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authorWen Congyang <wency@cn.fujitsu.com>2012-10-08 16:34:01 -0700
committerLinus Torvalds <torvalds@linux-foundation.org>2012-10-09 16:23:02 +0900
commite90bdb7f52f94204c78fb40b0804645defdebd71 (patch)
tree4acb09ecd1f98fd98408f18e816d075601585d2a
parenta16cee10c7ab994546ed98d9abfd4de74050124a (diff)
downloadop-kernel-dev-e90bdb7f52f94204c78fb40b0804645defdebd71.zip
op-kernel-dev-e90bdb7f52f94204c78fb40b0804645defdebd71.tar.gz
memory-hotplug: update memory block's state and notify userspace
remove_memory() will be called when hot removing a memory device. But even if offlining memory, we cannot notice it. So the patch updates the memory block's state and sends notification to userspace. Additionally, the memory device may contain more than one memory block. If the memory block has been offlined, __offline_pages() will fail. So we should try to offline one memory block at a time. Thus remove_memory() also check each memory block's state. So there is no need to check the memory block's state before calling remove_memory(). Signed-off-by: Wen Congyang <wency@cn.fujitsu.com> Signed-off-by: Yasuaki Ishimatsu <isimatu.yasuaki@jp.fujitsu.com> Cc: David Rientjes <rientjes@google.com> Cc: Jiang Liu <liuj97@gmail.com> Cc: Len Brown <len.brown@intel.com> Cc: Christoph Lameter <cl@linux.com> Cc: Minchan Kim <minchan.kim@gmail.com> Cc: KOSAKI Motohiro <kosaki.motohiro@jp.fujitsu.com> Signed-off-by: Andrew Morton <akpm@linux-foundation.org> Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
-rw-r--r--drivers/base/memory.c31
-rw-r--r--include/linux/memory_hotplug.h2
-rw-r--r--mm/memory_hotplug.c33
3 files changed, 61 insertions, 5 deletions
diff --git a/drivers/base/memory.c b/drivers/base/memory.c
index 44e7de6..86c8821 100644
--- a/drivers/base/memory.c
+++ b/drivers/base/memory.c
@@ -275,13 +275,11 @@ memory_block_action(unsigned long phys_index, unsigned long action)
return ret;
}
-static int memory_block_change_state(struct memory_block *mem,
+static int __memory_block_change_state(struct memory_block *mem,
unsigned long to_state, unsigned long from_state_req)
{
int ret = 0;
- mutex_lock(&mem->state_mutex);
-
if (mem->state != from_state_req) {
ret = -EINVAL;
goto out;
@@ -309,10 +307,20 @@ static int memory_block_change_state(struct memory_block *mem,
break;
}
out:
- mutex_unlock(&mem->state_mutex);
return ret;
}
+static int memory_block_change_state(struct memory_block *mem,
+ unsigned long to_state, unsigned long from_state_req)
+{
+ int ret;
+
+ mutex_lock(&mem->state_mutex);
+ ret = __memory_block_change_state(mem, to_state, from_state_req);
+ mutex_unlock(&mem->state_mutex);
+
+ return ret;
+}
static ssize_t
store_mem_state(struct device *dev,
struct device_attribute *attr, const char *buf, size_t count)
@@ -653,6 +661,21 @@ int unregister_memory_section(struct mem_section *section)
}
/*
+ * offline one memory block. If the memory block has been offlined, do nothing.
+ */
+int offline_memory_block(struct memory_block *mem)
+{
+ int ret = 0;
+
+ mutex_lock(&mem->state_mutex);
+ if (mem->state != MEM_OFFLINE)
+ ret = __memory_block_change_state(mem, MEM_OFFLINE, MEM_ONLINE);
+ mutex_unlock(&mem->state_mutex);
+
+ return ret;
+}
+
+/*
* Initialize the sysfs support for memory devices...
*/
int __init memory_dev_init(void)
diff --git a/include/linux/memory_hotplug.h b/include/linux/memory_hotplug.h
index e64fe80..95573ec 100644
--- a/include/linux/memory_hotplug.h
+++ b/include/linux/memory_hotplug.h
@@ -10,6 +10,7 @@ struct page;
struct zone;
struct pglist_data;
struct mem_section;
+struct memory_block;
#ifdef CONFIG_MEMORY_HOTPLUG
@@ -234,6 +235,7 @@ extern int mem_online_node(int nid);
extern int add_memory(int nid, u64 start, u64 size);
extern int arch_add_memory(int nid, u64 start, u64 size);
extern int offline_pages(unsigned long start_pfn, unsigned long nr_pages);
+extern int offline_memory_block(struct memory_block *mem);
extern int remove_memory(u64 start, u64 size);
extern int sparse_add_one_section(struct zone *zone, unsigned long start_pfn,
int nr_pages);
diff --git a/mm/memory_hotplug.c b/mm/memory_hotplug.c
index dfc0a61..7d07974 100644
--- a/mm/memory_hotplug.c
+++ b/mm/memory_hotplug.c
@@ -1014,11 +1014,42 @@ int offline_pages(unsigned long start_pfn, unsigned long nr_pages)
int remove_memory(u64 start, u64 size)
{
+ struct memory_block *mem = NULL;
+ struct mem_section *section;
unsigned long start_pfn, end_pfn;
+ unsigned long pfn, section_nr;
+ int ret;
start_pfn = PFN_DOWN(start);
end_pfn = start_pfn + PFN_DOWN(size);
- return __offline_pages(start_pfn, end_pfn, 120 * HZ);
+
+ for (pfn = start_pfn; pfn < end_pfn; pfn += PAGES_PER_SECTION) {
+ section_nr = pfn_to_section_nr(pfn);
+ if (!present_section_nr(section_nr))
+ continue;
+
+ section = __nr_to_section(section_nr);
+ /* same memblock? */
+ if (mem)
+ if ((section_nr >= mem->start_section_nr) &&
+ (section_nr <= mem->end_section_nr))
+ continue;
+
+ mem = find_memory_block_hinted(section, mem);
+ if (!mem)
+ continue;
+
+ ret = offline_memory_block(mem);
+ if (ret) {
+ kobject_put(&mem->dev.kobj);
+ return ret;
+ }
+ }
+
+ if (mem)
+ kobject_put(&mem->dev.kobj);
+
+ return 0;
}
#else
int offline_pages(unsigned long start_pfn, unsigned long nr_pages)
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