diff options
Diffstat (limited to 'mm/oom_kill.c')
| -rw-r--r-- | mm/oom_kill.c | 62 |
1 files changed, 38 insertions, 24 deletions
diff --git a/mm/oom_kill.c b/mm/oom_kill.c index 2e3ce3a928b9..b278b8d60eee 100644 --- a/mm/oom_kill.c +++ b/mm/oom_kill.c @@ -61,12 +61,6 @@ unsigned long badness(struct task_struct *p, unsigned long uptime) } /* - * swapoff can easily use up all memory, so kill those first. - */ - if (p->flags & PF_SWAPOFF) - return ULONG_MAX; - - /* * The memory size of the process is the basis for the badness. */ points = mm->total_vm; @@ -77,6 +71,12 @@ unsigned long badness(struct task_struct *p, unsigned long uptime) task_unlock(p); /* + * swapoff can easily use up all memory, so kill those first. + */ + if (p->flags & PF_SWAPOFF) + return ULONG_MAX; + + /* * Processes which fork a lot of child processes are likely * a good choice. We add half the vmsize of the children if they * have an own mm. This prevents forking servers to flood the @@ -174,10 +174,15 @@ static inline int constrained_alloc(struct zonelist *zonelist, gfp_t gfp_mask) { #ifdef CONFIG_NUMA struct zone **z; - nodemask_t nodes = node_online_map; + nodemask_t nodes; + int node; + /* node has memory ? */ + for_each_online_node(node) + if (NODE_DATA(node)->node_present_pages) + node_set(node, nodes); for (z = zonelist->zones; *z; z++) - if (cpuset_zone_allowed(*z, gfp_mask)) + if (cpuset_zone_allowed_softwall(*z, gfp_mask)) node_clear(zone_to_nid(*z), nodes); else return CONSTRAINT_CPUSET; @@ -264,7 +269,7 @@ static struct task_struct *select_bad_process(unsigned long *ppoints) * flag though it's unlikely that we select a process with CAP_SYS_RAW_IO * set. */ -static void __oom_kill_task(struct task_struct *p, const char *message) +static void __oom_kill_task(struct task_struct *p, int verbose) { if (is_init(p)) { WARN_ON(1); @@ -278,10 +283,8 @@ static void __oom_kill_task(struct task_struct *p, const char *message) return; } - if (message) { - printk(KERN_ERR "%s: Killed process %d (%s).\n", - message, p->pid, p->comm); - } + if (verbose) + printk(KERN_ERR "Killed process %d (%s)\n", p->pid, p->comm); /* * We give our sacrificial lamb high priority and access to @@ -294,7 +297,7 @@ static void __oom_kill_task(struct task_struct *p, const char *message) force_sig(SIGKILL, p); } -static int oom_kill_task(struct task_struct *p, const char *message) +static int oom_kill_task(struct task_struct *p) { struct mm_struct *mm; struct task_struct *g, *q; @@ -313,15 +316,25 @@ static int oom_kill_task(struct task_struct *p, const char *message) if (mm == NULL) return 1; - __oom_kill_task(p, message); + /* + * Don't kill the process if any threads are set to OOM_DISABLE + */ + do_each_thread(g, q) { + if (q->mm == mm && p->oomkilladj == OOM_DISABLE) + return 1; + } while_each_thread(g, q); + + __oom_kill_task(p, 1); + /* * kill all processes that share the ->mm (i.e. all threads), - * but are in a different thread group + * but are in a different thread group. Don't let them have access + * to memory reserves though, otherwise we might deplete all memory. */ - do_each_thread(g, q) + do_each_thread(g, q) { if (q->mm == mm && q->tgid != p->tgid) - __oom_kill_task(q, message); - while_each_thread(g, q); + force_sig(SIGKILL, p); + } while_each_thread(g, q); return 0; } @@ -337,21 +350,22 @@ static int oom_kill_process(struct task_struct *p, unsigned long points, * its children or threads, just set TIF_MEMDIE so it can die quickly */ if (p->flags & PF_EXITING) { - __oom_kill_task(p, NULL); + __oom_kill_task(p, 0); return 0; } - printk(KERN_ERR "Out of Memory: Kill process %d (%s) score %li" - " and children.\n", p->pid, p->comm, points); + printk(KERN_ERR "%s: kill process %d (%s) score %li or a child\n", + message, p->pid, p->comm, points); + /* Try to kill a child first */ list_for_each(tsk, &p->children) { c = list_entry(tsk, struct task_struct, sibling); if (c->mm == p->mm) continue; - if (!oom_kill_task(c, message)) + if (!oom_kill_task(c)) return 0; } - return oom_kill_task(p, message); + return oom_kill_task(p); } static BLOCKING_NOTIFIER_HEAD(oom_notify_list); |