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Message-Id: <1376925478-15506-1-git-send-email-jmarchan@redhat.com>
Date: Mon, 19 Aug 2013 17:17:57 +0200
From: Jerome Marchand <jmarchan@...hat.com>
To: linux-mm@...ck.org
Cc: linux-kernel@...r.kernel.org
Subject: [PATCH 1/2] mm: factor commit limit calculation
The same calculation is currently done in three different places.
Factor that code so future changes has to be made at only one place.
Signed-of-by: Jerome Marchand <jmarchan@...hat.com>
---
fs/proc/meminfo.c | 5 +----
include/linux/mman.h | 12 ++++++++++++
mm/mmap.c | 4 +---
mm/nommu.c | 3 +--
4 files changed, 15 insertions(+), 9 deletions(-)
diff --git a/fs/proc/meminfo.c b/fs/proc/meminfo.c
index 5aa847a..6f7767d 100644
--- a/fs/proc/meminfo.c
+++ b/fs/proc/meminfo.c
@@ -24,7 +24,6 @@ static int meminfo_proc_show(struct seq_file *m, void *v)
{
struct sysinfo i;
unsigned long committed;
- unsigned long allowed;
struct vmalloc_info vmi;
long cached;
unsigned long pages[NR_LRU_LISTS];
@@ -37,8 +36,6 @@ static int meminfo_proc_show(struct seq_file *m, void *v)
si_meminfo(&i);
si_swapinfo(&i);
committed = percpu_counter_read_positive(&vm_committed_as);
- allowed = ((totalram_pages - hugetlb_total_pages())
- * sysctl_overcommit_ratio / 100) + total_swap_pages;
cached = global_page_state(NR_FILE_PAGES) -
total_swapcache_pages() - i.bufferram;
@@ -153,7 +150,7 @@ static int meminfo_proc_show(struct seq_file *m, void *v)
K(global_page_state(NR_UNSTABLE_NFS)),
K(global_page_state(NR_BOUNCE)),
K(global_page_state(NR_WRITEBACK_TEMP)),
- K(allowed),
+ K(vm_commit_limit()),
K(committed),
(unsigned long)VMALLOC_TOTAL >> 10,
vmi.used >> 10,
diff --git a/include/linux/mman.h b/include/linux/mman.h
index 92dc257..d622d34 100644
--- a/include/linux/mman.h
+++ b/include/linux/mman.h
@@ -7,6 +7,9 @@
#include <linux/atomic.h>
#include <uapi/linux/mman.h>
+#include <linux/hugetlb.h>
+#include <linux/swap.h>
+
extern int sysctl_overcommit_memory;
extern int sysctl_overcommit_ratio;
extern struct percpu_counter vm_committed_as;
@@ -87,4 +90,13 @@ calc_vm_flag_bits(unsigned long flags)
_calc_vm_trans(flags, MAP_DENYWRITE, VM_DENYWRITE ) |
_calc_vm_trans(flags, MAP_LOCKED, VM_LOCKED );
}
+
+/*
+ * Commited memory limit enforced when OVERCOMMIT_NEVER policy is used
+ */
+static inline unsigned long vm_commit_limit()
+{
+ return ((totalram_pages - hugetlb_total_pages())
+ * sysctl_overcommit_ratio / 100) + total_swap_pages;
+}
#endif /* _LINUX_MMAN_H */
diff --git a/mm/mmap.c b/mm/mmap.c
index 1edbaa3..06c98f8 100644
--- a/mm/mmap.c
+++ b/mm/mmap.c
@@ -179,14 +179,12 @@ int __vm_enough_memory(struct mm_struct *mm, long pages, int cap_sys_admin)
goto error;
}
- allowed = (totalram_pages - hugetlb_total_pages())
- * sysctl_overcommit_ratio / 100;
+ allowed = vm_commit_limit();
/*
* Reserve some for root
*/
if (!cap_sys_admin)
allowed -= sysctl_admin_reserve_kbytes >> (PAGE_SHIFT - 10);
- allowed += total_swap_pages;
/*
* Don't let a single process grow so big a user can't recover
diff --git a/mm/nommu.c b/mm/nommu.c
index ecd1f15..d8a957b 100644
--- a/mm/nommu.c
+++ b/mm/nommu.c
@@ -1948,13 +1948,12 @@ int __vm_enough_memory(struct mm_struct *mm, long pages, int cap_sys_admin)
goto error;
}
- allowed = totalram_pages * sysctl_overcommit_ratio / 100;
+ allowed = vm_commit_limit();
/*
* Reserve some 3% for root
*/
if (!cap_sys_admin)
allowed -= sysctl_admin_reserve_kbytes >> (PAGE_SHIFT - 10);
- allowed += total_swap_pages;
/*
* Don't let a single process grow so big a user can't recover
--
1.7.7.6
--
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