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numa: convert static memory to dynamically allocated memory for per node device 

We use a static array to store struct node.  In many cases, we don't have
too many nodes, and some memory will be unused.  Convert it to per-device
dynamically allocated memory.

Signed-off-by: Wen Congyang <wency@cn.fujitsu.com>
Cc: David Rientjes <rientjes@google.com>
Cc: Jiang Liu <liuj97@gmail.com>
Cc: Minchan Kim <minchan.kim@gmail.com>
Cc: KOSAKI Motohiro <kosaki.motohiro@jp.fujitsu.com>
Cc: Yasuaki Ishimatsu <isimatu.yasuaki@jp.fujitsu.com>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
This commit is contained in:
Wen Congyang 2012-12-11 16:00:56 -08:00 committed by Linus Torvalds
parent 97d0da2204
commit 8732794b16
4 changed files with 27 additions and 21 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

4
arch/powerpc/kernel/sysfs.c
View File

@ -607,7 +607,7 @@ static void register_nodes(void)
int sysfs_add_device_to_node(struct device *dev, int nid)
{
struct node *node = &node_devices[nid];
struct node *node = node_devices[nid];
return sysfs_create_link(&node->dev.kobj, &dev->kobj,
kobject_name(&dev->kobj));
}
@ -615,7 +615,7 @@ EXPORT_SYMBOL_GPL(sysfs_add_device_to_node);
void sysfs_remove_device_from_node(struct device *dev, int nid)
{
struct node *node = &node_devices[nid];
struct node *node = node_devices[nid];
sysfs_remove_link(&node->dev.kobj, kobject_name(&dev->kobj));
}
EXPORT_SYMBOL_GPL(sysfs_remove_device_from_node);

38
drivers/base/node.c
View File

@ -306,7 +306,7 @@ void unregister_node(struct node *node)
device_unregister(&node->dev);
}
struct node node_devices[MAX_NUMNODES];
struct node *node_devices[MAX_NUMNODES];
/*
* register cpu under node
@ -323,15 +323,15 @@ int register_cpu_under_node(unsigned int cpu, unsigned int nid)
if (!obj)
return 0;
ret = sysfs_create_link(&node_devices[nid].dev.kobj,
ret = sysfs_create_link(&node_devices[nid]->dev.kobj,
&obj->kobj,
kobject_name(&obj->kobj));
if (ret)
return ret;
return sysfs_create_link(&obj->kobj,
&node_devices[nid].dev.kobj,
kobject_name(&node_devices[nid].dev.kobj));
&node_devices[nid]->dev.kobj,
kobject_name(&node_devices[nid]->dev.kobj));
}
int unregister_cpu_under_node(unsigned int cpu, unsigned int nid)
@ -345,10 +345,10 @@ int unregister_cpu_under_node(unsigned int cpu, unsigned int nid)
if (!obj)
return 0;
sysfs_remove_link(&node_devices[nid].dev.kobj,
sysfs_remove_link(&node_devices[nid]->dev.kobj,
kobject_name(&obj->kobj));
sysfs_remove_link(&obj->kobj,
kobject_name(&node_devices[nid].dev.kobj));
kobject_name(&node_devices[nid]->dev.kobj));
return 0;
}
@ -390,15 +390,15 @@ int register_mem_sect_under_node(struct memory_block *mem_blk, int nid)
continue;
if (page_nid != nid)
continue;
ret = sysfs_create_link_nowarn(&node_devices[nid].dev.kobj,
ret = sysfs_create_link_nowarn(&node_devices[nid]->dev.kobj,
&mem_blk->dev.kobj,
kobject_name(&mem_blk->dev.kobj));
if (ret)
return ret;
return sysfs_create_link_nowarn(&mem_blk->dev.kobj,
&node_devices[nid].dev.kobj,
kobject_name(&node_devices[nid].dev.kobj));
&node_devices[nid]->dev.kobj,
kobject_name(&node_devices[nid]->dev.kobj));
}
/* mem section does not span the specified node */
return 0;
@ -431,10 +431,10 @@ int unregister_mem_sect_under_nodes(struct memory_block *mem_blk,
continue;
if (node_test_and_set(nid, *unlinked_nodes))
continue;
sysfs_remove_link(&node_devices[nid].dev.kobj,
sysfs_remove_link(&node_devices[nid]->dev.kobj,
kobject_name(&mem_blk->dev.kobj));
sysfs_remove_link(&mem_blk->dev.kobj,
kobject_name(&node_devices[nid].dev.kobj));
kobject_name(&node_devices[nid]->dev.kobj));
}
NODEMASK_FREE(unlinked_nodes);
return 0;
@ -500,7 +500,7 @@ static void node_hugetlb_work(struct work_struct *work)
static void init_node_hugetlb_work(int nid)
{
INIT_WORK(&node_devices[nid].node_work, node_hugetlb_work);
INIT_WORK(&node_devices[nid]->node_work, node_hugetlb_work);
}
static int node_memory_callback(struct notifier_block *self,
@ -517,7 +517,7 @@ static int node_memory_callback(struct notifier_block *self,
* when transitioning to/from memoryless state.
*/
if (nid != NUMA_NO_NODE)
schedule_work(&node_devices[nid].node_work);
schedule_work(&node_devices[nid]->node_work);
break;
case MEM_GOING_ONLINE:
@ -558,9 +558,13 @@ int register_one_node(int nid)
struct node *parent = NULL;
if (p_node != nid)
parent = &node_devices[p_node];
parent = node_devices[p_node];
error = register_node(&node_devices[nid], nid, parent);
node_devices[nid] = kzalloc(sizeof(struct node), GFP_KERNEL);
if (!node_devices[nid])
return -ENOMEM;
error = register_node(node_devices[nid], nid, parent);
/* link cpu under this node */
for_each_present_cpu(cpu) {
@ -581,7 +585,9 @@ int register_one_node(int nid)
void unregister_one_node(int nid)
{
unregister_node(&node_devices[nid]);
unregister_node(node_devices[nid]);
kfree(node_devices[nid]);
node_devices[nid] = NULL;
}
/*

2
include/linux/node.h
View File

@ -27,7 +27,7 @@ struct node {
};
struct memory_block;
extern struct node node_devices[];
extern struct node *node_devices[];
typedef void (*node_registration_func_t)(struct node *);
extern int register_node(struct node *, int, struct node *);

4
mm/hugetlb.c
View File

@ -1800,7 +1800,7 @@ static void hugetlb_unregister_all_nodes(void)
* remove hstate attributes from any nodes that have them.
*/
for (nid = 0; nid < nr_node_ids; nid++)
hugetlb_unregister_node(&node_devices[nid]);
hugetlb_unregister_node(node_devices[nid]);
}
/*
@ -1845,7 +1845,7 @@ static void hugetlb_register_all_nodes(void)
int nid;
for_each_node_state(nid, N_HIGH_MEMORY) {
struct node *node = &node_devices[nid];
struct node *node = node_devices[nid];
if (node->dev.id == nid)
hugetlb_register_node(node);
}