1 files changed, 14 insertions, 0 deletions

diff --git a/Documentation/ABI/testing/sysfs-power b/Documentation/ABI/testing/sysfs-power
index 194ca446ac28..b464d12761ba 100644
--- a/Documentation/ABI/testing/sysfs-power
+++ b/Documentation/ABI/testing/sysfs-power
@@ -158,3 +158,17 @@ Description:
                 successful, will make the kernel abort a subsequent transition
                 to a sleep state if any wakeup events are reported after the
                 write has returned.
+
+What:           /sys/power/reserved_size
+Date:           May 2011
+Contact:        Rafael J. Wysocki <rjw@sisk.pl>
+Description:
+                The /sys/power/reserved_size file allows user space to control
+                the amount of memory reserved for allocations made by device
+                drivers during the "device freeze" stage of hibernation.  It can
+                be written a string representing a non-negative integer that
+                will be used as the amount of memory to reserve for allocations
+                made by device drivers' "freeze" callbacks, in bytes.
+
+                Reading from this file will display the current value, which is
+                set to 1 MB by default.