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authorAnton Blanchard <anton@samba.org>2009-09-21 19:56:43 +0000
committerBenjamin Herrenschmidt <benh@kernel.crashing.org>2009-09-24 15:31:46 +1000
commitea55bf29126f0066a4e82a8545437494ff4fc431 (patch)
tree53259bbb7c3984f53fd0026fd5867a1322b36685
parentf2053f1a7bf6005b4e81826b1ac8d0b4117c4cf0 (diff)
powerpc: Increase NODES_SHIFT on 64bit from 4 to 8
Some System p configurations can already have more than 16 nodes so we need to increase NODES_SHIFT. I chose 256 to give us some room to grow in the future, although we can look at something smaller if the memory bloat is considered too much. Unless we clamp MAX_ACTIVE_REGIONS we end up with 300kB of extra bloat in early_node_map in mm/page_alloc.c: < 6144 early_node_map > 307200 early_node_map due to: #if MAX_NUMNODES >= 32 /* If there can be many nodes, allow up to 50 holes per node */ #define MAX_ACTIVE_REGIONS (MAX_NUMNODES*50) #else /* By default, allow up to 256 distinct regions */ #define MAX_ACTIVE_REGIONS 256 Since our memory is mostly contiguous it seems reasonable to keep this at 256 for now. I also set 32bit to 32 to save space (is there any chance a 32bit system will have more than 32 discontiguous memory ranges?). Even with that fixed we have a few data structures that grow: < 896 bootmem_node_data > 14336 bootmem_node_data < 1280 node_devices > 20480 node_devices < 25088 kmalloc_caches > 59648 kmalloc_caches < 1632 hstates > 21792 hstates Signed-off-by: Anton Blanchard <anton@samba.org> Signed-off-by: Benjamin Herrenschmidt <benh@kernel.crashing.org>
-rw-r--r--arch/powerpc/Kconfig6
1 files changed, 6 insertions, 0 deletions
diff --git a/arch/powerpc/Kconfig b/arch/powerpc/Kconfig
index 4fd479059d6..10a0a5488a4 100644
--- a/arch/powerpc/Kconfig
+++ b/arch/powerpc/Kconfig
@@ -385,9 +385,15 @@ config NUMA
config NODES_SHIFT
int
+ default "8" if PPC64
default "4"
depends on NEED_MULTIPLE_NODES
+config MAX_ACTIVE_REGIONS
+ int
+ default "256" if PPC64
+ default "32"
+
config ARCH_SELECT_MEMORY_MODEL
def_bool y
depends on PPC64