The patch titled
Subject: mm: catch memory commitment underflow
has been added to the -mm tree. Its filename is
mm-catch-memory-commitment-underflow.patch
This patch should soon appear at
http://ozlabs.org/~akpm/mmots/broken-out/mm-catch-memory-commitment-underflow.patch
and later at
http://ozlabs.org/~akpm/mmotm/broken-out/mm-catch-memory-commitment-underflow.patch
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------------------------------------------------------
From: Konstantin Khlebnikov <koct9i@xxxxxxxxx>
Subject: mm: catch memory commitment underflow
Print a warning (if CONFIG_DEBUG_VM=y) when memory commitment becomes too
negative.
This shouldn't happen any more - the previous two patches fixed the
committed_as underflow issues.
Signed-off-by: Konstantin Khlebnikov <koct9i@xxxxxxxxx>
Cc: Hugh Dickins <hughd@xxxxxxxxxx>
Signed-off-by: Andrew Morton <akpm@xxxxxxxxxxxxxxxxxxxx>
---
mm/mmap.c | 6 ++++++
1 file changed, 6 insertions(+)
diff -puN mm/mmap.c~mm-catch-memory-commitment-underflow mm/mmap.c
--- a/mm/mmap.c~mm-catch-memory-commitment-underflow
+++ a/mm/mmap.c
@@ -134,6 +134,12 @@ int __vm_enough_memory(struct mm_struct
{
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);
/*
_
Patches currently in -mm which might be from koct9i@xxxxxxxxx are
origin.patch
mm-memoryc-use-entry-=-access_oncepte-in-handle_pte_fault.patch
shmem-fix-double-uncharge-in-__shmem_file_setup.patch
shmem-update-memory-reservation-on-truncate.patch
mm-catch-memory-commitment-underflow.patch
lib-idr-fix-out-of-bounds-pointer-dereference.patch
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