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Commit 82f71ae4 authored by Konstantin Khlebnikov's avatar Konstantin Khlebnikov Committed by Linus Torvalds
Browse files

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.

[akpm@linux-foundation.org: use VM_WARN_ONCE, per Dave]
Signed-off-by: default avatarKonstantin Khlebnikov <koct9i@gmail.com>
Cc: Hugh Dickins <hughd@google.com>
Cc: Dave Hansen <dave.hansen@intel.com>
Signed-off-by: default avatarAndrew Morton <akpm@linux-foundation.org>
Signed-off-by: default avatarLinus Torvalds <torvalds@linux-foundation.org>
parent 77142517

mm/mmap.c

+5 −0
Original line number Diff line number Diff line
@@ -31,6 +31,7 @@ 
#include <linux/mempolicy.h>

#include <linux/rmap.h>

#include <linux/mmu_notifier.h>

#include <linux/mmdebug.h>

#include <linux/perf_event.h>

#include <linux/audit.h>

#include <linux/khugepaged.h>
@@ -134,6 +135,10 @@ int __vm_enough_memory(struct mm_struct *mm, long pages, int cap_sys_admin) 
{

	unsigned long free, allowed, reserve;



	VM_WARN_ONCE(percpu_counter_read(&vm_committed_as) <

			-(s64)vm_committed_as_batch * num_online_cpus(),

			"memory commitment underflow");



	vm_acct_memory(pages);



	/*