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Message-ID: <5031DB52.9030806@gmail.com>
Date: Mon, 20 Aug 2012 14:38:10 +0800
From: wujianguo <wujianguo106@...il.com>
To: tony.luck@...el.com, fenghua.yu@...el.com, dhowells@...hat.com,
tj@...nel.org, mgorman@...e.de, yinghai@...nel.org,
minchan.kim@...il.com
CC: akpm@...ux-foundation.org, viro@...iv.linux.org.uk,
aarcange@...hat.com, davem@...emloft.net, hannes@...xchg.org,
liuj97@...il.com, wency@...fujitsu.com, rientjes@...gle.com,
kamezawa.hiroyu@...fujitsu.com, mhocko@...e.cz,
linux-ia64@...r.kernel.org, linux-kernel@...r.kernel.org,
linux-mm@...ck.org, ptesarik@...e.cz, jiang.liu@...wei.com,
guohanjun@...wei.com, qiuxishi@...wei.com
Subject: [PATCH]mm: fix-up zone present pages
From: Jianguo Wu <wujianguo@...wei.com>
Hi all,
I think zone->present_pages indicates pages that buddy system can management,
it should be:
zone->present_pages = spanned pages - absent pages - bootmem pages,
but now:
zone->present_pages = spanned pages - absent pages - memmap pages.
spanned pages：total size, including holes.
absent pages: holes.
bootmem pages: pages used in system boot, managed by bootmem allocator.
memmap pages: pages used by page structs.
This may cause zone->present_pages less than it should be.
For example, numa node 1 has ZONE_NORMAL and ZONE_MOVABLE,
it's memmap and other bootmem will be allocated from ZONE_MOVABLE,
so ZONE_NORMAL's present_pages should be spanned pages - absent pages,
but now it also minus memmap pages(free_area_init_core), which are actually allocated
from ZONE_MOVABLE. When offline all memory of a zone, This will cause zone->present_pages
less than 0, because present_pages is unsigned long type, it is actually
a very large integer, it indirectly caused zone->watermark[WMARK_MIN]
become a large integer(setup_per_zone_wmarks()), than cause totalreserve_pages
become a large integer(calculate_totalreserve_pages()), and finally cause memory
allocating failure when fork process(__vm_enough_memory()).
[root@...alhost ~]# dmesg
-bash: fork: Cannot allocate memory
I think bug described in http://marc.info/?l=linux-mm&m=134502182714186&w=2 is also
caused by wrong zone present pages.
This patch intends to fix-up zone->present_pages when memory are freed to
buddy system in x86_64 and IA64 platform.
Thanks.
Signed-off-by: Jianguo Wu <wujianguo@...wei.com>
Signed-off-by: Jiang Liu <jiang.liu@...wei.com>
---
arch/ia64/mm/init.c | 1 +
include/linux/mm.h | 4 ++++
mm/bootmem.c | 9 ++++++++-
mm/memory_hotplug.c | 7 +++++++
mm/nobootmem.c | 3 +++
mm/page_alloc.c | 34 ++++++++++++++++++++++++++++++++++
6 files changed, 57 insertions(+), 1 deletions(-)
diff --git a/arch/ia64/mm/init.c b/arch/ia64/mm/init.c
index b960ba0..c78e3fd 100644
--- a/arch/ia64/mm/init.c
+++ b/arch/ia64/mm/init.c
@@ -640,6 +640,7 @@ mem_init (void)
free_floating_node_bootmem();
#endif
+ reset_zone_present_pages();
for_each_online_pgdat(pgdat)
if (pgdat->bdata->node_bootmem_map)
totalram_pages += free_all_bootmem_node(pgdat);
diff --git a/include/linux/mm.h b/include/linux/mm.h
index 311be90..a1bd8ea 100644
--- a/include/linux/mm.h
+++ b/include/linux/mm.h
@@ -1662,5 +1662,9 @@ static inline unsigned int debug_guardpage_minorder(void) { return 0; }
static inline bool page_is_guard(struct page *page) { return false; }
#endif /* CONFIG_DEBUG_PAGEALLOC */
+extern void reset_zone_present_pages(void);
+extern void fixup_zone_present_pages(int nid, unsigned long start_pfn,
+ unsigned long end_pfn);
+
#endif /* __KERNEL__ */
#endif /* _LINUX_MM_H */
diff --git a/mm/bootmem.c b/mm/bootmem.c
