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.

[ use VM_WARN_ONCE, per Dave]
Signed-off-by: default avatarKonstantin Khlebnikov <>
Cc: Hugh Dickins <>
Cc: Dave Hansen <>
Signed-off-by: default avatarAndrew Morton <>
Signed-off-by: default avatarLinus Torvalds <>
parent 77142517
......@@ -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");
Markdown is supported
0% or .
You are about to add 0 people to the discussion. Proceed with caution.
Finish editing this message first!
Please register or to comment