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Date: Wed, 22 Aug 2012 16:59:13 +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 29/36] autonuma: autonuma_migrate_head[0] dynamic size
Reduce the autonuma_migrate_head array entries from MAX_NUMNODES to
num_possible_nodes() or zero if autonuma is not possible.
Signed-off-by: Andrea Arcangeli <aarcange@...hat.com>
---
arch/x86/mm/numa.c | 6 ++++--
arch/x86/mm/numa_32.c | 3 ++-
include/linux/memory_hotplug.h | 3 ++-
include/linux/mmzone.h | 19 +++++++++++++------
include/linux/page_autonuma.h | 10 ++++++++--
mm/memory_hotplug.c | 2 +-
6 files changed, 30 insertions(+), 13 deletions(-)
diff --git a/arch/x86/mm/numa.c b/arch/x86/mm/numa.c
index 2d125be..a4a9e92 100644
--- a/arch/x86/mm/numa.c
+++ b/arch/x86/mm/numa.c
@@ -11,6 +11,7 @@
#include <linux/nodemask.h>
#include <linux/sched.h>
#include <linux/topology.h>
+#include <linux/page_autonuma.h>
#include <asm/e820.h>
#include <asm/proto.h>
@@ -192,7 +193,8 @@ int __init numa_add_memblk(int nid, u64 start, u64 end)
/* Initialize NODE_DATA for a node on the local memory */
static void __init setup_node_data(int nid, u64 start, u64 end)
{
- const size_t nd_size = roundup(sizeof(pg_data_t), PAGE_SIZE);
+ const size_t nd_size = roundup(autonuma_pglist_data_size(),
+ PAGE_SIZE);
bool remapped = false;
u64 nd_pa;
void *nd;
@@ -239,7 +241,7 @@ static void __init setup_node_data(int nid, u64 start, u64 end)
printk(KERN_INFO " NODE_DATA(%d) on node %d\n", nid, tnid);
node_data[nid] = nd;
- memset(NODE_DATA(nid), 0, sizeof(pg_data_t));
+ memset(NODE_DATA(nid), 0, autonuma_pglist_data_size());
NODE_DATA(nid)->node_id = nid;
NODE_DATA(nid)->node_start_pfn = start >> PAGE_SHIFT;
NODE_DATA(nid)->node_spanned_pages = (end - start) >> PAGE_SHIFT;
diff --git a/arch/x86/mm/numa_32.c b/arch/x86/mm/numa_32.c
index 534255a..d32d6cc 100644
--- a/arch/x86/mm/numa_32.c
+++ b/arch/x86/mm/numa_32.c
@@ -25,6 +25,7 @@
#include <linux/bootmem.h>
#include <linux/memblock.h>
#include <linux/module.h>
+#include <linux/page_autonuma.h>
#include "numa_internal.h"
@@ -194,7 +195,7 @@ void __init init_alloc_remap(int nid, u64 start, u64 end)
/* calculate the necessary space aligned to large page size */
size = node_memmap_size_bytes(nid, start_pfn, end_pfn);
- size += ALIGN(sizeof(pg_data_t), PAGE_SIZE);
+ size += ALIGN(autonuma_pglist_data_size(), PAGE_SIZE);
size = ALIGN(size, LARGE_PAGE_BYTES);
/* allocate node memory and the lowmem remap area */
diff --git a/include/linux/memory_hotplug.h b/include/linux/memory_hotplug.h
index 910550f..76b1840 100644
--- a/include/linux/memory_hotplug.h
+++ b/include/linux/memory_hotplug.h
@@ -5,6 +5,7 @@
#include <linux/spinlock.h>
#include <linux/notifier.h>
#include <linux/bug.h>
+#include <linux/page_autonuma.h>
struct page;
struct zone;
@@ -130,7 +131,7 @@ extern void arch_refresh_nodedata(int nid, pg_data_t *pgdat);
*/
#define generic_alloc_nodedata(nid) \
({ \
- kzalloc(sizeof(pg_data_t), GFP_KERNEL); \
+ kzalloc(autonuma_pglist_data_size(), GFP_KERNEL); \
})
/*
* This definition is just for error path in node hotadd.
