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Message-ID: <20130913110317.20994.25319.stgit@zurg> Date: Fri, 13 Sep 2013 15:03:17 +0400 From: Konstantin Khlebnikov <khlebnikov@...nvz.org> To: Hugh Dickins <hughd@...gle.com> Cc: linux-mm@...ck.org, linux-kernel@...r.kernel.org Subject: [PATCH] mm: catch memory commitment underflow This adds debug for vm_committed_as under CONFIG_DEBUG_VM=y Signed-off-by: Konstantin Khlebnikov <khlebnikov@...nvz.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 */ -- To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to majordomo@...r.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/
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