#include <linux/timex.h>
#include <linux/jiffies.h>
#include <linux/cpuset.h>
-#include <linux/module.h>
+#include <linux/export.h>
#include <linux/notifier.h>
#include <linux/memcontrol.h>
#include <linux/mempolicy.h>
#include <linux/security.h>
#include <linux/ptrace.h>
+#include <linux/freezer.h>
+#include <linux/ftrace.h>
+#include <linux/ratelimit.h>
+
+#define CREATE_TRACE_POINTS
+#include <trace/events/oom.h>
int sysctl_panic_on_oom;
int sysctl_oom_kill_allocating_task;
int sysctl_oom_dump_tasks = 1;
static DEFINE_SPINLOCK(zone_scan_lock);
-/**
- * test_set_oom_score_adj() - set current's oom_score_adj and return old value
- * @new_val: new oom_score_adj value
- *
- * Sets the oom_score_adj value for current to @new_val with proper
- * synchronization and returns the old value. Usually used to temporarily
- * set a value, save the old value in the caller, and then reinstate it later.
- */
-int test_set_oom_score_adj(int new_val)
-{
- struct sighand_struct *sighand = current->sighand;
- int old_val;
-
- spin_lock_irq(&sighand->siglock);
- old_val = current->signal->oom_score_adj;
- if (new_val != old_val) {
- if (new_val == OOM_SCORE_ADJ_MIN)
- atomic_inc(¤t->mm->oom_disable_count);
- else if (old_val == OOM_SCORE_ADJ_MIN)
- atomic_dec(¤t->mm->oom_disable_count);
- current->signal->oom_score_adj = new_val;
- }
- spin_unlock_irq(&sighand->siglock);
-
- return old_val;
-}
-
#ifdef CONFIG_NUMA
/**
* has_intersects_mems_allowed() - check task eligiblity for kill
/* return true if the task is not adequate as candidate victim task. */
static bool oom_unkillable_task(struct task_struct *p,
- const struct mem_cgroup *mem, const nodemask_t *nodemask)
+ const struct mem_cgroup *memcg, const nodemask_t *nodemask)
{
if (is_global_init(p))
return true;
return true;
/* When mem_cgroup_out_of_memory() and p is not member of the group */
- if (mem && !task_in_mem_cgroup(p, mem))
+ if (memcg && !task_in_mem_cgroup(p, memcg))
return true;
/* p may not have freeable memory in nodemask */
* predictable as possible. The goal is to return the highest value for the
* task consuming the most memory to avoid subsequent oom failures.
*/
-unsigned int oom_badness(struct task_struct *p, struct mem_cgroup *mem,
- const nodemask_t *nodemask, unsigned long totalpages)
+unsigned long oom_badness(struct task_struct *p, struct mem_cgroup *memcg,
+ const nodemask_t *nodemask, unsigned long totalpages)
{
- int points;
+ long points;
+ long adj;
- if (oom_unkillable_task(p, mem, nodemask))
+ if (oom_unkillable_task(p, memcg, nodemask))
return 0;
p = find_lock_task_mm(p);
if (!p)
return 0;
- /*
- * Shortcut check for a thread sharing p->mm that is OOM_SCORE_ADJ_MIN
- * so the entire heuristic doesn't need to be executed for something
- * that cannot be killed.
- */
- if (atomic_read(&p->mm->oom_disable_count)) {
+ adj = (long)p->signal->oom_score_adj;
+ if (adj == OOM_SCORE_ADJ_MIN) {
task_unlock(p);
return 0;
}
- /*
- * The memory controller may have a limit of 0 bytes, so avoid a divide
- * by zero, if necessary.
- */
- if (!totalpages)
- totalpages = 1;
-
/*
* The baseline for the badness score is the proportion of RAM that each
* task's rss, pagetable and swap space use.
