mm->pinned_vm counts pages of mm's address space that were permanently
pinned in memory by increasing their reference counter. The counter was
introduced by commit bc3e53f682d9 ("mm: distinguish between mlocked and
pinned pages"), while before it locked_vm had been used for such pages.
Obviously, we should reset the counter on fork if !CLONE_VM, just like
we do with locked_vm, but currently we don't. Let's fix it.
Signed-off-by: Vladimir Davydov <vdavydov@xxxxxxxxxxxxx>
---
kernel/fork.c | 1 +
1 file changed, 1 insertion(+)
diff --git a/kernel/fork.c b/kernel/fork.c
index 01f0d0c56cb9..938707e108db 100644
--- a/kernel/fork.c
+++ b/kernel/fork.c
@@ -534,6 +534,7 @@ static struct mm_struct *mm_init(struct mm_struct *mm, struct task_struct *p)
atomic_long_set(&mm->nr_ptes, 0);
mm->map_count = 0;
mm->locked_vm = 0;
+ mm->pinned_vm = 0;
memset(&mm->rss_stat, 0, sizeof(mm->rss_stat));
spin_lock_init(&mm->page_table_lock);
mm_init_cpumask(mm);
--
1.7.10.4
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