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powerpc/mm: Reduce hashtable size when using 64kB pages

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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>
This commit is contained in:
Anton Blanchard 2009-02-13 11:57:30 +00:00 committed by Benjamin Herrenschmidt
parent 33f00dcedb
commit 13870b6575
1 changed files with 3 additions and 2 deletions
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5
arch/powerpc/mm/hash_utils_64.c
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@ -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;
}