[PATCH] x86-64: split remaining fake nodes equally

Extends the numa=fake x86_64 command-line option to split the remaining
system memory into equal-sized nodes.

For example:
numa=fake=2*512,4*	gives two 512M nodes and the remaining system
			memory is split into four approximately equal
			chunks.

This is beneficial for systems where the exact size of RAM is unknown or not
necessarily relevant, but the granularity with which nodes shall be allocated
is known.

Cc: Andi Kleen <ak@suse.de>
Signed-off-by: David Rientjes <rientjes@google.com>
Signed-off-by: Andi Kleen <ak@suse.de>
Cc: Paul Jackson <pj@sgi.com>
Cc: Christoph Lameter <clameter@engr.sgi.com>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>

1 files changed, 3 insertions, 1 deletions

diff --git a/Documentation/x86_64/boot-options.txt b/Documentation/x86_64/boot-options.txt
index 7500aad95f3c..12a9aacecaae 100644
--- a/Documentation/x86_64/boot-options.txt
+++ b/Documentation/x86_64/boot-options.txt
@@ -155,7 +155,9 @@ NUMA
                 depending on the sizes and coefficients listed.  For example:
                         numa=fake=2*512,1024,4*256
                 gives two 512M nodes, a 1024M node, and four 256M nodes.  The
-                remaining system RAM is allocated to an additional node.
+                remaining system RAM is allocated to an additional node.  If
+                the last character of CMDLINE is a *, the remaining system RAM
+                is instead divided up equally among its coefficient.
 
   numa=hotadd=percent
                 Only allow hotadd memory to preallocate page structures upto