Prev: [PATCH 3/9] hugetlb: rename hugepage allocation functions
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From: Naoya Horiguchi on 10 Aug 2010 05:40
This patch adds "HugePages_Crpt:" line in /proc/meminfo like below:

# cat /proc/meminfo |grep -e Huge -e Corrupt
HardwareCorrupted: 6144 kB
HugePages_Total: 8
HugePages_Free: 5
HugePages_Rsvd: 0
HugePages_Surp: 0
HugePages_Crpt: 3
Hugepagesize: 2048 kB

Signed-off-by: Naoya Horiguchi <n-horiguchi(a)ah.jp.nec.com>
---
include/linux/hugetlb.h | 5 +++++
mm/hugetlb.c | 19 +++++++++++++++++++
mm/memory-failure.c | 2 ++
3 files changed, 26 insertions(+), 0 deletions(-)

diff --git linux-mce-hwpoison/include/linux/hugetlb.h linux-mce-hwpoison/include/linux/hugetlb.h
index 2b7de04..c7b4dae 100644
--- linux-mce-hwpoison/include/linux/hugetlb.h
+++ linux-mce-hwpoison/include/linux/hugetlb.h
@@ -45,6 +45,8 @@ int hugetlb_reserve_pages(struct inode *inode, long from, long to,
void hugetlb_unreserve_pages(struct inode *inode, long offset, long freed);
void __isolate_hwpoisoned_huge_page(struct page *page);
void isolate_hwpoisoned_huge_page(struct page *page);
+void increment_corrupted_huge_page(struct page *page);
+void decrement_corrupted_huge_page(struct page *page);
void copy_huge_page(struct page *dst, struct page *src);

extern unsigned long hugepages_treat_as_movable;
@@ -105,6 +107,8 @@ static inline void hugetlb_report_meminfo(struct seq_file *m)
#define huge_pte_offset(mm, address) 0
#define __isolate_hwpoisoned_huge_page(page) 0
#define isolate_hwpoisoned_huge_page(page) 0
+#define increment_corrupted_huge_page(page) 0
+#define decrement_corrupted_huge_page(page) 0
#define copy_huge_page(dst, src) NULL

#define hugetlb_change_protection(vma, address, end, newprot)
@@ -220,6 +224,7 @@ struct hstate {
unsigned long resv_huge_pages;
unsigned long surplus_huge_pages;
unsigned long nr_overcommit_huge_pages;
+ unsigned long corrupted_huge_pages;
struct list_head hugepage_freelists[MAX_NUMNODES];
unsigned int nr_huge_pages_node[MAX_NUMNODES];
unsigned int free_huge_pages_node[MAX_NUMNODES];
diff --git linux-mce-hwpoison/mm/hugetlb.c linux-mce-hwpoison/mm/hugetlb.c
index 2a61a8f..122790b 100644
--- linux-mce-hwpoison/mm/hugetlb.c
+++ linux-mce-hwpoison/mm/hugetlb.c
@@ -2040,11 +2040,13 @@ void hugetlb_report_meminfo(struct seq_file *m)
"HugePages_Free: %5lu\n"
"HugePages_Rsvd: %5lu\n"
"HugePages_Surp: %5lu\n"
+ "HugePages_Crpt: %5lu\n"
"Hugepagesize: %8lu kB\n",
h->nr_huge_pages,
h->free_huge_pages,
h->resv_huge_pages,
h->surplus_huge_pages,
+ h->corrupted_huge_pages,
1UL << (huge_page_order(h) + PAGE_SHIFT - 10));
}

@@ -2980,6 +2982,23 @@ void hugetlb_unreserve_pages(struct inode *inode, long offset, long freed)
hugetlb_acct_memory(h, -(chg - freed));
}

+void increment_corrupted_huge_page(struct page *hpage)
+{
+ struct hstate *h = page_hstate(hpage);
+ spin_lock(&hugetlb_lock);
+ h->corrupted_huge_pages++;
+ spin_unlock(&hugetlb_lock);
+}
+
+void decrement_corrupted_huge_page(struct page *hpage)
+{
+ struct hstate *h = page_hstate(hpage);
+ spin_lock(&hugetlb_lock);
+ BUG_ON(!h->corrupted_huge_pages);
+ h->corrupted_huge_pages--;
+ spin_unlock(&hugetlb_lock);
+}
+
/*
* This function is called from memory failure code.
* Assume the caller holds page lock of the head page.
diff --git linux-mce-hwpoison/mm/memory-failure.c linux-mce-hwpoison/mm/memory-failure.c
index 1f54901..1e9794d 100644
--- linux-mce-hwpoison/mm/memory-failure.c
+++ linux-mce-hwpoison/mm/memory-failure.c
@@ -938,6 +938,7 @@ static void set_page_hwpoison_huge_page(struct page *hpage)
int nr_pages = 1 << compound_order(hpage);
for (i = 0; i < nr_pages; i++)
SetPageHWPoison(hpage + i);
+ increment_corrupted_huge_page(hpage);
}

static void clear_page_hwpoison_huge_page(struct page *hpage)
@@ -946,6 +947,7 @@ static void clear_page_hwpoison_huge_page(struct page *hpage)
int nr_pages = 1 << compound_order(hpage);
for (i = 0; i < nr_pages; i++)
ClearPageHWPoison(hpage + i);
+ decrement_corrupted_huge_page(hpage);
}

int __memory_failure(unsigned long pfn, int trapno, int flags)
--
1.7.2.1

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Prev: [PATCH 3/9] hugetlb: rename hugepage allocation functions
Next: [PATCH 0/9] Hugepage migration (v2)