*/
- points = get_mm_rss(p->mm) + p->mm->nr_ptes;
- points += get_mm_counter(p->mm, MM_SWAPENTS);
-
- points *= 1000;
- points /= totalpages;
+ points = get_mm_rss(p->mm) + p->mm->nr_ptes +
+ get_mm_counter(p->mm, MM_SWAPENTS);
task_unlock(p);
/*
* implementation used by LSMs.
*/
if (has_capability_noaudit(p, CAP_SYS_ADMIN))
- points -= 30;
+ points -= (points * 3) / 100;
- /*
- * /proc/pid/oom_score_adj ranges from -1000 to +1000 such that it may
- * either completely disable oom killing or always prefer a certain
- * task.
- */
- points += p->signal->oom_score_adj;
+ /* Normalize to oom_score_adj units */
+ adj *= totalpages / 1000;
+ points += adj;
/*
- * Never return 0 for an eligible task that may be killed since it's
- * possible that no single user task uses more than 0.1% of memory and
- * no single admin tasks uses more than 3.0%.
+ * Never return 0 for an eligible task regardless of the root bonus and
+ * oom_score_adj (oom_score_adj can't be OOM_SCORE_ADJ_MIN here).
*/
- if (points <= 0)
- return 1;
- return (points < 1000) ? points : 1000;
+ return points > 0 ? points : 1;
}
/*
* the page allocator means a mempolicy is in effect. Cpuset policy
* is enforced in get_page_from_freelist().
*/
- if (nodemask && !nodes_subset(node_states[N_HIGH_MEMORY], *nodemask)) {
+ if (nodemask && !nodes_subset(node_states[N_MEMORY], *nodemask)) {
*totalpages = total_swap_pages;
for_each_node_mask(nid, *nodemask)
*totalpages += node_spanned_pages(nid);
}
#endif
+enum oom_scan_t oom_scan_process_thread(struct task_struct *task,
+ unsigned long totalpages, const nodemask_t *nodemask,
+ bool force_kill)
+{
+ if (task->exit_state)
+ return OOM_SCAN_CONTINUE;
+ if (oom_unkillable_task(task, NULL, nodemask))
+ return OOM_SCAN_CONTINUE;
+
+ /*
+ * This task already has access to memory reserves and is being killed.
+ * Don't allow any other task to have access to the reserves.
+ */
+ if (test_tsk_thread_flag(task, TIF_MEMDIE)) {
+ if (unlikely(frozen(task)))
+ __thaw_task(task);
+ if (!force_kill)
+ return OOM_SCAN_ABORT;
+ }
+ if (!task->mm)
+ return OOM_SCAN_CONTINUE;
+
+ /*
+ * If task is allocating a lot of memory and has been marked to be
+ * killed first if it triggers an oom, then select it.
+ */
+ if (oom_task_origin(task))
+ return OOM_SCAN_SELECT;
+
+ if (task->flags & PF_EXITING && !force_kill) {
+ /*
+ * If this task is not being ptraced on exit, then wait for it
+ * to finish before killing some other task unnecessarily.
+ */
+ if (!(task->group_leader->ptrace & PT_TRACE_EXIT))
+ return OOM_SCAN_ABORT;
+ }
+ return OOM_SCAN_OK;
+}
+
/*
* Simple selection loop. We chose the process with the highest
- * number of 'points'. We expect the caller will lock the tasklist.
+ * number of 'points'.
*
* (not docbooked, we don't want this one cluttering up the manual)
*/
static struct task_struct *select_bad_process(unsigned int *ppoints,
- unsigned long totalpages, struct mem_cgroup *mem,
- const nodemask_t *nodemask)
+ unsigned long totalpages, const nodemask_t *nodemask,
+ bool force_kill)
{
struct task_struct *g, *p;
struct task_struct *chosen = NULL;
- *ppoints = 0;
+ unsigned long chosen_points = 0;
+ rcu_read_lock();
do_each_thread(g, p) {
unsigned int points;
- if (!p->mm)
- continue;
- if (oom_unkillable_task(p, mem, nodemask))
+ switch (oom_scan_process_thread(p, totalpages, nodemask,
+ force_kill)) {
+ case OOM_SCAN_SELECT:
+ chosen = p;
+ chosen_points = ULONG_MAX;
+ /* fall through */
+ case OOM_SCAN_CONTINUE:
continue;
-
- /*
- * This task already has access to memory reserves and is
- * being killed. Don't allow any other task access to the
- * memory reserve.
