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Message-Id: <20090612143429.76ef2357.kamezawa.hiroyu@jp.fujitsu.com>
Date: Fri, 12 Jun 2009 14:34:29 +0900
From: KAMEZAWA Hiroyuki <kamezawa.hiroyu@...fujitsu.com>
To: Li Zefan <lizf@...fujitsu.com>
Cc: Pekka J Enberg <penberg@...helsinki.fi>,
linux-kernel@...r.kernel.org, mingo@...e.hu, hannes@...xchg.org,
torvalds@...ux-foundation.org, yinghai@...nel.org,
Balbir Singh <balbir@...ux.vnet.ibm.com>,
"linux-mm@...ck.org" <linux-mm@...ck.org>
Subject: [BUGFIX][PATCH] memcg: fix page_cgroup fatal error in FLATMEM (Was
Re: boot panic with memcg enabled
On Fri, 12 Jun 2009 12:01:42 +0800
Li Zefan <lizf@...fujitsu.com> wrote:
> alloc_bootmem() is not gone, but slab allocator is setup much earlier now.
> See this commit:
>
> commit 83b519e8b9572c319c8e0c615ee5dd7272856090
> Author: Pekka Enberg <penberg@...helsinki.fi>
> Date: Wed Jun 10 19:40:04 2009 +0300
>
> slab: setup allocators earlier in the boot sequence
>
> now page_cgroup_init() is called after mem_init().
Ok, Li-san, could you test this on !SPARSEMEM config ?
x86-64 doesn't allow memory models other than SPARSEMEM.
This works well on SPARSEMEM.
I think FLATMEM should go away in future....but maybe never ;(
Thanks,
-Kame
==
From: KAMEZAWA Hiroyuki <kamezawa.hiroyu@...fujitsu.com>
Now, SLAB is configured in very early stage and it can be used in
init routine now.
But replacing alloc_bootmem() in FLAT/DISCONTIGMEM's page_cgroup()
initialization breaks the allocation, now.
(Works well in SPARSEMEM case...it supports MEMORY_HOTPLUG and
Size of page_cgroup is in reasonable size (< 1 << MAX_ORDER.)
This patch revive FLATMEM+memory cgroup by using alloc_bootmem.
In future,
We stop to support FLATMEM (if no users) or rewrite codes for flatmem
completely. But this will adds more messy codes and (big) overheads.
Reported-by: Li Zefan <lizf@...fujitsu.com>
Signed-off-by: KAMEZAWA Hiroyuki <kamezawa.hiroyu@...fujitsu.com>
---
Index: linux-2.6.30.org/init/main.c
===================================================================
--- linux-2.6.30.org.orig/init/main.c
+++ linux-2.6.30.org/init/main.c
@@ -539,6 +539,11 @@ void __init __weak thread_info_cache_ini
*/
static void __init mm_init(void)
{
+ /*
+ * page_cgroup requires countinous pages as memmap
+ * and it's bigger than MAX_ORDER unless SPARSEMEM.
+ */
+ page_cgroup_init_flatmem();
mem_init();
kmem_cache_init();
vmalloc_init();
Index: linux-2.6.30.org/mm/page_cgroup.c
===================================================================
--- linux-2.6.30.org.orig/mm/page_cgroup.c
+++ linux-2.6.30.org/mm/page_cgroup.c
@@ -47,8 +47,6 @@ static int __init alloc_node_page_cgroup
struct page_cgroup *base, *pc;
unsigned long table_size;
unsigned long start_pfn, nr_pages, index;
- struct page *page;
- unsigned int order;
start_pfn = NODE_DATA(nid)->node_start_pfn;
nr_pages = NODE_DATA(nid)->node_spanned_pages;
@@ -57,13 +55,11 @@ static int __init alloc_node_page_cgroup
return 0;
table_size = sizeof(struct page_cgroup) * nr_pages;
- order = get_order(table_size);
- page = alloc_pages_node(nid, GFP_NOWAIT | __GFP_ZERO, order);
- if (!page)
- page = alloc_pages_node(-1, GFP_NOWAIT | __GFP_ZERO, order);
- if (!page)
+
+ base = __alloc_bootmem_node_nopanic(NODE_DATA(nid),
+ table_size, PAG_SIZE, __pa(MAX_DMA_ADDRESS));
+ if (!base)
return -ENOMEM;
- base = page_address(page);
for (index = 0; index < nr_pages; index++) {
pc = base + index;
__init_page_cgroup(pc, start_pfn + index);
@@ -73,7 +69,7 @@ static int __init alloc_node_page_cgroup
return 0;
}
-void __init page_cgroup_init(void)
+void __init page_cgroup_init_flatmem(void)
{
int nid, fail;
@@ -117,16 +113,11 @@ static int __init_refok init_section_pag
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 | __GFP_NOWARN, 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));
- }
+ VM_BUG_ON(!slab_is_available());
+ base = kmalloc_node(table_size,
+ GFP_KERNEL | __GFP_NOWARN, nid);
+ if (!base)
+ base = vmalloc_node(table_size, nid);
} else {
/*
* We don't have to allocate page_cgroup again, but
Index: linux-2.6.30.org/include/linux/page_cgroup.h
===================================================================
--- linux-2.6.30.org.orig/include/linux/page_cgroup.h
+++ linux-2.6.30.org/include/linux/page_cgroup.h
@@ -18,7 +18,19 @@ struct page_cgroup {
};
void __meminit pgdat_page_cgroup_init(struct pglist_data *pgdat);
-void __init page_cgroup_init(void);
+
+#ifdef CONFIG_SPARSEMEM
+static inline void __init page_cgroup_init_flatmem(void)
+{
+}
+extern void __init page_cgroup_init(void);
+#else
+void __init page_cgroup_init_flatmem(void)
+static inline void __init page_cgroup_init(void)
+{
+}
+#endif
+
struct page_cgroup *lookup_page_cgroup(struct page *page);
enum {
@@ -87,6 +99,10 @@ static inline void page_cgroup_init(void
{
}
+static inline void __init page_cgroup_init_flatmem(void)
+{
+}
+
#endif
#ifdef CONFIG_CGROUP_MEM_RES_CTLR_SWAP
--
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