Yasunori Goto <y-g...@jp.fujitsu.com> writes:

> Hi,
>
>> >   Another approach could be to integrate NVDIMM event
>> > monitoring into some other utility, like the rasdaemon.  I'm interested in
>> > your thoughts.
>> 
>> Though I'm not sure which (existing or new) utility is appropriate yet.
>> I prefer this way. So, I'll think about it.
>
> I investigated the issue that notification/monitoring feature of over-
> threshold event with my co-worker. Here is current our understandings.
>
>
> a) rasdaemon
>   It is good tools for machine check error, and if machine check occurs on
>   NVDIMM, I suppose it will work not only traditional RAM but also NVDIMM.
>   But, it may not fit the purpose of notification/monitoring threshold event.
>
>
> b) smartmontools (https://www.smartmontools.org/)
>   This tool may fit the purpose of notification/monitoring of health of 
> NVDIMMs.
>   However, it may a bit troublesome due to the followings.
>
>     - The smartd seems to check smart values of each devices with
>       ioctl() periodically (In other words, "polling"). 
>       Probably, other devices does not have the
>       notification interface like "ndctl_dimm_get_health_eventfd()
>       and poll()/select()".
>       
>     - smartmontools supports many OSs (Windows, darwin, xxxBSDs, os2(!)).
>       I'm not sure other OSs have similar notification interface like Linux.
>       So, it may need to "polling" like other devices.
>
> c) udev
>    Udev can kick any programs if udev.rules is created.
>    However, there is no uevent for the event of over-threshold currently.
>    In addition, I'm not sure that udev fits this type of event notification.
>
>
> d) make a new tiny daemon in ndctl tree
>    This may be simpler way. 
>    It can use ndctl_dimm_get_health_eventfd() and poll()/select().
>     
>    But, ndctl may be included in kernel source,
>    and I don't know whether kernel includes other daemon tools or not.

e) acpid

-Jeff
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