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Memory controller: OOM handling

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Out of memory handling for cgroups over their limit. A task from the
cgroup over limit is chosen using the existing OOM logic and killed.

TODO:
1. As discussed in the OLS BOF session, consider implementing a user
space policy for OOM handling.

[akpm@linux-foundation.org: fix build due to oom-killer changes]
Signed-off-by: Pavel Emelianov <xemul@openvz.org>
Signed-off-by: Balbir Singh <balbir@linux.vnet.ibm.com>
Cc: Paul Menage <menage@google.com>
Cc: Peter Zijlstra <a.p.zijlstra@chello.nl>
Cc: "Eric W. Biederman" <ebiederm@xmission.com>
Cc: Nick Piggin <nickpiggin@yahoo.com.au>
Cc: Kirill Korotaev <dev@sw.ru>
Cc: Herbert Poetzl <herbert@13thfloor.at>
Cc: David Rientjes <rientjes@google.com>
Cc: Vaidyanathan Srinivasan <svaidy@linux.vnet.ibm.com>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
This commit is contained in:
Pavel Emelianov 2008-02-07 00:13:58 -08:00 committed by Linus Torvalds
parent 0eea103017
commit c7ba5c9e81
3 changed files with 41 additions and 4 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

1
include/linux/memcontrol.h
View File

@ -39,6 +39,7 @@ extern unsigned long mem_cgroup_isolate_pages(unsigned long nr_to_scan,
int mode, struct zone *z,
struct mem_cgroup *mem_cont,
int active);
extern void mem_cgroup_out_of_memory(struct mem_cgroup *mem, gfp_t gfp_mask);
static inline void mem_cgroup_uncharge_page(struct page *page)
{

1
mm/memcontrol.c
View File

@ -329,6 +329,7 @@ retry:
}
css_put(&mem->css);
mem_cgroup_out_of_memory(mem, GFP_KERNEL);
goto free_pc;
}

43
mm/oom_kill.c
View File

@ -25,6 +25,7 @@
#include <linux/cpuset.h>
#include <linux/module.h>
#include <linux/notifier.h>
#include <linux/memcontrol.h>
int sysctl_panic_on_oom;
int sysctl_oom_kill_allocating_task;
@ -50,7 +51,8 @@ static DEFINE_SPINLOCK(zone_scan_mutex);
* of least surprise ... (be careful when you change it)
*/
unsigned long badness(struct task_struct *p, unsigned long uptime)
unsigned long badness(struct task_struct *p, unsigned long uptime,
struct mem_cgroup *mem)
{
unsigned long points, cpu_time, run_time, s;
struct mm_struct *mm;
@ -63,6 +65,13 @@ unsigned long badness(struct task_struct *p, unsigned long uptime)
return 0;
}
#ifdef CONFIG_CGROUP_MEM_CONT
if (mem != NULL && mm->mem_cgroup != mem) {
task_unlock(p);
return 0;
}
#endif
/*
* The memory size of the process is the basis for the badness.
*/
@ -193,7 +202,8 @@ static inline enum oom_constraint constrained_alloc(struct zonelist *zonelist,
*
* (not docbooked, we don't want this one cluttering up the manual)
*/
static struct task_struct *select_bad_process(unsigned long *ppoints)
static struct task_struct *select_bad_process(unsigned long *ppoints,
struct mem_cgroup *mem)
{
struct task_struct *g, *p;
struct task_struct *chosen = NULL;
@ -247,7 +257,7 @@ static struct task_struct *select_bad_process(unsigned long *ppoints)
if (p->oomkilladj == OOM_DISABLE)
continue;
points = badness(p, uptime.tv_sec);
points = badness(p, uptime.tv_sec, mem);
if (points > *ppoints || !chosen) {
chosen = p;
*ppoints = points;
@ -368,6 +378,31 @@ static int oom_kill_process(struct task_struct *p, gfp_t gfp_mask, int order,
return oom_kill_task(p);
}
#ifdef CONFIG_CGROUP_MEM_CONT
void mem_cgroup_out_of_memory(struct mem_cgroup *mem, gfp_t gfp_mask)
{
unsigned long points = 0;
struct task_struct *p;
cgroup_lock();
rcu_read_lock();
retry:
p = select_bad_process(&points, mem);
if (PTR_ERR(p) == -1UL)
goto out;
if (!p)
p = current;
if (oom_kill_process(p, gfp_mask, 0, points,
"Memory cgroup out of memory"))
goto retry;
out:
rcu_read_unlock();
cgroup_unlock();
}
#endif
static BLOCKING_NOTIFIER_HEAD(oom_notify_list);
int register_oom_notifier(struct notifier_block *nb)
@ -484,7 +519,7 @@ retry:
* Rambo mode: Shoot down a process and hope it solves whatever
* issues we may have.
*/
p = select_bad_process(&points);
p = select_bad_process(&points, NULL);
if (PTR_ERR(p) == -1UL)
goto out;