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| author | Martin Schwidefsky <schwidefsky@de.ibm.com> | 2013-02-28 14:08:54 +0400 |
|---|---|---|
| committer | Martin Schwidefsky <schwidefsky@de.ibm.com> | 2013-04-17 16:07:24 +0400 |
| commit | 7919e91b34316ee30b14334389e005eb2e9b8e39 (patch) | |
| tree | 8a4e0583cd0ef46d27e4725c58ece70f3253a3ad /arch/s390/mm | |
| parent | f752ac4d7d96159776b0eea47489796bd90856fd (diff) | |
| download | linux-7919e91b34316ee30b14334389e005eb2e9b8e39.tar.xz | |
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>
Diffstat (limited to 'arch/s390/mm')
| -rw-r--r-- | arch/s390/mm/init.c | 10 |
1 files changed, 9 insertions, 1 deletions
diff --git a/arch/s390/mm/init.c b/arch/s390/mm/init.c index 49ce6bb2c641..9f9c315b4c07 100644 --- a/arch/s390/mm/init.c +++ b/arch/s390/mm/init.c @@ -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) |