@@ -858,6 +858,11 @@ static inline spinlock_t *huge_pte_lockptr(struct hstate *h,
void hugetlb_report_usage(struct seq_file *m, struct mm_struct *mm);
+static inline void hugetlb_count_init(struct mm_struct *mm)
+{
+ atomic_long_set(&mm->hugetlb_usage, 0);
+}
+
static inline void hugetlb_count_add(long l, struct mm_struct *mm)
{
atomic_long_add(l, &mm->hugetlb_usage);
@@ -1050,6 +1050,9 @@ static struct mm_struct *mm_init(struct mm_struct *mm, struct task_struct *p,
mm->pmd_huge_pte = NULL;
#endif
mm_init_uprobes_state(mm);
+#ifdef CONFIG_HUGETLB_PAGE
+ hugetlb_count_init(mm);
+#endif
if (current->mm) {
mm->flags = current->mm->flags & MMF_INIT_MASK;
After fork, the new process will get incorrect hugetlb_usage. The reason is dup_mm copies old_mm to the new one and mm_init does not init hugetlb_usage. Fix this by adding hugetlb_count_init in mm_init. Signed-off-by: Liu Zixian <liuzixian4@huawei.com> --- include/linux/hugetlb.h | 5 +++++ kernel/fork.c | 3 +++ 2 files changed, 8 insertions(+)