- *
- * Note: this may have a chance of deadlock if it gets
- * blocked waiting for another task which itself is waiting
- * for memory. Is there a better alternative?
- */
- if (test_tsk_thread_flag(p, TIF_MEMDIE))
+ case OOM_SCAN_ABORT:
+ rcu_read_unlock();
return ERR_PTR(-1UL);
-
- if (p->flags & PF_EXITING) {
- /*
- * If p is the current task and is in the process of
- * releasing memory, we allow the "kill" to set
- * TIF_MEMDIE, which will allow it to gain access to
- * memory reserves. Otherwise, it may stall forever.
- *
- * The loop isn't broken here, however, in case other
- * threads are found to have already been oom killed.
- */
- if (p == current) {
- chosen = p;
- *ppoints = 1000;
- } else {
- /*
- * If this task is not being ptraced on exit,
- * then wait for it to finish before killing
- * some other task unnecessarily.
- */
- if (!(task_ptrace(p->group_leader) &
- PT_TRACE_EXIT))
- return ERR_PTR(-1UL);
- }
- }
-
- points = oom_badness(p, mem, nodemask, totalpages);
- if (points > *ppoints) {
+ case OOM_SCAN_OK:
+ break;
+ };
+ points = oom_badness(p, NULL, nodemask, totalpages);
+ if (points > chosen_points) {
chosen = p;
- *ppoints = points;
+ chosen_points = points;
}
} while_each_thread(g, p);
+ if (chosen)
+ get_task_struct(chosen);
+ rcu_read_unlock();
+ *ppoints = chosen_points * 1000 / totalpages;
return chosen;
}
/**
* dump_tasks - dump current memory state of all system tasks
- * @mem: current's memory controller, if constrained
+ * @memcg: current's memory controller, if constrained
* @nodemask: nodemask passed to page allocator for mempolicy ooms
*
* Dumps the current memory state of all eligible tasks. Tasks not in the same
* memcg, not in the same cpuset, or bound to a disjoint set of mempolicy nodes
* are not shown.
- * State information includes task's pid, uid, tgid, vm size, rss, cpu, oom_adj
- * value, oom_score_adj value, and name.
- *
- * Call with tasklist_lock read-locked.
+ * State information includes task's pid, uid, tgid, vm size, rss, nr_ptes,
+ * swapents, oom_score_adj value, and name.
*/
-static void dump_tasks(const struct mem_cgroup *mem, const nodemask_t *nodemask)
+static void dump_tasks(const struct mem_cgroup *memcg, const nodemask_t *nodemask)
{
struct task_struct *p;
struct task_struct *task;
- pr_info("[ pid ] uid tgid total_vm rss cpu oom_adj oom_score_adj name\n");
+ pr_info("[ pid ] uid tgid total_vm rss nr_ptes swapents oom_score_adj name\n");
+ rcu_read_lock();
for_each_process(p) {
- if (oom_unkillable_task(p, mem, nodemask))
+ if (oom_unkillable_task(p, memcg, nodemask))
continue;
task = find_lock_task_mm(p);
continue;
}
- pr_info("[%5d] %5d %5d %8lu %8lu %3u %3d %5d %s\n",
- task->pid, task_uid(task), task->tgid,
- task->mm->total_vm, get_mm_rss(task->mm),
- task_cpu(task), task->signal->oom_adj,
