Add documentation for --window-memory, pack.windowMemory

Signed-off-by: NBrian Downing <bdowning@lavos.net>
Acked-by: NNicolas Pitre <nico@cam.org>
Signed-off-by: NJunio C Hamano <gitster@pobox.com>

Documentation/config.txt

@@ -589,6 +589,12 @@ pack.depth::
 	The maximum delta depth used by gitlink:git-pack-objects[1] when no
 	maximum depth is given on the command line. Defaults to 50.
 
+pack.windowMemory::
+	The window memory size limit used by gitlink:git-pack-objects[1]
+	when no limit is given on the command line.  The value can be
+	suffixed with "k", "m", or "g".  Defaults to 0, meaning no
+	limit.
+
 pack.compression::
 	An integer -1..9, indicating the compression level for objects
 	in a pack file. -1 is the zlib default. 0 means no

Documentation/git-pack-objects.txt

@@ -85,6 +85,17 @@ base-name::
 	times to get to the necessary object.
 	The default value for --window is 10 and --depth is 50.
 
+--window-memory=[N]::
+	This option provides an additional limit on top of `--window`;
+	the window size will dynamically scale down so as to not take
+	up more than N bytes in memory.  This is useful in
+	repositories with a mix of large and small objects to not run
+	out of memory with a large window, but still be able to take
+	advantage of the large window for the smaller objects.  The
+	size can be suffixed with "k", "m", or "g".
+	`--window-memory=0` makes memory usage unlimited, which is the
+	default.
+
 --max-pack-size=<n>::
 	Maximum size of each output packfile, expressed in MiB.
 	If specified,  multiple packfiles may be created.

Documentation/git-repack.txt

@@ -68,6 +68,17 @@ OPTIONS
 	to be applied that many times to get to the necessary object.
 	The default value for --window is 10 and --depth is 50.
 
+--window-memory=[N]::
+	This option provides an additional limit on top of `--window`;
+	the window size will dynamically scale down so as to not take
+	up more than N bytes in memory.  This is useful in
+	repositories with a mix of large and small objects to not run
+	out of memory with a large window, but still be able to take
+	advantage of the large window for the smaller objects.  The
+	size can be suffixed with "k", "m", or "g".
+	`--window-memory=0` makes memory usage unlimited, which is the
+	default.
+
 --max-pack-size=<n>::
 	Maximum size of each output packfile, expressed in MiB.
 	If specified,  multiple packfiles may be created.