Gio.MemoryMonitor

g GObject.GInterface GObject.GInterface Gio.MemoryMonitor Gio.MemoryMonitor GObject.GInterface->Gio.MemoryMonitor

Implementations:
 None

Methods

class dup_default ()

Virtual Methods

  do_low_memory_warning (level)

Properties

None

Signals

Name Short Description
low-memory-warning Emitted when the system is running low on free memory.

Fields

None

Class Details

class Gio.MemoryMonitor
Bases:GObject.GInterface
Structure:Gio.MemoryMonitorInterface

Gio.MemoryMonitor will monitor system memory and suggest to the application when to free memory so as to leave more room for other applications. It is implemented on Linux using the Low Memory Monitor (API documentation).

There is also an implementation for use inside Flatpak sandboxes.

Possible actions to take when the signal is received are:

  • Free caches
  • Save files that haven’t been looked at in a while to disk, ready to be reopened when needed
  • Run a garbage collection cycle
  • Try and compress fragmented allocations
  • Exit on idle if the process has no reason to stay around
  • Call malloc_trim(3) to return cached heap pages to the kernel (if supported by your libc)

Note that some actions may not always improve system performance, and so should be profiled for your application. malloc_trim(), for example, may make future heap allocations slower (due to releasing cached heap pages back to the kernel).

See Gio.MemoryMonitorWarningLevel for details on the various warning levels.

static void
warning_cb (GMemoryMonitor *m, GMemoryMonitorWarningLevel level)
{
  g_debug ("Warning level: %d", level);
  if (warning_level > G_MEMORY_MONITOR_WARNING_LEVEL_LOW)
    drop_caches ();
}

static GMemoryMonitor *
monitor_low_memory (void)
{
  GMemoryMonitor *m;
  m = g_memory_monitor_dup_default ();
  g_signal_connect (G_OBJECT (m), "low-memory-warning",
                    G_CALLBACK (warning_cb), NULL);
  return m;
}

Don’t forget to disconnect the Gio.MemoryMonitor ::low-memory-warning signal, and unref the Gio.MemoryMonitor itself when exiting.

New in version 2.64.

classmethod dup_default()[source]
Returns:a new reference to the default Gio.MemoryMonitor
Return type:Gio.MemoryMonitor

Gets a reference to the default Gio.MemoryMonitor for the system.

New in version 2.64.

do_low_memory_warning(level) virtual
Parameters:level (Gio.MemoryMonitorWarningLevel) –

Signal Details

Gio.MemoryMonitor.signals.low_memory_warning(memory_monitor, level)
Signal Name:

low-memory-warning

Flags:

RUN_LAST

Parameters:

Emitted when the system is running low on free memory. The signal handler should then take the appropriate action depending on the warning level. See the Gio.MemoryMonitorWarningLevel documentation for details.

New in version 2.64.