From: Anton Blanchard Date: Fri, 13 Feb 2009 11:57:30 +0000 (+0000) Subject: powerpc/mm: Reduce hashtable size when using 64kB pages X-Git-Tag: v2.6.30-rc1~619^2~91 X-Git-Url: https://openfabrics.org/gitweb/?a=commitdiff_plain;h=13870b657578bcce167978ee93dc02bf54e3beb0;p=~emulex%2Finfiniband.git powerpc/mm: Reduce hashtable size when using 64kB pages At the moment we size the hashtable based on 4kB pages / 2, even on a 64kB kernel. This results in a hashtable that is much larger than it needs to be. Grab the real page size and size the hashtable based on that Note: This only has effect on non hypervisor machines. Signed-off-by: Anton Blanchard Signed-off-by: Benjamin Herrenschmidt --- diff --git a/arch/powerpc/mm/hash_utils_64.c b/arch/powerpc/mm/hash_utils_64.c index 8d5b4758c13..f5bc1b213f2 100644 --- a/arch/powerpc/mm/hash_utils_64.c +++ b/arch/powerpc/mm/hash_utils_64.c @@ -516,7 +516,7 @@ static int __init htab_dt_scan_pftsize(unsigned long node, static unsigned long __init htab_get_table_size(void) { - unsigned long mem_size, rnd_mem_size, pteg_count; + unsigned long mem_size, rnd_mem_size, pteg_count, psize; /* If hash size isn't already provided by the platform, we try to * retrieve it from the device-tree. If it's not there neither, we @@ -534,7 +534,8 @@ static unsigned long __init htab_get_table_size(void) rnd_mem_size <<= 1; /* # pages / 2 */ - pteg_count = max(rnd_mem_size >> (12 + 1), 1UL << 11); + psize = mmu_psize_defs[mmu_virtual_psize].shift; + pteg_count = max(rnd_mem_size >> (psize + 1), 1UL << 11); return pteg_count << 7; }