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s390/mm: zero page cache synonyms for zEC12 

To avoid cache synonyms on System zEC12 32 independent zero pages are
required, one for each combination for bits 2**12 to 2**16 of the virtual
address. To avoid wasting too much memory on small virtual systems the
number of zero pages is limited to 4 if the memory size is less or equal
to 64MB.

Signed-off-by: Martin Schwidefsky <schwidefsky@de.ibm.com>
This commit is contained in:
Martin Schwidefsky 2013-02-28 11:08:54 +01:00
parent f752ac4d7d
commit 7919e91b34
1 changed files with 9 additions and 1 deletions
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10
arch/s390/mm/init.c
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@ -63,10 +63,18 @@ static unsigned long __init setup_zero_pages(void)
break;
case 0x2097: /* z10 */
case 0x2098: /* z10 */
default:
case 0x2817: /* z196 */
case 0x2818: /* z196 */
order = 2;
break;
case 0x2827: /* zEC12 */
default:
order = 5;
break;
}
/* Limit number of empty zero pages for small memory sizes */
if (order > 2 && totalram_pages <= 16384)
order = 2;
empty_zero_page = __get_free_pages(GFP_KERNEL | __GFP_ZERO, order);
if (!empty_zero_page)