X-Git-Url: https://git.karo-electronics.de/?a=blobdiff_plain;f=mm%2Foom_kill.c;h=223d9ccb7d64b6b28f5642ba3ab12629a170419a;hb=acc9252a36dcefbcdae12f88566300a80d925e11;hp=20f41b082e16484a8c52aa04272bf4f30359593c;hpb=5a3e3b2230980cf2ce6e5e56b816dde19b993939;p=karo-tx-linux.git

diff --git a/mm/oom_kill.c b/mm/oom_kill.c
index 20f41b082e16..223d9ccb7d64 100644
--- a/mm/oom_kill.c
+++ b/mm/oom_kill.c
@@ -15,6 +15,7 @@
  *  kernel subsystems and hints as to where to find out what things do.
  */
 
+#include <linux/oom.h>
 #include <linux/mm.h>
 #include <linux/sched.h>
 #include <linux/swap.h>
@@ -263,7 +264,7 @@ 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);
@@ -277,10 +278,8 @@ 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
@@ -293,7 +292,7 @@ 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;
@@ -312,15 +311,25 @@ 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;
 }
@@ -336,21 +345,22 @@ 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);