Messages in this thread Patch in this message | | | Subject | [PATCH] mm: catch memory commitment underflow | From | Konstantin Khlebnikov <> | Date | Fri, 13 Sep 2013 15:03:17 +0400 |
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This adds debug for vm_committed_as under CONFIG_DEBUG_VM=y
Signed-off-by: Konstantin Khlebnikov <khlebnikov@openvz.org> --- 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 */
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