LU-502 don't allow to kill service threads by OOM killer.

[fs/lustre-release.git] / libcfs / libcfs / linux / linux-lwt.c

diff --git a/libcfs/libcfs/linux/linux-lwt.c b/libcfs/libcfs/linux/linux-lwt.c
index faf378f..a69b4e3 100644 (file)
--- a/libcfs/libcfs/linux/linux-lwt.c
+++ b/libcfs/libcfs/linux/linux-lwt.c
@@ -35,3 +35,48 @@
  */
 
 # define DEBUG_SUBSYSTEM S_LNET
+#include <linux/module.h>
+#include <linux/sched.h>
+#include <linux/spinlock.h>
+
+#ifdef HAVE_LINUX_OOM_H
+#include <linux/oom.h>
+#else
+#include <linux/mm.h>
+#endif
+
+int oom_get_adj(struct task_struct *task, int scope)
+{
+
+        int oom_adj;
+#ifdef HAVE_OOMADJ_IN_SIG
+        unsigned long flags;
+
+        spin_lock_irqsave(&task->sighand->siglock, flags);
+        oom_adj = task->signal->oom_adj;
+        task->signal->oom_adj = scope;
+        spin_unlock_irqrestore(&task->sighand->siglock, flags);
+
+#else
+        oom_adj = task->oomkilladj;
+        task->oomkilladj = scope;
+#endif
+        return oom_adj;
+}
+
+int cfs_create_thread(int (*fn)(void *),
+                      void *arg, unsigned long flags)
+{
+        void *orig_info = current->journal_info;
+        int rc;
+        int old_oom;
+
+        old_oom = oom_get_adj(current, OOM_DISABLE);
+        current->journal_info = NULL;
+        rc = kernel_thread(fn, arg, flags);
+        current->journal_info = orig_info;
+        oom_get_adj(current, old_oom);
+
+        return rc;
+}
+EXPORT_SYMBOL(cfs_create_thread);