From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1755592Ab3IMLDX (ORCPT ); Fri, 13 Sep 2013 07:03:23 -0400 Received: from mail-la0-f44.google.com ([209.85.215.44]:58603 "EHLO mail-la0-f44.google.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1751964Ab3IMLDV (ORCPT ); Fri, 13 Sep 2013 07:03:21 -0400 Subject: [PATCH] mm: catch memory commitment underflow To: Hugh Dickins From: Konstantin Khlebnikov Cc: linux-mm@kvack.org, linux-kernel@vger.kernel.org Date: Fri, 13 Sep 2013 15:03:17 +0400 Message-ID: <20130913110317.20994.25319.stgit@zurg> User-Agent: StGit/0.15 MIME-Version: 1.0 Content-Type: text/plain; charset="utf-8" Content-Transfer-Encoding: 7bit Sender: linux-kernel-owner@vger.kernel.org List-ID: X-Mailing-List: linux-kernel@vger.kernel.org This adds debug for vm_committed_as under CONFIG_DEBUG_VM=y Signed-off-by: Konstantin Khlebnikov --- 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 */