Messages in this thread Patch in this message | | | Subject | [PATCH 3/3] mm: catch memory commitment underflow | From | Konstantin Khlebnikov <> | Date | Wed, 25 Jun 2014 00:16:14 +0400 |
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This patch prints warning (if CONFIG_DEBUG_VM=y) when memory commitment becomes too negative.
Signed-off-by: Konstantin Khlebnikov <koct9i@gmail.com> --- mm/mmap.c | 6 ++++++ 1 file changed, 6 insertions(+)
diff --git a/mm/mmap.c b/mm/mmap.c index 129b847..d3decd9 100644 --- a/mm/mmap.c +++ b/mm/mmap.c @@ -134,6 +134,12 @@ int __vm_enough_memory(struct mm_struct *mm, long pages, int cap_sys_admin) { unsigned long free, allowed, reserve; +#ifdef CONFIG_DEBUG_VM + WARN_ONCE(percpu_counter_read(&vm_committed_as) < + -(s64)vm_committed_as_batch * num_online_cpus(), + "memory commitment underflow"); +#endif + vm_acct_memory(pages); /*
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