This adds debug for vm_committed_as under CONFIG_DEBUG_VM=y
Signed-off-by: Konstantin Khlebnikov <[email protected]>
---
mm/mmap.c | 6 ++++++
1 file changed, 6 insertions(+)
diff --git a/mm/mmap.c b/mm/mmap.c
index 9d54851..2c7e6aa 100644
--- a/mm/mmap.c
+++ b/mm/mmap.c
@@ -131,6 +131,12 @@ int __vm_enough_memory(struct mm_struct *mm, long pages, int cap_sys_admin)
vm_acct_memory(pages);
+#ifdef CONFIG_DEBUG_VM
+ WARN_ONCE(percpu_counter_read(&vm_committed_as) <
+ -(s64)vm_committed_as_batch * num_online_cpus(),
+ "memory commitment underflow");
+#endif
+
/*
* Sometimes we want to use more memory than we have
*/