);
if (fd == -1)
{
int errsv = errno;
g_set_error (error,
G_FILE_ERROR,
g_file_error_from_errno (errsv),
"%s", g_strerror (errsv));
return FALSE;
}
if (write (fd, contents, len) != len)
{
int errsv = errno;
g_set_error (error,
G_FILE_ERROR,
g_file_error_from_errno (errsv),
"%s", g_strerror (errsv));
close (fd);
return FALSE;
}
close (fd);
return TRUE;
}
static gboolean
ipc_service_impl_handle_list_processes (IpcService *service,
GDBusMethodInvocation *invocation)
@ -263,6 +311,69 @@ ipc_service_impl_handle_get_process_info (IpcService *service,
return TRUE;
}
static gboolean
ipc_service_impl_handle_set_governor (IpcService *service,
GDBusMethodInvocation *invocation,
const gchar *governor)
{
g_autoptr(GVariant) res = NULL;
g_autofree gchar *available = NULL;
g_autofree gchar *previous = NULL;
gboolean had_error = FALSE;
guint n_procs;
g_assert (IPC_IS_SERVICE (service));
g_assert (G_IS_DBUS_METHOD_INVOCATION (invocation));
g_assert (governor != NULL);
if (!g_file_get_contents ("/sys/devices/system/cpu/cpu0/cpufreq/scaling_available_governors", &available, NULL, NULL))
{
g_warning ("Failed to discover available governors");
had_error = TRUE;
goto finish;
}
if (strstr (available, governor) == NULL)
{
/* No such governor */
g_warning ("No such governor \"%s\"", governor);
had_error = TRUE;
goto finish;
}
if (g_file_get_contents ("/sys/devices/system/cpu/cpu0/cpufreq/scaling_governor", &previous, NULL, NULL))
g_strstrip (previous);
else
previous = g_strdup ("unknown");
n_procs = g_get_num_processors ();
for (guint i = 0; i < n_procs; i++)
{
g_autofree gchar *path = g_strdup_printf ("/sys/devices/system/cpu/cpu%u/cpufreq/scaling_governor", i);
g_autoptr(GError) error = NULL;
if (!file_set_contents_no_backup (path, governor, -1, &error))
{
g_warning ("Failed to set governor on CPU %u: %s", i, error->message);
had_error = TRUE;
}
}
finish:
if (had_error)
g_dbus_method_invocation_return_error (g_steal_pointer (&invocation),
G_DBUS_ERROR,
G_DBUS_ERROR_FAILED,
"Failed to set governor");
else
ipc_service_complete_set_governor (service,
g_steal_pointer (&invocation),
previous);
return TRUE;
}
static void
init_service_iface (IpcServiceIface *iface)
{
@ -271,6 +382,7 @@ init_service_iface (IpcServiceIface *iface)
iface->handle_get_proc_fd = ipc_service_impl_handle_get_proc_fd;
iface->handle_perf_event_open = ipc_service_impl_handle_perf_event_open;
iface->handle_get_process_info = ipc_service_impl_handle_get_process_info;
iface->handle_set_governor = ipc_service_impl_handle_set_governor;
}
G_DEFINE_TYPE_WITH_CODE (IpcServiceImpl, ipc_service_impl, IPC_TYPE_SERVICE_SKELETON,