From: Konstantin Khlebnikov <koct9i@gmail.com>
To: linux-mm@kvack.org, Andrew Morton <akpm@linux-foundation.org>
Cc: Hugh Dickins <hughd@google.com>, linux-kernel@vger.kernel.org
Subject: [PATCH 3/3] mm: catch memory commitment underflow
Date: Wed, 25 Jun 2014 00:16:14 +0400 [thread overview]
Message-ID: <20140624201614.18273.39034.stgit@zurg> (raw)
In-Reply-To: <20140624201606.18273.44270.stgit@zurg>
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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next prev parent reply other threads:[~2014-06-24 20:16 UTC|newest]
Thread overview: 13+ messages / expand[flat|nested] mbox.gz Atom feed top
2014-06-24 20:16 [PATCH 1/3] shmem: fix double uncharge in __shmem_file_setup() Konstantin Khlebnikov
2014-06-24 20:16 ` [PATCH 2/3] shmem: update memory reservation on truncate Konstantin Khlebnikov
2014-06-26 3:53 ` Hugh Dickins
2014-06-26 11:27 ` Konstantin Khlebnikov
2014-06-24 20:16 ` Konstantin Khlebnikov [this message]
2014-06-25 22:03 ` [PATCH 3/3] mm: catch memory commitment underflow Andrew Morton
2014-06-26 4:08 ` Konstantin Khlebnikov
2014-06-25 22:23 ` Dave Hansen
2015-01-18 11:34 ` Sasha Levin
2015-01-18 18:36 ` Konstantin Khlebnikov
2015-04-25 2:15 ` Sasha Levin
2015-06-07 14:29 ` Sasha Levin
2014-06-26 3:44 ` [PATCH 1/3] shmem: fix double uncharge in __shmem_file_setup() Hugh Dickins
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