+ pr_info("[%5d] %5d %5d %8lu %8lu %7lu %8lu %5hd %s\n",
+ task->pid, from_kuid(&init_user_ns, task_uid(task)),
+ task->tgid, task->mm->total_vm, get_mm_rss(task->mm),
+ task->mm->nr_ptes,
+ get_mm_counter(task->mm, MM_SWAPENTS),
task->signal->oom_score_adj, task->comm);
task_unlock(task);
}
+ rcu_read_unlock();
}
static void dump_header(struct task_struct *p, gfp_t gfp_mask, int order,
- struct mem_cgroup *mem, const nodemask_t *nodemask)
+ struct mem_cgroup *memcg, const nodemask_t *nodemask)
{
task_lock(current);
pr_warning("%s invoked oom-killer: gfp_mask=0x%x, order=%d, "
- "oom_adj=%d, oom_score_adj=%d\n",
- current->comm, gfp_mask, order, current->signal->oom_adj,
+ "oom_score_adj=%hd\n",
+ current->comm, gfp_mask, order,
current->signal->oom_score_adj);
cpuset_print_task_mems_allowed(current);
task_unlock(current);
dump_stack();
- mem_cgroup_print_oom_info(mem, p);
- show_mem(SHOW_MEM_FILTER_NODES);
+ if (memcg)
+ mem_cgroup_print_oom_info(memcg, p);
+ else
+ show_mem(SHOW_MEM_FILTER_NODES);
if (sysctl_oom_dump_tasks)
- dump_tasks(mem, nodemask);
+ dump_tasks(memcg, nodemask);
}
#define K(x) ((x) << (PAGE_SHIFT-10))
-static int oom_kill_task(struct task_struct *p, struct mem_cgroup *mem)
-{
- struct task_struct *q;
- struct mm_struct *mm;
-
- p = find_lock_task_mm(p);
- if (!p)
- return 1;
-
- /* mm cannot be safely dereferenced after task_unlock(p) */
- mm = p->mm;
-
- pr_err("Killed process %d (%s) total-vm:%lukB, anon-rss:%lukB, file-rss:%lukB\n",
- task_pid_nr(p), p->comm, K(p->mm->total_vm),
- K(get_mm_counter(p->mm, MM_ANONPAGES)),
- K(get_mm_counter(p->mm, MM_FILEPAGES)));
- task_unlock(p);
-
- /*
- * Kill all processes sharing p->mm in other thread groups, if any.
- * They don't get access to memory reserves or a higher scheduler
- * priority, though, to avoid depletion of all memory or task
- * starvation. This prevents mm->mmap_sem livelock when an oom killed
- * task cannot exit because it requires the semaphore and its contended
- * by another thread trying to allocate memory itself. That thread will
- * now get access to memory reserves since it has a pending fatal
- * signal.
- */
- for_each_process(q)
- if (q->mm == mm && !same_thread_group(q, p)) {
- task_lock(q); /* Protect ->comm from prctl() */
- pr_err("Kill process %d (%s) sharing same memory\n",
- task_pid_nr(q), q->comm);
- task_unlock(q);
- force_sig(SIGKILL, q);
- }
-
- set_tsk_thread_flag(p, TIF_MEMDIE);
- force_sig(SIGKILL, p);
-
- return 0;
-}
-#undef K
-
-static int oom_kill_process(struct task_struct *p, gfp_t gfp_mask, int order,
- unsigned int points, unsigned long totalpages,
- struct mem_cgroup *mem, nodemask_t *nodemask,
- const char *message)
+/*
+ * Must be called while holding a reference to p, which will be released upon
+ * returning.
