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authorDavid Rientjes <rientjes@google.com>2007-05-02 19:27:09 +0200
committerAndi Kleen <andi@basil.nowhere.org>2007-05-02 19:27:09 +0200
commit14694d736bb66d0ec250d05c81c6e98a19c229c6 (patch)
tree76e752f310859c9904ee772068b2915b138e6572 /arch/x86_64
parent8b8ca80e192b10eecc01fc44a2902510af86f73b (diff)
[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>
Diffstat (limited to 'arch/x86_64')
-rw-r--r--arch/x86_64/mm/numa.c22
1 files changed, 18 insertions, 4 deletions
diff --git a/arch/x86_64/mm/numa.c b/arch/x86_64/mm/numa.c
index c55936bc6be..0ae2d9d5d7e 100644
--- a/arch/x86_64/mm/numa.c
+++ b/arch/x86_64/mm/numa.c
@@ -418,11 +418,25 @@ static int __init numa_emulation(unsigned long start_pfn, unsigned long end_pfn)
done:
if (!num_nodes)
return -1;
- /* Fill remainder of system RAM with a final node, if appropriate. */
+ /* Fill remainder of system RAM, if appropriate. */
if (addr < max_addr) {
- setup_node_range(num_nodes, nodes, &addr, max_addr - addr,
- max_addr);
- num_nodes++;
+ switch (*(cmdline - 1)) {
+ case '*':
+ /* Split remaining nodes into coeff chunks */
+ if (coeff <= 0)
+ break;
+ num_nodes += split_nodes_equally(nodes, &addr, max_addr,
+ num_nodes, coeff);
+ break;
+ case ',':
+ /* Do not allocate remaining system RAM */
+ break;
+ default:
+ /* Give one final node */
+ setup_node_range(num_nodes, nodes, &addr,
+ max_addr - addr, max_addr);
+ num_nodes++;
+ }
}
out:
memnode_shift = compute_hash_shift(nodes, num_nodes);