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Date: Wed, 22 Aug 2012 16:59:17 +0200
From: Andrea Arcangeli <aarcange@...hat.com>
To: linux-kernel@...r.kernel.org, linux-mm@...ck.org
Cc: Hillf Danton <dhillf@...il.com>, Dan Smith <danms@...ibm.com>,
Linus Torvalds <torvalds@...ux-foundation.org>,
Andrew Morton <akpm@...ux-foundation.org>,
Thomas Gleixner <tglx@...utronix.de>,
Ingo Molnar <mingo@...e.hu>, Paul Turner <pjt@...gle.com>,
Suresh Siddha <suresh.b.siddha@...el.com>,
Mike Galbraith <efault@....de>,
"Paul E. McKenney" <paulmck@...ux.vnet.ibm.com>,
Lai Jiangshan <laijs@...fujitsu.com>,
Bharata B Rao <bharata.rao@...il.com>,
Lee Schermerhorn <Lee.Schermerhorn@...com>,
Rik van Riel <riel@...hat.com>,
Johannes Weiner <hannes@...xchg.org>,
Srivatsa Vaddagiri <vatsa@...ux.vnet.ibm.com>,
Christoph Lameter <cl@...ux.com>,
Alex Shi <alex.shi@...el.com>,
Mauricio Faria de Oliveira <mauricfo@...ux.vnet.ibm.com>,
Konrad Rzeszutek Wilk <konrad.wilk@...cle.com>,
Don Morris <don.morris@...com>,
Benjamin Herrenschmidt <benh@...nel.crashing.org>
Subject: [PATCH 33/36] autonuma: powerpc port
From: Vaidyanathan Srinivasan <svaidy@...ux.vnet.ibm.com>
* PMD flaging is not required in powerpc since large pages
are tracked in ptes.
* Yet to be tested with large pages
* This is an initial patch that partially works
* knuma_scand and numa hinting page faults works
* Page migration is yet to be observed/verified
Signed-off-by: Vaidyanathan Srinivasan <svaidy@...ux.vnet.ibm.com>
Signed-off-by: Andrea Arcangeli <aarcange@...hat.com>
---
arch/powerpc/include/asm/pgtable.h | 48 ++++++++++++++++++++++++++++-
arch/powerpc/include/asm/pte-hash64-64k.h | 4 ++-
arch/powerpc/mm/numa.c | 3 +-
mm/autonuma.c | 2 +-
4 files changed, 53 insertions(+), 4 deletions(-)
diff --git a/arch/powerpc/include/asm/pgtable.h b/arch/powerpc/include/asm/pgtable.h
index 2e0e411..5f03079 100644
--- a/arch/powerpc/include/asm/pgtable.h
+++ b/arch/powerpc/include/asm/pgtable.h
@@ -33,10 +33,56 @@ static inline int pte_dirty(pte_t pte) { return pte_val(pte) & _PAGE_DIRTY; }
static inline int pte_young(pte_t pte) { return pte_val(pte) & _PAGE_ACCESSED; }
static inline int pte_file(pte_t pte) { return pte_val(pte) & _PAGE_FILE; }
static inline int pte_special(pte_t pte) { return pte_val(pte) & _PAGE_SPECIAL; }
-static inline int pte_present(pte_t pte) { return pte_val(pte) & _PAGE_PRESENT; }
+static inline int pte_present(pte_t pte) { return pte_val(pte) &
+ (_PAGE_PRESENT|_PAGE_NUMA_PTE); }
static inline int pte_none(pte_t pte) { return (pte_val(pte) & ~_PTE_NONE_MASK) == 0; }
static inline pgprot_t pte_pgprot(pte_t pte) { return __pgprot(pte_val(pte) & PAGE_PROT_BITS); }
+#ifdef CONFIG_AUTONUMA
+static inline int pte_numa(pte_t pte)
