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memory-hotplug: remove sysfs file of node

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Introduce a new function try_offline_node() to remove sysfs file of node
when all memory sections of this node are removed.  If some memory
sections of this node are not removed, this function does nothing.

Signed-off-by: Wen Congyang <wency@cn.fujitsu.com>
Signed-off-by: Tang Chen <tangchen@cn.fujitsu.com>
Cc: KOSAKI Motohiro <kosaki.motohiro@jp.fujitsu.com>
Cc: Jiang Liu <jiang.liu@huawei.com>
Cc: Jianguo Wu <wujianguo@huawei.com>
Cc: Kamezawa Hiroyuki <kamezawa.hiroyu@jp.fujitsu.com>
Cc: Lai Jiangshan <laijs@cn.fujitsu.com>
Cc: Wu Jianguo <wujianguo@huawei.com>
Cc: Yasuaki Ishimatsu <isimatu.yasuaki@jp.fujitsu.com>
Cc: Ingo Molnar <mingo@elte.hu>
Cc: Thomas Gleixner <tglx@linutronix.de>
Cc: "H. Peter Anvin" <hpa@zytor.com>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
This commit is contained in:
Tang Chen 2013-02-22 16:33:14 -08:00 • committed by Linus Torvalds
parent 815121d2b5
commit 60a5a19e74
3 changed files with 63 additions and 5 deletions
Download patch file Download diff file Expand all files Collapse all files

58
mm/memory_hotplug.c
View file

@ -29,6 +29,7 @@
#include <linux/suspend.h>
#include <linux/mm_inline.h>
#include <linux/firmware-map.h>
#include <linux/stop_machine.h>
#include <asm/tlbflush.h>
@ -1679,7 +1680,58 @@ static int is_memblock_offlined_cb(struct memory_block *mem, void *arg)
return ret;
}
int __ref remove_memory(u64 start, u64 size)
static int check_cpu_on_node(void *data)
{
struct pglist_data *pgdat = data;
int cpu;
for_each_present_cpu(cpu) {
if (cpu_to_node(cpu) == pgdat->node_id)
/*
* the cpu on this node isn't removed, and we can't
* offline this node.
*/
return -EBUSY;
}
return 0;
}
/* offline the node if all memory sections of this node are removed */
static void try_offline_node(int nid)
{
unsigned long start_pfn = NODE_DATA(nid)->node_start_pfn;
unsigned long end_pfn = start_pfn + NODE_DATA(nid)->node_spanned_pages;
unsigned long pfn;
for (pfn = start_pfn; pfn < end_pfn; pfn += PAGES_PER_SECTION) {
unsigned long section_nr = pfn_to_section_nr(pfn);
if (!present_section_nr(section_nr))
continue;
if (pfn_to_nid(pfn) != nid)
continue;
/*
* some memory sections of this node are not removed, and we
* can't offline node now.
*/
return;
}
if (stop_machine(check_cpu_on_node, NODE_DATA(nid), NULL))
return;
/*
* all memory/cpu of this node are removed, we can offline this
* node now.
*/
node_set_offline(nid);
unregister_one_node(nid);
}
int __ref remove_memory(int nid, u64 start, u64 size)
{
unsigned long start_pfn, end_pfn;
int ret = 0;
@ -1734,6 +1786,8 @@ repeat:
arch_remove_memory(start, size);
try_offline_node(nid);
unlock_memory_hotplug();
return 0;
@ -1743,7 +1797,7 @@ int offline_pages(unsigned long start_pfn, unsigned long nr_pages)
{
return -EINVAL;
}
int remove_memory(u64 start, u64 size)
int remove_memory(int nid, u64 start, u64 size)
{
return -EINVAL;
}