On Thu, Sep 12, 2013 at 11:10 AM, <gottl...@nyu.edu> wrote:
> On Thu, Sep 12 2013, Stefan G. Weichinger wrote:
>
>> Am 12.09.2013 08:50, schrieb Mick:
>>> On Wednesday 11 Sep 2013 12:38:23 Stefan G. Weichinger wrote:
>>>> Am 11.09.2013 13:22, schrieb Stefan G. Weichinger:
>>>>> Failed to set a proper state for notification semaphore
>>>>> identified by cookie value
>>>>
>>>> Also found this:
>>>>
>>>> http://forums.gentoo.org/viewtopic-t-965446-view-previous.html?sid=5c1f845f
>>>>
>>>>
>> 96ca4cf1a9c17d73501e232d
>>>>
>>>> I have
>>>>
>>>> # zgrep UEV /proc/config.gz CONFIG_UEVENT_HELPER_PATH=""
>>>> CONFIG_DM_UEVENT=y
>>>>
>>>> so this is not my solution here ...
>>>
>>> I wonder if adding CONFIG_UEVENT_HELPER_PATH="/sbin/hotplug" would
>>> help you here.
>>
>> I don't have that binary. And some page on my way said the contrary:
>> set it to empty and let udev (?) do that.
>
> The wiki says to have it blank. I just started working with the
> systemd-wiki people and this is unsettled. Some are using
> /sbin/hotplug. I believe there is not much experience to go on.
> I will be trying to go to systemd with /sbin/hotplug.
Do you even have /sbin/hotplug? I don't, in any of my machines, and I
don't even remember when was the last time I saw it.
>From the git live systemd README [1]:
Legacy hotplug slows down the system and confuses udev:
CONFIG_UEVENT_HELPER_PATH=""
>From the kernel own help file:
config UEVENT_HELPER_PATH
string "path to uevent helper"
default ""
help
Path to uevent helper program forked by the kernel for
every uevent.
Before the switch to the netlink-based uevent source, this was
used to hook hotplug scripts into kernel device events. It
usually pointed to a shell script at /sbin/hotplug.
This should not be used today, because usual systems create
many events at bootup or device discovery in a very short time
frame. One forked process per event can create so many processes
that it creates a high system load, or on smaller systems
it is known to create out-of-memory situations during bootup.
To disable user space helper program execution at early boot
time specify an empty string here. This setting can be altered
via /proc/sys/kernel/hotplug or via /sys/kernel/uevent_helper
later at runtime.
Really, whomever is recommending to set CONFIG_UEVENT_HELPER_PATH is
probably wrong. I can't find *one* place where it is recommended, and
several where they explicitly say to leave the option in blank.
Regards.
[1] http://cgit.freedesktop.org/systemd/systemd/tree/README
--
Canek Peláez Valdés
Posgrado en Ciencia e Ingeniería de la Computación
Universidad Nacional Autónoma de México
