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authorAnton Blanchard <anton@samba.org>2009-02-13 11:57:30 +0000
committerBenjamin Herrenschmidt <benh@kernel.crashing.org>2009-02-23 10:48:58 +1100
commit13870b657578bcce167978ee93dc02bf54e3beb0 (patch)
treec7c5ece57c707eacf465af5b954c7b4234b71d96 /arch/powerpc/mm/hash_utils_64.c
parent33f00dcedb0e22cdb156a23632814fc580fcfcf8 (diff)
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 <anton@samba.org> Signed-off-by: Benjamin Herrenschmidt <benh@kernel.crashing.org>
Diffstat (limited to 'arch/powerpc/mm/hash_utils_64.c')
-rw-r--r--arch/powerpc/mm/hash_utils_64.c5
1 files changed, 3 insertions, 2 deletions
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;
}