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mm: factor commit limit calculation

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The same calculation is currently done in three differents places.
Factor that code so future changes has to be made at only one place.

[[email protected]: uninline vm_commit_limit()]
Signed-off-by: Jerome Marchand <[email protected]>
Cc: Dave Hansen <[email protected]>
Cc: Michal Hocko <[email protected]>
Signed-off-by: Andrew Morton <[email protected]>
Signed-off-by: Linus Torvalds <[email protected]>
This commit is contained in:
Jerome Marchand 2013-11-12 15:08:31 -08:00 • committed by Linus Torvalds
commit 00619bcc44
5 changed files with 18 additions and 9 deletions
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13
mm/util.c
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@ -7,6 +7,9 @@
#include <linux/security.h>
#include <linux/swap.h>
#include <linux/swapops.h>
#include <linux/mman.h>
#include <linux/hugetlb.h>
#include <asm/uaccess.h>
#include "internal.h"
@ -398,6 +401,16 @@ struct address_space *page_mapping(struct page *page)
return mapping;
}
/*
* Committed memory limit enforced when OVERCOMMIT_NEVER policy is used
*/
unsigned long vm_commit_limit(void)
{
return ((totalram_pages - hugetlb_total_pages())
* sysctl_overcommit_ratio / 100) + total_swap_pages;
}
/* Tracepoints definitions. */
EXPORT_TRACEPOINT_SYMBOL(kmalloc);
EXPORT_TRACEPOINT_SYMBOL(kmem_cache_alloc);