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-rw-r--r--mm/hugetlb.c82
1 files changed, 41 insertions, 41 deletions
diff --git a/mm/hugetlb.c b/mm/hugetlb.c
index 2c5c9ee4220d..a4dbba8965f3 100644
--- a/mm/hugetlb.c
+++ b/mm/hugetlb.c
@@ -716,6 +716,47 @@ unsigned long hugetlb_total_pages(void)
return nr_huge_pages * (HPAGE_SIZE / PAGE_SIZE);
}
+static int hugetlb_acct_memory(long delta)
+{
+ int ret = -ENOMEM;
+
+ spin_lock(&hugetlb_lock);
+ /*
+ * When cpuset is configured, it breaks the strict hugetlb page
+ * reservation as the accounting is done on a global variable. Such
+ * reservation is completely rubbish in the presence of cpuset because
+ * the reservation is not checked against page availability for the
+ * current cpuset. Application can still potentially OOM'ed by kernel
+ * with lack of free htlb page in cpuset that the task is in.
+ * Attempt to enforce strict accounting with cpuset is almost
+ * impossible (or too ugly) because cpuset is too fluid that
+ * task or memory node can be dynamically moved between cpusets.
+ *
+ * The change of semantics for shared hugetlb mapping with cpuset is
+ * undesirable. However, in order to preserve some of the semantics,
+ * we fall back to check against current free page availability as
+ * a best attempt and hopefully to minimize the impact of changing
+ * semantics that cpuset has.
+ */
+ if (delta > 0) {
+ if (gather_surplus_pages(delta) < 0)
+ goto out;
+
+ if (delta > cpuset_mems_nr(free_huge_pages_node)) {
+ return_unused_surplus_pages(delta);
+ goto out;
+ }
+ }
+
+ ret = 0;
+ if (delta < 0)
+ return_unused_surplus_pages((unsigned long) -delta);
+
+out:
+ spin_unlock(&hugetlb_lock);
+ return ret;
+}
+
/*
* We cannot handle pagefaults against hugetlb pages at all. They cause
* handle_mm_fault() to try to instantiate regular-sized pages in the
@@ -1248,47 +1289,6 @@ static long region_truncate(struct list_head *head, long end)
return chg;
}
-static int hugetlb_acct_memory(long delta)
-{
- int ret = -ENOMEM;
-
- spin_lock(&hugetlb_lock);
- /*
- * When cpuset is configured, it breaks the strict hugetlb page
- * reservation as the accounting is done on a global variable. Such
- * reservation is completely rubbish in the presence of cpuset because
- * the reservation is not checked against page availability for the
- * current cpuset. Application can still potentially OOM'ed by kernel
- * with lack of free htlb page in cpuset that the task is in.
- * Attempt to enforce strict accounting with cpuset is almost
- * impossible (or too ugly) because cpuset is too fluid that
- * task or memory node can be dynamically moved between cpusets.
- *
- * The change of semantics for shared hugetlb mapping with cpuset is
- * undesirable. However, in order to preserve some of the semantics,
- * we fall back to check against current free page availability as
- * a best attempt and hopefully to minimize the impact of changing
- * semantics that cpuset has.
- */
- if (delta > 0) {
- if (gather_surplus_pages(delta) < 0)
- goto out;
-
- if (delta > cpuset_mems_nr(free_huge_pages_node)) {
- return_unused_surplus_pages(delta);
- goto out;
- }
- }
-
- ret = 0;
- if (delta < 0)
- return_unused_surplus_pages((unsigned long) -delta);
-
-out:
- spin_unlock(&hugetlb_lock);
- return ret;
-}
-
int hugetlb_reserve_pages(struct inode *inode, long from, long to)
{
long ret, chg;