diff options
| author | Sebastian Frias <sf84@laposte.net> | 2016-05-11 09:51:49 +1000 |
|---|---|---|
| committer | Stephen Rothwell <sfr@canb.auug.org.au> | 2016-05-13 13:24:40 +1000 |
| commit | 6002b567dec503be8e4f4185595c4fe557655989 (patch) | |
| tree | 08894729ea8730a1337c2d62c8b1b2c731d950b0 /mm/util.c | |
| parent | 3a82bd62e3e73107c5c74624b7dc2cd9e738e5e6 (diff) | |
mm: add config option to select the initial overcommit mode
Currently the initial value of the overcommit mode is OVERCOMMIT_GUESS.
However, on embedded systems it is usually better to disable overcommit to
avoid waking up the OOM-killer and its well known undesirable
side-effects.
This config option allows to setup the initial overcommit mode to any of
the 3 available values, OVERCOMMIT_GUESS (which remains as default),
OVERCOMMIT_ALWAYS and OVERCOMMIT_NEVER. The overcommit mode can still be
changed thru sysctl after the system boots up.
This config option depends on CONFIG_EXPERT.
This patch does not introduces functional changes.
Link: http://lkml.kernel.org/r/5731CC6E.3080807@laposte.net
Signed-off-by: Sebastian Frias <sf84@laposte.net>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Diffstat (limited to 'mm/util.c')
| -rw-r--r-- | mm/util.c | 6 |
1 files changed, 6 insertions, 0 deletions
diff --git a/mm/util.c b/mm/util.c index 8a1b3a1fb595..6682eb92ccca 100644 --- a/mm/util.c +++ b/mm/util.c @@ -417,7 +417,13 @@ int __page_mapcount(struct page *page) } EXPORT_SYMBOL_GPL(__page_mapcount); +#if defined(CONFIG_OVERCOMMIT_NEVER) +int sysctl_overcommit_memory __read_mostly = OVERCOMMIT_NEVER; +#elif defined(CONFIG_OVERCOMMIT_ALWAYS) +int sysctl_overcommit_memory __read_mostly = OVERCOMMIT_ALWAYS; +#else int sysctl_overcommit_memory __read_mostly = OVERCOMMIT_GUESS; +#endif int sysctl_overcommit_ratio __read_mostly = 50; unsigned long sysctl_overcommit_kbytes __read_mostly; int sysctl_max_map_count __read_mostly = DEFAULT_MAX_MAP_COUNT; |