diff options
Diffstat (limited to 'mm/oom_kill.c')
| -rw-r--r-- | mm/oom_kill.c | 22 |
1 files changed, 22 insertions, 0 deletions
diff --git a/mm/oom_kill.c b/mm/oom_kill.c index b9af136e5cfa..7d056843fa2d 100644 --- a/mm/oom_kill.c +++ b/mm/oom_kill.c @@ -21,6 +21,8 @@ #include <linux/timex.h> #include <linux/jiffies.h> #include <linux/cpuset.h> +#include <linux/module.h> +#include <linux/notifier.h> int sysctl_panic_on_oom; /* #define DEBUG */ @@ -306,6 +308,20 @@ static int oom_kill_process(struct task_struct *p, unsigned long points, return oom_kill_task(p, message); } +static BLOCKING_NOTIFIER_HEAD(oom_notify_list); + +int register_oom_notifier(struct notifier_block *nb) +{ + return blocking_notifier_chain_register(&oom_notify_list, nb); +} +EXPORT_SYMBOL_GPL(register_oom_notifier); + +int unregister_oom_notifier(struct notifier_block *nb) +{ + return blocking_notifier_chain_unregister(&oom_notify_list, nb); +} +EXPORT_SYMBOL_GPL(unregister_oom_notifier); + /** * out_of_memory - kill the "best" process when we run out of memory * @@ -318,6 +334,12 @@ void out_of_memory(struct zonelist *zonelist, gfp_t gfp_mask, int order) { struct task_struct *p; unsigned long points = 0; + unsigned long freed = 0; + + blocking_notifier_call_chain(&oom_notify_list, 0, &freed); + if (freed > 0) + /* Got some memory back in the last second. */ + return; if (printk_ratelimit()) { printk("oom-killer: gfp_mask=0x%x, order=%d\n", |