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Commit 13870b65 authored by Anton Blanchard's avatar Anton Blanchard Committed by Benjamin Herrenschmidt
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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: default avatarAnton Blanchard <anton@samba.org>
Signed-off-by: default avatarBenjamin Herrenschmidt <benh@kernel.crashing.org>
parent 33f00dce

arch/powerpc/mm/hash_utils_64.c

+3 −2
Original line number Diff line number Diff line
@@ -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;

}