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| author | K. Y. Srinivasan <kys@microsoft.com> | 2012-11-15 14:34:42 -0800 |
|---|---|---|
| committer | Greg Kroah-Hartman <gregkh@linuxfoundation.org> | 2012-11-15 15:41:22 -0800 |
| commit | 997071bcb34005f42e0fe5bc7930e895b070f251 (patch) | |
| tree | 7cc8056370e1c77314fdf0b3fd72bcc69743f24c /include/linux | |
| parent | d892de8d3fb1e807de561289cfb1fed42950440a (diff) | |
| download | linux-997071bcb34005f42e0fe5bc7930e895b070f251.tar.gz linux-997071bcb34005f42e0fe5bc7930e895b070f251.tar.bz2 linux-997071bcb34005f42e0fe5bc7930e895b070f251.zip | |
mm: export a function to get vm committed memory
It will be useful to be able to access global memory commitment from
device drivers. On the Hyper-V platform, the host has a policy engine to
balance the available physical memory amongst all competing virtual
machines hosted on a given node. This policy engine is driven by a number
of metrics including the memory commitment reported by the guests. The
balloon driver for Linux on Hyper-V will use this function to retrieve
guest memory commitment. This function is also used in Xen self
ballooning code.
[akpm@linux-foundation.org: coding-style tweak]
Signed-off-by: K. Y. Srinivasan <kys@microsoft.com>
Acked-by: David Rientjes <rientjes@google.com>
Acked-by: Dan Magenheimer <dan.magenheimer@oracle.com>
Cc: Konrad Rzeszutek Wilk <konrad.wilk@oracle.com>
Cc: Jeremy Fitzhardinge <jeremy@goop.org>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
Diffstat (limited to 'include/linux')
| -rw-r--r-- | include/linux/mman.h | 2 |
1 files changed, 2 insertions, 0 deletions
diff --git a/include/linux/mman.h b/include/linux/mman.h index d09dde1e57fb..9aa863da287f 100644 --- a/include/linux/mman.h +++ b/include/linux/mman.h @@ -11,6 +11,8 @@ extern int sysctl_overcommit_memory; extern int sysctl_overcommit_ratio; extern struct percpu_counter vm_committed_as; +unsigned long vm_memory_committed(void); + static inline void vm_acct_memory(long pages) { percpu_counter_add(&vm_committed_as, pages); |