diff options
| author | Jerome Marchand <jmarchan@redhat.com> | 2014-01-10 12:41:03 +1100 |
|---|---|---|
| committer | Stephen Rothwell <sfr@canb.auug.org.au> | 2014-01-10 12:41:03 +1100 |
| commit | fc0d3b25a0cffcb906a5d4ea5f14a1353dc637dc (patch) | |
| tree | 1dde063850e80c9d8d6e45d276221281f8d78e2d /kernel | |
| parent | 39c5e43e2e64287ed60dd0f7bd1281b6402bec01 (diff) | |
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.
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>
Diffstat (limited to 'kernel')
| -rw-r--r-- | kernel/sysctl.c | 10 |
1 files changed, 9 insertions, 1 deletions
diff --git a/kernel/sysctl.c b/kernel/sysctl.c index 34a604726d0b..787792905751 100644 --- a/kernel/sysctl.c +++ b/kernel/sysctl.c @@ -97,6 +97,7 @@ /* External variables not in a header file. */ extern int sysctl_overcommit_memory; extern int sysctl_overcommit_ratio; +extern unsigned long sysctl_overcommit_kbytes; extern int max_threads; extern int suid_dumpable; #ifdef CONFIG_COREDUMP @@ -1128,7 +1129,14 @@ static struct ctl_table vm_table[] = { .data = &sysctl_overcommit_ratio, .maxlen = sizeof(sysctl_overcommit_ratio), .mode = 0644, - .proc_handler = proc_dointvec, + .proc_handler = overcommit_ratio_handler, + }, + { + .procname = "overcommit_kbytes", + .data = &sysctl_overcommit_kbytes, + .maxlen = sizeof(sysctl_overcommit_kbytes), + .mode = 0644, + .proc_handler = overcommit_kbytes_handler, }, { .procname = "page-cluster", |