diff --git a/include/linux/mmzone.h b/include/linux/mmzone.h
index 853e236..4d8e100 100644
--- a/include/linux/mmzone.h
+++ b/include/linux/mmzone.h
@@ -713,12 +713,6 @@ typedef struct pglist_data {
#if !defined(CONFIG_SPARSEMEM)
struct page_autonuma *node_page_autonuma;
#endif
- /*
- * All pages from node "page_nid" to be migrated to this node,
- * will be queued into the list
- * autonuma_migrate_head[page_nid].
- */
- struct list_head autonuma_migrate_head[MAX_NUMNODES];
/* number of pages from other nodes queued for migration to this node */
unsigned long autonuma_nr_migrate_pages;
/* waitqueue for this node knuma_migrated daemon */
@@ -729,7 +723,20 @@ typedef struct pglist_data {
* autonuma_nr_migrate_pages field.
*/
spinlock_t autonuma_lock;
+ /*
+ * All pages from node "page_nid" to be migrated to this node,
+ * will be queued into the list
+ * autonuma_migrate_head[page_nid].
+ *
+ * Arches supporting AutoNUMA must allocate the pgdat
+ * structure using the size returned from the
+ * autonuma_pglist_data_size() function after including
+ * <linux/page_autonuma.h>. The below field must remain the
+ * last one of this structure.
+ */
+ struct list_head autonuma_migrate_head[0];
#endif
+ /* do not add more variables here, the above array size is dynamic */
} pg_data_t;
#define node_present_pages(nid) (NODE_DATA(nid)->node_present_pages)
diff --git a/include/linux/page_autonuma.h b/include/linux/page_autonuma.h
index 9763e61..bd6249c 100644
--- a/include/linux/page_autonuma.h
+++ b/include/linux/page_autonuma.h
@@ -10,6 +10,7 @@ static inline void __init page_autonuma_init_flatmem(void) {}
#ifdef CONFIG_AUTONUMA
#include <linux/autonuma_flags.h>
+#include <linux/autonuma_types.h>
extern void __meminit page_autonuma_map_init(struct page *page,
struct page_autonuma *page_autonuma,
@@ -29,11 +30,10 @@ extern void __meminit pgdat_autonuma_init(struct pglist_data *);
struct page_autonuma;
#define PAGE_AUTONUMA_SIZE 0
#define SECTION_PAGE_AUTONUMA_SIZE 0
+#endif /* CONFIG_SPARSEMEM */
#define autonuma_possible() false
-#endif /* CONFIG_SPARSEMEM */
-
static inline void pgdat_autonuma_init(struct pglist_data *pgdat) {}
#endif /* CONFIG_AUTONUMA */
@@ -50,4 +50,10 @@ extern void __init sparse_early_page_autonuma_alloc_node(struct page_autonuma **
int nodeid);
#endif
+/* inline won't work here */
+#define autonuma_pglist_data_size() (sizeof(struct pglist_data) + \
+ (autonuma_possible() ? \
+ sizeof(struct list_head) * \
+ nr_node_ids : 0))
+
#endif /* _LINUX_PAGE_AUTONUMA_H */
diff --git a/mm/memory_hotplug.c b/mm/memory_hotplug.c
index 3ad25f9..86b37db 100644
--- a/mm/memory_hotplug.c
+++ b/mm/memory_hotplug.c
@@ -164,7 +164,7 @@ void register_page_bootmem_info_node(struct pglist_data *pgdat)
struct page *page;
struct zone *zone;
- nr_pages = PAGE_ALIGN(sizeof(struct pglist_data)) >> PAGE_SHIFT;
+ nr_pages = PAGE_ALIGN(autonuma_pglist_data_size()) >> PAGE_SHIFT;
page = virt_to_page(pgdat);
for (i = 0; i < nr_pages; i++, page++)
--
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