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sysprofd: add API to set perf_event_paranoid

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This will allow us to get more information on demand when running the
profiler without endless tweaking by end users.
This commit is contained in:
Christian Hergert
2021-02-24 11:26:10 -08:00
parent adf8a3cd6a
commit 667180cbc8
2 changed files with 59 additions and 0 deletions
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47
src/sysprofd/ipc-service-impl.c
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@ -375,6 +375,52 @@ finish:
return TRUE;
}
static gboolean
ipc_service_impl_handle_set_paranoid (IpcService *service,
GDBusMethodInvocation *invocation,
int paranoid)
{
g_autoptr(GError) error = NULL;
g_autofree gchar *str = NULL;
int previous = G_MAXINT;
g_assert (IPC_IS_SERVICE (service));
g_assert (G_IS_DBUS_METHOD_INVOCATION (invocation));
paranoid = CLAMP (paranoid, -1, 2);
if (!g_file_get_contents ("/proc/sys/kernel/perf_event_paranoid", &str, NULL, &error))
{
g_warning ("Failed to discover previous perf_event_paranoid setting: %s", error->message);
goto finish;
}
previous = g_ascii_strtoll (str, NULL, 10);
if (previous != paranoid)
{
char paranoid_str[8];
gssize len = g_snprintf (paranoid_str, sizeof paranoid_str, "%d", paranoid);
if (!file_set_contents_no_backup ("/proc/sys/kernel/perf_event_paranoid", paranoid_str, len, &error))
g_warning ("Failed to set perf_event_paranoid: %s", error->message);
}
finish:
if (error != NULL)
g_dbus_method_invocation_return_error (g_steal_pointer (&invocation),
G_DBUS_ERROR,
G_DBUS_ERROR_FAILED,
"Failed to set perf_event_paranoid: %s",
error->message);
else
ipc_service_complete_set_paranoid (service,
g_steal_pointer (&invocation),
previous);
return TRUE;
}
static void
init_service_iface (IpcServiceIface *iface)
{
@ -384,6 +430,7 @@ init_service_iface (IpcServiceIface *iface)
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;
iface->handle_set_paranoid = ipc_service_impl_handle_set_paranoid;
}
G_DEFINE_TYPE_WITH_CODE (IpcServiceImpl, ipc_service_impl, IPC_TYPE_SERVICE_SKELETON,