index bcb63ac..e00b491 100644
--- a/mm/bootmem.c
+++ b/mm/bootmem.c
@@ -198,6 +198,8 @@ static unsigned long __init free_all_bootmem_core(bootmem_data_t *bdata)
int order = ilog2(BITS_PER_LONG);
__free_pages_bootmem(pfn_to_page(start), order);
+ fixup_zone_present_pages(page_to_nid(pfn_to_page(start)),
+ start, start + BITS_PER_LONG);
count += BITS_PER_LONG;
start += BITS_PER_LONG;
} else {
@@ -208,6 +210,8 @@ static unsigned long __init free_all_bootmem_core(bootmem_data_t *bdata)
if (vec & 1) {
page = pfn_to_page(start + off);
__free_pages_bootmem(page, 0);
+ fixup_zone_present_pages(page_to_nid(page),
+ start + off, start + off + 1);
count++;
}
vec >>= 1;
@@ -221,8 +225,11 @@ static unsigned long __init free_all_bootmem_core(bootmem_data_t *bdata)
pages = bdata->node_low_pfn - bdata->node_min_pfn;
pages = bootmem_bootmap_pages(pages);
count += pages;
- while (pages--)
+ while (pages--) {
+ fixup_zone_present_pages(page_to_nid(page),
+ page_to_pfn(page), page_to_pfn(page) + 1);
__free_pages_bootmem(page++, 0);
+ }
bdebug("nid=%td released=%lx\n", bdata - bootmem_node_data, count);
diff --git a/mm/memory_hotplug.c b/mm/memory_hotplug.c
index 3ad25f9..bc7e7a2 100644
--- a/mm/memory_hotplug.c
+++ b/mm/memory_hotplug.c
@@ -106,6 +106,7 @@ static void get_page_bootmem(unsigned long info, struct page *page,
void __ref put_page_bootmem(struct page *page)
{
unsigned long type;
+ struct zone *zone;
type = (unsigned long) page->lru.next;
BUG_ON(type < MEMORY_HOTPLUG_MIN_BOOTMEM_TYPE ||
@@ -116,6 +117,12 @@ void __ref put_page_bootmem(struct page *page)
set_page_private(page, 0);
INIT_LIST_HEAD(&page->lru);
__free_pages_bootmem(page, 0);
+
+ zone = page_zone(page);
+ zone_span_writelock(zone);
+ zone->present_pages++;
+ zone_span_writeunlock(zone);
+ totalram_pages++;
}
}
diff --git a/mm/nobootmem.c b/mm/nobootmem.c
index 4055730..8027861 100644
--- a/mm/nobootmem.c
+++ b/mm/nobootmem.c
@@ -116,6 +116,8 @@ static unsigned long __init __free_memory_core(phys_addr_t start,
return 0;
__free_pages_memory(start_pfn, end_pfn);
+ fixup_zone_present_pages(pfn_to_nid(start >> PAGE_SHIFT),
+ start_pfn, end_pfn);
return end_pfn - start_pfn;
}
@@ -126,6 +128,7 @@ unsigned long __init free_low_memory_core_early(int nodeid)
phys_addr_t start, end, size;
u64 i;
+ reset_zone_present_pages();
for_each_free_mem_range(i, MAX_NUMNODES, &start, &end, NULL)
count += __free_memory_core(start, end);
diff --git a/mm/page_alloc.c b/mm/page_alloc.c
index fcb0932..36c35bb 100644
--- a/mm/page_alloc.c
+++ b/mm/page_alloc.c
@@ -6074,3 +6074,37 @@ void dump_page(struct page *page)
dump_page_flags(page->flags);
mem_cgroup_print_bad_page(page);
}
+
+/* reset zone->present_pages */
+void reset_zone_present_pages(void)
+{
+ struct zone *z;
+ int i, nid;
+
+ for_each_node_state(nid, N_HIGH_MEMORY) {
+ for (i = 0; i < MAX_NR_ZONES; i++) {
+ z = NODE_DATA(nid)->node_zones + i;
+ z->present_pages = 0;
+ }
+ }
+}
+
+/* calculate zone's present pages in buddy system */
+void fixup_zone_present_pages(int nid, unsigned long start_pfn,
+ unsigned long end_pfn)
+{
+ struct zone *z;
+ unsigned long zone_start_pfn, zone_end_pfn;
+ int i;
+
+ for (i = 0; i < MAX_NR_ZONES; i++) {
+ z = NODE_DATA(nid)->node_zones + i;
+ zone_start_pfn = z->zone_start_pfn;
+ zone_end_pfn = zone_start_pfn + z->spanned_pages;
+
+ /* if the two regions intersect */
+ if (!(zone_start_pfn >= end_pfn || zone_end_pfn <= start_pfn))
+ z->present_pages += min(end_pfn, zone_end_pfn) -
+ max(start_pfn, zone_start_pfn);
+ }
+}
--
1.7.6.1
.
--
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