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authorDavid Rientjes <rientjes@google.com>2012-03-21 16:33:46 -0700
committerLinus Torvalds <torvalds@linux-foundation.org>2012-03-21 17:54:55 -0700
commit647f2bdf4a00dbcaa8964286501d68e7d2e6da93 (patch)
treea9efa94d4add977b4629b137de7f4d002eec56dd /mm/oom_kill.c
parent2a1c9b1fc0a0ea2e30cdeb69062647c5c5ae661f (diff)
downloadlinux-647f2bdf4a00dbcaa8964286501d68e7d2e6da93.tar.gz
mm, oom: fold oom_kill_task() into oom_kill_process()
oom_kill_task() has a single caller, so fold it into its parent function, oom_kill_process(). Slightly reduces the number of lines in the oom killer. Acked-by: KOSAKI Motohiro <kosaki.motohiro@jp.fujitsu.com> Reviewed-by: KAMEZAWA Hiroyuki <kamezawa.hiroyu@jp.fujitsu.com> Signed-off-by: David Rientjes <rientjes@google.com> Acked-by: Michal Hocko <mhocko@suse.cz> Signed-off-by: Andrew Morton <akpm@linux-foundation.org> Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
Diffstat (limited to 'mm/oom_kill.c')
-rw-r--r--mm/oom_kill.c85
1 files changed, 38 insertions, 47 deletions
diff --git a/mm/oom_kill.c b/mm/oom_kill.c
index a26695fe883..d402b2c1040 100644
--- a/mm/oom_kill.c
+++ b/mm/oom_kill.c
@@ -434,52 +434,6 @@ static void dump_header(struct task_struct *p, gfp_t gfp_mask, int order,
}
#define K(x) ((x) << (PAGE_SHIFT-10))
-static void oom_kill_task(struct task_struct *p)
-{
- struct task_struct *q;
- struct mm_struct *mm;
-
- p = find_lock_task_mm(p);
- if (!p)
- return;
-
- /* 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 user 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) &&
- !(q->flags & PF_KTHREAD)) {
- if (q->signal->oom_score_adj == OOM_SCORE_ADJ_MIN)
- continue;
-
- 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);
-}
-#undef K
-
static 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,
@@ -488,6 +442,7 @@ static void oom_kill_process(struct task_struct *p, gfp_t gfp_mask, int order,
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())
@@ -531,8 +486,44 @@ static void oom_kill_process(struct task_struct *p, gfp_t gfp_mask, int order,
}
} while_each_thread(p, t);
- oom_kill_task(victim);
+ victim = find_lock_task_mm(victim);
+ if (!victim)
+ return;
+
+ /* 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);
+ force_sig(SIGKILL, p);
+ }
+
+ set_tsk_thread_flag(victim, TIF_MEMDIE);
+ force_sig(SIGKILL, victim);
}
+#undef K
/*
* Determines whether the kernel must panic because of the panic_on_oom sysctl.