+{
+ return (pte_val(pte) &
+ (_PAGE_NUMA_PTE|_PAGE_PRESENT)) == _PAGE_NUMA_PTE;
+}
+
+#endif
+
+static inline pte_t pte_mknonnuma(pte_t pte)
+{
+ pte_val(pte) &= ~_PAGE_NUMA_PTE;
+ pte_val(pte) |= (_PAGE_PRESENT|_PAGE_ACCESSED);
+
+ return pte;
+}
+
+static inline pte_t pte_mknuma(pte_t pte)
+{
+ pte_val(pte) |= _PAGE_NUMA_PTE;
+ pte_val(pte) &= ~_PAGE_PRESENT;
+ return pte;
+}
+
+static inline int pmd_numa(pmd_t pmd)
+{
+ /* PMD tracking not implemented */
+ return 0;
+}
+
+static inline pmd_t pmd_mknonnuma(pmd_t pmd)
+{
+ BUG();
+ return pmd;
+}
+
+static inline pmd_t pmd_mknuma(pmd_t pmd)
+{
+ BUG();
+ return pmd;
+}
+
+/* No pmd flags on powerpc */
+#define set_pmd_at(mm, addr, pmdp, pmd) do { } while (0)
+
/* Conversion functions: convert a page and protection to a page entry,
* and a page entry and page directory to the page they refer to.
*
diff --git a/arch/powerpc/include/asm/pte-hash64-64k.h b/arch/powerpc/include/asm/pte-hash64-64k.h
index 59247e8..f7e1468 100644
--- a/arch/powerpc/include/asm/pte-hash64-64k.h
+++ b/arch/powerpc/include/asm/pte-hash64-64k.h
@@ -7,6 +7,8 @@
#define _PAGE_COMBO 0x10000000 /* this is a combo 4k page */
#define _PAGE_4K_PFN 0x20000000 /* PFN is for a single 4k page */
+#define _PAGE_NUMA_PTE 0x40000000 /* Adjust PTE_RPN_SHIFT below */
+
/* For 64K page, we don't have a separate _PAGE_HASHPTE bit. Instead,
* we set that to be the whole sub-bits mask. The C code will only
* test this, so a multi-bit mask will work. For combo pages, this
@@ -36,7 +38,7 @@
* That gives us a max RPN of 34 bits, which means a max of 50 bits
* of addressable physical space, or 46 bits for the special 4k PFNs.
*/
-#define PTE_RPN_SHIFT (30)
+#define PTE_RPN_SHIFT (31)
#ifndef __ASSEMBLY__
diff --git a/arch/powerpc/mm/numa.c b/arch/powerpc/mm/numa.c
index 39b1597..80af41e 100644
--- a/arch/powerpc/mm/numa.c
+++ b/arch/powerpc/mm/numa.c
@@ -22,6 +22,7 @@
#include <linux/pfn.h>
#include <linux/cpuset.h>
#include <linux/node.h>
+#include <linux/page_autonuma.h>
#include <asm/sparsemem.h>
#include <asm/prom.h>
#include <asm/smp.h>
@@ -1045,7 +1046,7 @@ void __init do_init_bootmem(void)
* all reserved areas marked.
*/
NODE_DATA(nid) = careful_zallocation(nid,
- sizeof(struct pglist_data),
+ autonuma_pglist_data_size(),
SMP_CACHE_BYTES, end_pfn);
dbg("node %d\n", nid);
diff --git a/mm/autonuma.c b/mm/autonuma.c
index ada6c57..a4da3f3 100644
--- a/mm/autonuma.c
+++ b/mm/autonuma.c
@@ -25,7 +25,7 @@ unsigned long autonuma_flags __read_mostly =
#ifdef CONFIG_AUTONUMA_DEFAULT_ENABLED
|(1<<AUTONUMA_ENABLED_FLAG)
#endif
- |(1<<AUTONUMA_SCAN_PMD_FLAG);
+ |(0<<AUTONUMA_SCAN_PMD_FLAG);
static DEFINE_MUTEX(knumad_mm_mutex);
--
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