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Subject[PATCH v4 001/002] mm: limit growth of 3% hardcoded other user reserve
Limit the growth of the memory reserved for other processes
to the smaller of 3% or 8MB.

This affects only OVERCOMMIT_NEVER.

Signed-off-by: Andrew Shewmaker <agshew@gmail.com>

---

Rebased onto v3.8-mmotm-2013-03-01-15-50

No longer assumes 4kb pages.
Code duplicated for nommu.

diff --git a/mm/mmap.c b/mm/mmap.c
index 49dc7d5..4eb2b1a 100644
--- a/mm/mmap.c
+++ b/mm/mmap.c
@@ -184,9 +184,11 @@ int __vm_enough_memory(struct mm_struct *mm, long pages, int cap_sys_admin)
allowed += total_swap_pages;

/* Don't let a single process grow too big:
- leave 3% of the size of this process for other processes */
+ * leave the smaller of 3% of the size of this process
+ * or 8MB for other processes
+ */
if (mm)
- allowed -= mm->total_vm / 32;
+ allowed -= min(mm->total_vm / 32, 1 << (23 - PAGE_SHIFT));

if (percpu_counter_read_positive(&vm_committed_as) < allowed)
return 0;
diff --git a/mm/nommu.c b/mm/nommu.c
index f5d57a3..a93d214 100644
--- a/mm/nommu.c
+++ b/mm/nommu.c
@@ -1945,9 +1945,11 @@ int __vm_enough_memory(struct mm_struct *mm, long pages, int cap_sys_admin)
allowed += total_swap_pages;

/* Don't let a single process grow too big:
- leave 3% of the size of this process for other processes */
+ * leave the smaller of 3% of the size of this process
+ * or 8MB for other processes
+ */
if (mm)
- allowed -= mm->total_vm / 32;
+ allowed -= min(mm->total_vm / 32, 1 << (23 - PAGE_SHIFT));

if (percpu_counter_read_positive(&vm_committed_as) < allowed)
return 0;

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