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| author | Jerome Marchand <jmarchan@redhat.com> | 2014-01-21 15:49:14 -0800 |
|---|---|---|
| committer | Linus Torvalds <torvalds@linux-foundation.org> | 2014-01-21 16:19:44 -0800 |
| commit | 49f0ce5f92321cdcf741e35f385669a421013cb7 (patch) | |
| tree | d41c5a2283b32be69840cb8722ffd8cd8c38a1b0 /include/linux/mman.h | |
| parent | aec6a8889a98a0cd58357cd0937a25189908f191 (diff) | |
| download | lwn-49f0ce5f92321cdcf741e35f385669a421013cb7.tar.gz lwn-49f0ce5f92321cdcf741e35f385669a421013cb7.zip | |
mm: add overcommit_kbytes sysctl variable
Some applications that run on HPC clusters are designed around the
availability of RAM and the overcommit ratio is fine tuned to get the
maximum usage of memory without swapping. With growing memory, the
1%-of-all-RAM grain provided by overcommit_ratio has become too coarse
for these workload (on a 2TB machine it represents no less than 20GB).
This patch adds the new overcommit_kbytes sysctl variable that allow a
much finer grain.
[akpm@linux-foundation.org: coding-style fixes]
[akpm@linux-foundation.org: fix nommu build]
Signed-off-by: Jerome Marchand <jmarchan@redhat.com>
Cc: Dave Hansen <dave.hansen@linux.intel.com>
Cc: Alan Cox <alan@lxorguk.ukuu.org.uk>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
Diffstat (limited to 'include/linux/mman.h')
| -rw-r--r-- | include/linux/mman.h | 1 |
1 files changed, 1 insertions, 0 deletions
diff --git a/include/linux/mman.h b/include/linux/mman.h index 7f7f8dae4b1d..16373c8f5f57 100644 --- a/include/linux/mman.h +++ b/include/linux/mman.h @@ -9,6 +9,7 @@ extern int sysctl_overcommit_memory; extern int sysctl_overcommit_ratio; +extern unsigned long sysctl_overcommit_kbytes; extern struct percpu_counter vm_committed_as; #ifdef CONFIG_SMP |