On 10/02/2012 04:25 PM, Yasuaki Ishimatsu wrote: > We are trying to implement a physical memory hot removing function as > following thread. > > https://lkml.org/lkml/2012/9/5/201 > > But there is not enough review to merge into linux kernel. > > I think there are following blockades. > 1. no physical memory hot removable system > 2. huge patch-set > > If you have a KVM system, we can get rid of 1st blockade. Because > applying following patch, we can create memory hot removable system > on KVM guest. > > http://lists.gnu.org/archive/html/qemu-devel/2012-07/msg01389.html > > 2nd blockade is own problem. So we try to divide huge patch into > a small patch in each function as follows: > > - bug fix > - acpi framework > - kernel core > > We had already sent bug fix patches. > > https://lkml.org/lkml/2012/9/27/39 > > And the patch fixes following bug. > > remove_memory() offlines memory. And it is called by following two cases: > > 1. echo offline >/sys/devices/system/memory/memoryXX/state > 2. hot remove a memory device > > In the 1st case, the memory block's state is changed and the notification > that memory block's state changed is sent to userland after calling > offline_memory(). So user can notice memory block is changed., Hi Yasuaki, Thanks for splitting the patchset, it's more easier to review this time. One question: How can notify userspace? you mean function node_memory_callback or ...., but this function basically do nothing. > > But in the 2nd case, the memory block's state is not changed and the > notification is not also sent to userspcae even if calling offline_memory(). > So user cannot notice memory block is changed. > > We should also notify to userspace at 2nd case. > > -- > To unsubscribe, send a message with 'unsubscribe linux-mm' in > the body to majordomo@xxxxxxxxx. For more info on Linux MM, > see: http://www.linux-mm.org/ . > Don't email: <a href=mailto:"dont@xxxxxxxxx";> email@xxxxxxxxx </a> > -- To unsubscribe, send a message with 'unsubscribe linux-mm' in the body to majordomo@xxxxxxxxx. For more info on Linux MM, see: http://www.linux-mm.org/ . Don't email: <a href=mailto:"dont@xxxxxxxxx";> email@xxxxxxxxx </a>