Fix kevent's childs priority greediness
Jan Engelhardt [Tue, 8 May 2007 07:28:24 +0000 (00:28 -0700)]
Fix kevent's childs priority greediness.  Such tasks were always scheduled
at nice level -5 and, at that time, udev stole us the CPU time with -5.

Already posted at http://lkml.org/lkml/2005/1/10/85

[akpm@linux-foundation.org: add comment]
Signed-off-by: Jan Engelhardt <jengelh@gmx.de>
Cc: Chris Wright <chrisw@sous-sol.org>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>

kernel/kmod.c

index 11c584c..49cc4b9 100644 (file)
@@ -165,6 +165,12 @@ static int ____call_usermodehelper(void *data)
        /* We can run anywhere, unlike our parent keventd(). */
        set_cpus_allowed(current, CPU_MASK_ALL);
 
+       /*
+        * Our parent is keventd, which runs with elevated scheduling priority.
+        * Avoid propagating that into the userspace child.
+        */
+       set_user_nice(current, 0);
+
        retval = -EPERM;
        if (current->fs->root)
                retval = kernel_execve(sub_info->path,