+ */
+void oom_kill_process(struct task_struct *p, gfp_t gfp_mask, int order,
+ unsigned int points, unsigned long totalpages,
+ struct mem_cgroup *memcg, nodemask_t *nodemask,
+ const char *message)
{
struct task_struct *victim = p;
struct task_struct *child;
struct task_struct *t = p;
+ struct mm_struct *mm;
unsigned int victim_points = 0;
-
- if (printk_ratelimit())
- dump_header(p, gfp_mask, order, mem, nodemask);
+ static DEFINE_RATELIMIT_STATE(oom_rs, DEFAULT_RATELIMIT_INTERVAL,
+ DEFAULT_RATELIMIT_BURST);
/*
* If the task is already exiting, don't alarm the sysadmin or kill
*/
if (p->flags & PF_EXITING) {
set_tsk_thread_flag(p, TIF_MEMDIE);
- return 0;
+ put_task_struct(p);
+ return;
}
+ if (__ratelimit(&oom_rs))
+ dump_header(p, gfp_mask, order, memcg, nodemask);
+
task_lock(p);
pr_err("%s: Kill process %d (%s) score %d or sacrifice child\n",
message, task_pid_nr(p), p->comm, points);
/*
* If any of p's children has a different mm and is eligible for kill,
- * the one with the highest badness() score is sacrificed for its
+ * the one with the highest oom_badness() score is sacrificed for its
* parent. This attempts to lose the minimal amount of work done while
* still freeing memory.
*/
+ read_lock(&tasklist_lock);
do {
list_for_each_entry(child, &t->children, sibling) {
unsigned int child_points;
/*
* oom_badness() returns 0 if the thread is unkillable
*/
- child_points = oom_badness(child, mem, nodemask,
+ child_points = oom_badness(child, memcg, nodemask,
totalpages);
if (child_points > victim_points) {
+ put_task_struct(victim);
victim = child;
victim_points = child_points;
+ get_task_struct(victim);
}
}
} while_each_thread(p, t);
+ read_unlock(&tasklist_lock);
- return oom_kill_task(victim, mem);
+ rcu_read_lock();
+ p = find_lock_task_mm(victim);
+ if (!p) {
+ rcu_read_unlock();
+ put_task_struct(victim);
+ return;
+ } else if (victim != p) {
+ get_task_struct(p);
+ put_task_struct(victim);
+ victim = p;
+ }
+
+ /* mm cannot safely be dereferenced after task_unlock(victim) */
+ mm = victim->mm;
+ pr_err("Killed process %d (%s) total-vm:%lukB, anon-rss:%lukB, file-rss:%lukB\n",
+ task_pid_nr(victim), victim->comm, K(victim->mm->total_vm),
+ K(get_mm_counter(victim->mm, MM_ANONPAGES)),
+ K(get_mm_counter(victim->mm, MM_FILEPAGES)));
+ task_unlock(victim);
+
+ /*
+ * Kill all user processes sharing victim->mm in other thread groups, if
+ * any. They don't get access to memory reserves, though, to avoid
+ * depletion of all memory. This prevents mm->mmap_sem livelock when an
+ * oom killed thread cannot exit because it requires the semaphore and
+ * its contended by another thread trying to allocate memory itself.
+ * That thread will now get access to memory reserves since it has a
+ * pending fatal signal.
+ */
+ for_each_process(p)
+ if (p->mm == mm && !same_thread_group(p, victim) &&
+ !(p->flags & PF_KTHREAD)) {
+ if (p->signal->oom_score_adj == OOM_SCORE_ADJ_MIN)
+ continue;
+
+ task_lock(p); /* Protect ->comm from prctl() */
+ pr_err("Kill process %d (%s) sharing same memory\n",
+ task_pid_nr(p), p->comm);
+ task_unlock(p);
+ do_send_sig_info(SIGKILL, SEND_SIG_FORCED, p, true);
+ }
+ rcu_read_unlock();
+
+ set_tsk_thread_flag(victim, TIF_MEMDIE);
+ do_send_sig_info(SIGKILL, SEND_SIG_FORCED, victim, true);
+ put_task_struct(victim);
}
+#undef K
/*
* Determines whether the kernel must panic because of the panic_on_oom sysctl.
