summaryrefslogtreecommitdiffstats
path: root/mm/page_cgroup.c
diff options
context:
space:
mode:
Diffstat (limited to 'mm/page_cgroup.c')
-rw-r--r--mm/page_cgroup.c63
1 files changed, 41 insertions, 22 deletions
diff --git a/mm/page_cgroup.c b/mm/page_cgroup.c
index f59d797dc5a..ab27ff75051 100644
--- a/mm/page_cgroup.c
+++ b/mm/page_cgroup.c
@@ -21,7 +21,7 @@ static unsigned long total_usage;
#if !defined(CONFIG_SPARSEMEM)
-void __init pgdat_page_cgroup_init(struct pglist_data *pgdat)
+void __meminit pgdat_page_cgroup_init(struct pglist_data *pgdat)
{
pgdat->node_page_cgroup = NULL;
}
@@ -49,6 +49,9 @@ static int __init alloc_node_page_cgroup(int nid)
start_pfn = NODE_DATA(nid)->node_start_pfn;
nr_pages = NODE_DATA(nid)->node_spanned_pages;
+ if (!nr_pages)
+ return 0;
+
table_size = sizeof(struct page_cgroup) * nr_pages;
base = __alloc_bootmem_node_nopanic(NODE_DATA(nid),
@@ -97,7 +100,8 @@ struct page_cgroup *lookup_page_cgroup(struct page *page)
return section->page_cgroup + pfn;
}
-int __meminit init_section_page_cgroup(unsigned long pfn)
+/* __alloc_bootmem...() is protected by !slab_available() */
+int __init_refok init_section_page_cgroup(unsigned long pfn)
{
struct mem_section *section;
struct page_cgroup *base, *pc;
@@ -106,19 +110,29 @@ int __meminit init_section_page_cgroup(unsigned long pfn)
section = __pfn_to_section(pfn);
- if (section->page_cgroup)
- return 0;
-
- nid = page_to_nid(pfn_to_page(pfn));
-
- table_size = sizeof(struct page_cgroup) * PAGES_PER_SECTION;
- if (slab_is_available()) {
- base = kmalloc_node(table_size, GFP_KERNEL, nid);
- if (!base)
- base = vmalloc_node(table_size, nid);
- } else {
- base = __alloc_bootmem_node_nopanic(NODE_DATA(nid), table_size,
+ if (!section->page_cgroup) {
+ nid = page_to_nid(pfn_to_page(pfn));
+ table_size = sizeof(struct page_cgroup) * PAGES_PER_SECTION;
+ if (slab_is_available()) {
+ base = kmalloc_node(table_size, GFP_KERNEL, nid);
+ if (!base)
+ base = vmalloc_node(table_size, nid);
+ } else {
+ base = __alloc_bootmem_node_nopanic(NODE_DATA(nid),
+ table_size,
PAGE_SIZE, __pa(MAX_DMA_ADDRESS));
+ }
+ } else {
+ /*
+ * We don't have to allocate page_cgroup again, but
+ * address of memmap may be changed. So, we have to initialize
+ * again.
+ */
+ base = section->page_cgroup + pfn;
+ table_size = 0;
+ /* check address of memmap is changed or not. */
+ if (base->page == pfn_to_page(pfn))
+ return 0;
}
if (!base) {
@@ -158,14 +172,14 @@ void __free_page_cgroup(unsigned long pfn)
}
}
-int online_page_cgroup(unsigned long start_pfn,
+int __meminit online_page_cgroup(unsigned long start_pfn,
unsigned long nr_pages,
int nid)
{
unsigned long start, end, pfn;
int fail = 0;
- start = start_pfn & (PAGES_PER_SECTION - 1);
+ start = start_pfn & ~(PAGES_PER_SECTION - 1);
end = ALIGN(start_pfn + nr_pages, PAGES_PER_SECTION);
for (pfn = start; !fail && pfn < end; pfn += PAGES_PER_SECTION) {
@@ -183,12 +197,12 @@ int online_page_cgroup(unsigned long start_pfn,
return -ENOMEM;
}
-int offline_page_cgroup(unsigned long start_pfn,
+int __meminit offline_page_cgroup(unsigned long start_pfn,
unsigned long nr_pages, int nid)
{
unsigned long start, end, pfn;
- start = start_pfn & (PAGES_PER_SECTION - 1);
+ start = start_pfn & ~(PAGES_PER_SECTION - 1);
end = ALIGN(start_pfn + nr_pages, PAGES_PER_SECTION);
for (pfn = start; pfn < end; pfn += PAGES_PER_SECTION)
@@ -197,7 +211,7 @@ int offline_page_cgroup(unsigned long start_pfn,
}
-static int page_cgroup_callback(struct notifier_block *self,
+static int __meminit page_cgroup_callback(struct notifier_block *self,
unsigned long action, void *arg)
{
struct memory_notify *mn = arg;
@@ -207,18 +221,23 @@ static int page_cgroup_callback(struct notifier_block *self,
ret = online_page_cgroup(mn->start_pfn,
mn->nr_pages, mn->status_change_nid);
break;
- case MEM_CANCEL_ONLINE:
case MEM_OFFLINE:
offline_page_cgroup(mn->start_pfn,
mn->nr_pages, mn->status_change_nid);
break;
+ case MEM_CANCEL_ONLINE:
case MEM_GOING_OFFLINE:
break;
case MEM_ONLINE:
case MEM_CANCEL_OFFLINE:
break;
}
- ret = notifier_from_errno(ret);
+
+ if (ret)
+ ret = notifier_from_errno(ret);
+ else
+ ret = NOTIFY_OK;
+
return ret;
}
@@ -248,7 +267,7 @@ void __init page_cgroup_init(void)
" want\n");
}
-void __init pgdat_page_cgroup_init(struct pglist_data *pgdat)
+void __meminit pgdat_page_cgroup_init(struct pglist_data *pgdat)
{
return;
}