From af017a1189737195284387526e2f474a35e4119c Mon Sep 17 00:00:00 2001 From: Anton Blanchard Date: Tue, 31 Mar 2009 15:23:19 -0700 Subject: [PATCH] mm: enable hashdist by default on 64bit NUMA On PowerPC we allocate large boot time hashes on node 0. This leads to an imbalance in the free memory, for example on a 64GB box (4 x 16GB nodes): Free memory: Node 0: 97.03% Node 1: 98.54% Node 2: 98.42% Node 3: 98.53% If we switch to using vmalloc (like ia64 and x86-64) things are more balanced: Free memory: Node 0: 97.53% Node 1: 98.35% Node 2: 98.33% Node 3: 98.33% For many HPC applications we are limited by the free available memory on the smallest node, so even though the same amount of memory is used the better balancing helps. Since all 64bit NUMA capable architectures should have sufficient vmalloc space, it makes sense to enable it via CONFIG_64BIT. Signed-off-by: Anton Blanchard Acked-by: David S. Miller Acked-by: Benjamin Herrenschmidt Acked-by: Ralf Baechle Cc: Heiko Carstens Cc: Martin Schwidefsky Cc: Ivan Kokshaysky Cc: Richard Henderson Signed-off-by: Andrew Morton Signed-off-by: Linus Torvalds --- include/linux/bootmem.h | 6 +++--- 1 file changed, 3 insertions(+), 3 deletions(-) diff --git a/include/linux/bootmem.h b/include/linux/bootmem.h index 455d83219fae5..bc3ab70736955 100644 --- a/include/linux/bootmem.h +++ b/include/linux/bootmem.h @@ -146,10 +146,10 @@ extern void *alloc_large_system_hash(const char *tablename, #define HASH_EARLY 0x00000001 /* Allocating during early boot? */ -/* Only NUMA needs hash distribution. - * IA64 and x86_64 have sufficient vmalloc space. +/* Only NUMA needs hash distribution. 64bit NUMA architectures have + * sufficient vmalloc space. */ -#if defined(CONFIG_NUMA) && (defined(CONFIG_IA64) || defined(CONFIG_X86_64)) +#if defined(CONFIG_NUMA) && defined(CONFIG_64BIT) #define HASHDIST_DEFAULT 1 #else #define HASHDIST_DEFAULT 0 -- 2.39.5