*/
-static void check_panic_on_oom(enum oom_constraint constraint, gfp_t gfp_mask,
- int order, const nodemask_t *nodemask)
+void check_panic_on_oom(enum oom_constraint constraint, gfp_t gfp_mask,
+ int order, const nodemask_t *nodemask)
{
if (likely(!sysctl_panic_on_oom))
return;
if (constraint != CONSTRAINT_NONE)
return;
}
- read_lock(&tasklist_lock);
dump_header(NULL, gfp_mask, order, NULL, nodemask);
- read_unlock(&tasklist_lock);
panic("Out of memory: %s panic_on_oom is enabled\n",
sysctl_panic_on_oom == 2 ? "compulsory" : "system-wide");
}
-#ifdef CONFIG_CGROUP_MEM_RES_CTLR
-void mem_cgroup_out_of_memory(struct mem_cgroup *mem, gfp_t gfp_mask)
-{
- unsigned long limit;
- unsigned int points = 0;
- struct task_struct *p;
-
- /*
- * If current has a pending SIGKILL, then automatically select it. The
- * goal is to allow it to allocate so that it may quickly exit and free
- * its memory.
- */
- if (fatal_signal_pending(current)) {
- set_thread_flag(TIF_MEMDIE);
- return;
- }
-
- check_panic_on_oom(CONSTRAINT_MEMCG, gfp_mask, 0, NULL);
- limit = mem_cgroup_get_limit(mem) >> PAGE_SHIFT;
- read_lock(&tasklist_lock);
-retry:
- p = select_bad_process(&points, limit, mem, NULL);
- if (!p || PTR_ERR(p) == -1UL)
- goto out;
-
- if (oom_kill_process(p, gfp_mask, 0, points, limit, mem, NULL,
- "Memory cgroup out of memory"))
- goto retry;
-out:
- read_unlock(&tasklist_lock);
-}
-#endif
-
static BLOCKING_NOTIFIER_HEAD(oom_notify_list);
int register_oom_notifier(struct notifier_block *nb)
spin_unlock(&zone_scan_lock);
}
-/*
- * Try to acquire the oom killer lock for all system zones. Returns zero if a
- * parallel oom killing is taking place, otherwise locks all zones and returns
- * non-zero.
- */
-static int try_set_system_oom(void)
-{
- struct zone *zone;
- int ret = 1;
-
- spin_lock(&zone_scan_lock);
- for_each_populated_zone(zone)
- if (zone_is_oom_locked(zone)) {
- ret = 0;
- goto out;
- }
- for_each_populated_zone(zone)
- zone_set_flag(zone, ZONE_OOM_LOCKED);
-out:
- spin_unlock(&zone_scan_lock);
- return ret;
-}
-
-/*
- * Clears ZONE_OOM_LOCKED for all system zones so that failed allocation
- * attempts or page faults may now recall the oom killer, if necessary.
- */
-static void clear_system_oom(void)
-{
- struct zone *zone;
-
- spin_lock(&zone_scan_lock);
- for_each_populated_zone(zone)
- zone_clear_flag(zone, ZONE_OOM_LOCKED);
- spin_unlock(&zone_scan_lock);
-}
-
/**
* out_of_memory - kill the "best" process when we run out of memory
* @zonelist: zonelist pointer
* @gfp_mask: memory allocation flags
* @order: amount of memory being requested as a power of 2
* @nodemask: nodemask passed to page allocator
+ * @force_kill: true if a task must be killed, even if others are exiting
*
* If we run out of memory, we have the choice between either
* killing a random task (bad), letting the system crash (worse)
* don't have to be perfect here, we just have to be good.
*/
void out_of_memory(struct zonelist *zonelist, gfp_t gfp_mask,
- int order, nodemask_t *nodemask)
+ int order, nodemask_t *nodemask, bool force_kill)
{
const nodemask_t *mpol_mask;
struct task_struct *p;
unsigned long totalpages;
unsigned long freed = 0;
- unsigned int points;
+ unsigned int uninitialized_var(points);
enum oom_constraint constraint = CONSTRAINT_NONE;
int killed = 0;
return;
/*
- * If current has a pending SIGKILL, then automatically select it. The
- * goal is to allow it to allocate so that it may quickly exit and free
- * its memory.
