diff options
authorArjan van de Ven <arjan@linux.intel.com>2009-03-19 09:09:05 -0700
committerGreg Kroah-Hartman <gregkh@suse.de>2009-03-24 16:38:26 -0700
commitf520360d93cdc37de5d972dac4bf3bdef6a7f6a7 (patch)
parent669420644c79c207f83fdf9105ae782867e2991f (diff)
kobject: don't block for each kobject_uevent
Right now, the kobject_uevent code blocks for each uevent that's being generated, due to using (for hystoric reasons) UHM_WAIT_EXEC as flag to call_usermode_helper(). Specifically, the effect is that each uevent that is being sent causes the code to wake up keventd, then block until keventd has processed the work. Needless to say, this happens many times during the system boot. This patches changes that to UHN_NO_WAIT (brilliant name for a constant btw) so that we only schedule the work to fire the uevent message, but do not wait for keventd to process the work. This removes one of the bottlenecks during boot; each one of them is only a small effect, but the sum of them does add up. [Note, distros that need this are broken, they should be setting CONFIG_UEVENT_HELPER_PATH to "", that way this code path will never be excuted at all -- gregkh] Signed-off-by: Arjan van de Ven <arjan@linux.intel.com> Signed-off-by: Greg Kroah-Hartman <gregkh@suse.de>
1 files changed, 1 insertions, 1 deletions
diff --git a/lib/kobject_uevent.c b/lib/kobject_uevent.c
index b2181cc8e4d..e68e743bd86 100644
--- a/lib/kobject_uevent.c
+++ b/lib/kobject_uevent.c
@@ -255,7 +255,7 @@ int kobject_uevent_env(struct kobject *kobj, enum kobject_action action,
goto exit;
retval = call_usermodehelper(argv[0], argv,
- env->envp, UMH_WAIT_EXEC);
+ env->envp, UMH_NO_WAIT);