On Mon 26-06-17 14:26:57, Joey Lee wrote: > Hi all, > > If ACPI received ejection request for a ACPI container, kernel > emits KOBJ_CHANGE uevent when it found online children devices > below the acpi container. > > Base on the description of caa73ea15 kernel patch, user space > is expected to offline all devices below the container and the > container itself. Then, user space can finalize the removal of > the container with the help of its ACPI device object's eject > attribute in sysfs. > > That means that kernel relies on users space to peform the offline > and ejection jobs to acpi container and children devices. The > discussion is here: > https://lkml.org/lkml/2013/11/28/520 > > The mail loop didn't explain why the userspace is responsible for > the whole container offlining. Is it possible to do that transparently > from the kernel? What's the difference between offlining memory and > processors which happends without any cleanup and container which > does essentially the same except it happens at once? > > - After a couple of years, can we let the container hot-remove > process transparently? > - Except udev rule, does there have any other mechanism to trigger > auto offline/ejection?
I would be also interested whether the kernel can simply send an udev event to all devices in the container. -- Michal Hocko SUSE Labs