+ * If current has a pending SIGKILL or is exiting, then automatically
+ * select it. The goal is to allow it to allocate so that it may
+ * quickly exit and free its memory.
*/
- if (fatal_signal_pending(current)) {
+ if (fatal_signal_pending(current) || current->flags & PF_EXITING) {
set_thread_flag(TIF_MEMDIE);
return;
}
mpol_mask = (constraint == CONSTRAINT_MEMORY_POLICY) ? nodemask : NULL;
check_panic_on_oom(constraint, gfp_mask, order, mpol_mask);
- read_lock(&tasklist_lock);
- if (sysctl_oom_kill_allocating_task &&
+ if (sysctl_oom_kill_allocating_task && current->mm &&
!oom_unkillable_task(current, NULL, nodemask) &&
- current->mm && !atomic_read(¤t->mm->oom_disable_count)) {
- /*
- * oom_kill_process() needs tasklist_lock held. If it returns
- * non-zero, current could not be killed so we must fallback to
- * the tasklist scan.
- */
- if (!oom_kill_process(current, gfp_mask, order, 0, totalpages,
- NULL, nodemask,
- "Out of memory (oom_kill_allocating_task)"))
- goto out;
- }
-
-retry:
- p = select_bad_process(&points, totalpages, NULL, mpol_mask);
- if (PTR_ERR(p) == -1UL)
+ current->signal->oom_score_adj != OOM_SCORE_ADJ_MIN) {
+ get_task_struct(current);
+ oom_kill_process(current, gfp_mask, order, 0, totalpages, NULL,
+ nodemask,
+ "Out of memory (oom_kill_allocating_task)");
goto out;
+ }
+ p = select_bad_process(&points, totalpages, mpol_mask, force_kill);
/* Found nothing?!?! Either we hang forever, or we panic. */
if (!p) {
dump_header(NULL, gfp_mask, order, NULL, mpol_mask);
- read_unlock(&tasklist_lock);
panic("Out of memory and no killable processes...\n");
}
-
- if (oom_kill_process(p, gfp_mask, order, points, totalpages, NULL,
- nodemask, "Out of memory"))
- goto retry;
- killed = 1;
+ if (PTR_ERR(p) != -1UL) {
+ oom_kill_process(p, gfp_mask, order, points, totalpages, NULL,
+ nodemask, "Out of memory");
+ killed = 1;
+ }
out:
- read_unlock(&tasklist_lock);
-
/*
- * Give "p" a good chance of killing itself before we
- * retry to allocate memory unless "p" is current
+ * Give the killed threads a good chance of exiting before trying to
+ * allocate memory again.
*/
- if (killed && !test_thread_flag(TIF_MEMDIE))
- schedule_timeout_uninterruptible(1);
+ if (killed)
+ schedule_timeout_killable(1);
}
/*
* The pagefault handler calls here because it is out of memory, so kill a
- * memory-hogging task. If a populated zone has ZONE_OOM_LOCKED set, a parallel
- * oom killing is already in progress so do nothing. If a task is found with
- * TIF_MEMDIE set, it has been killed so do nothing and allow it to exit.
+ * memory-hogging task. If any populated zone has ZONE_OOM_LOCKED set, a
+ * parallel oom killing is already in progress so do nothing.
*/
void pagefault_out_of_memory(void)
{
- if (try_set_system_oom()) {
- out_of_memory(NULL, 0, 0, NULL);
- clear_system_oom();
+ struct zonelist *zonelist = node_zonelist(first_online_node,
+ GFP_KERNEL);
+
+ if (try_set_zonelist_oom(zonelist, GFP_KERNEL)) {
+ out_of_memory(NULL, 0, 0, NULL, false);
+ clear_zonelist_oom(zonelist, GFP_KERNEL);
}
- if (!test_thread_flag(TIF_MEMDIE))
- schedule_timeout_uninterruptible(1);
}
projects / firefly-linux-kernel-4.4.55.git / blobdiff