linux-toradex.git/kernel/power/power.h, branch v3.0.79

PM / Hibernate: Add sysfs knob to control size of memory for drivers

2011-05-17T21:19:19+00:00

Martin reports that on his system hibernation occasionally fails due
to the lack of memory, because the radeon driver apparently allocates
too much of it during the device freeze stage.  It turns out that the
amount of memory allocated by radeon during hibernation (and
presumably during system suspend too) depends on the utilization of
the GPU (e.g. hibernating while there are two KDE 4 sessions with
compositing enabled causes radeon to allocate more memory than for
one KDE 4 session).

In principle it should be possible to use image_size to make the
memory preallocation mechanism free enough memory for the radeon
driver, but in practice it is not easy to guess the right value
because of the way the preallocation code uses image_size.  For this
reason, it seems reasonable to allow users to control the amount of
memory reserved for driver allocations made after the hibernate
preallocation, which currently is constant and amounts to 1 MB.

Introduce a new sysfs file, /sys/power/reserved_size, whose value
will be used as the amount of memory to reserve for the
post-preallocation reservations made by device drivers, in bytes.
For backwards compatibility, set its default (and initial) value to
the currently used number (1 MB).

References: https://bugzilla.kernel.org/show_bug.cgi?id=34102
Reported-and-tested-by: Martin Steigerwald 
Signed-off-by: Rafael J. Wysocki

PM / Hibernate: Make default image size depend on total RAM size

2010-10-16T23:57:43+00:00

The default hibernation image size is currently hard coded and euqal
to 500 MB, which is not a reasonable default on many contemporary
systems.  Make it equal 2/5 of the total RAM size (this is slightly
below the maximum, i.e. 1/2 of the total RAM size, and seems to be
generally suitable).

Signed-off-by: Rafael J. Wysocki 
Tested-by: M. Vefa Bicakci

PM / Hibernate: Compress hibernation image with LZO

2010-10-16T23:57:42+00:00

Compress hibernation image with LZO in order to save on I/O and
therefore time to hibernate/thaw.

[rjw: Added hibernate=nocompress command line option instead of just
 nocompress which would be confusing, fixed a couple of compiler
 warnings, fixed kerneldoc comments, minor cleanups.]

Signed-off-by: Bojan Smojver 
Signed-off-by: Rafael J. Wysocki

PM / Hibernate: Separate block_io

2010-05-10T21:08:18+00:00

Move block I/O operations to a separate file. It is because it will
be used later not only by the swap writer.

Signed-off-by: Jiri Slaby 
Signed-off-by: Rafael J. Wysocki

PM / Hibernate: Snapshot cleanup

2010-05-10T21:08:17+00:00

Remove support of reads with offset. This means snapshot_read/write_next
now does not accept count parameter. It allows to clean up the functions
and snapshot handle which no longer needs to care about offsets.

/dev/snapshot handler is converted to simple_{read_from,write_to}_buffer
which take care of offsets.

Signed-off-by: Jiri Slaby 
Acked-by: Pavel Machek 
Signed-off-by: Rafael J. Wysocki

PM/Hibernate: Do not release preallocated memory unnecessarily (rev. 2)

2009-09-14T18:26:58+00:00

Since the hibernation code is now going to use allocations of memory
to make enough room for the image, it can also use the page frames
allocated at this stage as image page frames.  The low-level
hibernation code needs to be rearranged for this purpose, but it
allows us to avoid freeing a great number of pages and allocating
these same pages once again later, so it generally is worth doing.

[rev. 2: Take highmem into account correctly.]

Signed-off-by: Rafael J. Wysocki

PM/Hibernate: Rename disk.c to hibernate.c

2009-06-12T19:32:33+00:00

Change the name of kernel/power/disk.c to kernel/power/hibernate.c
in analogy with the file names introduced by the changes that
separated the suspend to RAM and standby funtionality from the
common PM functions.

Signed-off-by: Rafael J. Wysocki 
Acked-by: Pavel Machek

PM: Separate suspend to RAM functionality from core

2009-06-12T19:32:33+00:00

Move the suspend to RAM and standby code from kernel/power/main.c
to two separate files, kernel/power/suspend.c containing the basic
functions and kernel/power/suspend_test.c containing the automatic
suspend test facility based on the RTC clock alarm.

There are no changes in functionality related to these modifications.

Signed-off-by: Rafael J. Wysocki 
Acked-by: Pavel Machek

PM/Hibernate: Move memory shrinking to snapshot.c (rev. 2)

2009-06-12T19:32:32+00:00

A future patch is going to modify the memory shrinking code so that
it will make memory allocations to free memory instead of using an
artificial memory shrinking mechanism for that.  For this purpose it
is convenient to move swsusp_shrink_memory() from
kernel/power/swsusp.c to kernel/power/snapshot.c, because the new
memory-shrinking code is going to use things that are local to
kernel/power/snapshot.c .

[rev. 2: Make some functions static and remove their headers from
 kernel/power/power.h]

Signed-off-by: Rafael J. Wysocki 
Acked-by: Pavel Machek 
Acked-by: Wu Fengguang

[PATCH] propagate mode through swsusp_close()

2008-10-21T11:49:02+00:00

Signed-off-by: Al Viro