On 07.05.20 12:46, Michael S. Tsirkin wrote: > On Thu, May 07, 2020 at 12:31:11PM +0200, David Hildenbrand wrote: >> virtio-mem wants to offline and remove a memory block once it unplugged >> all subblocks (e.g., using alloc_contig_range()). Let's provide >> an interface to do that from a driver. virtio-mem already supports to >> offline partially unplugged memory blocks. Offlining a fully unplugged >> memory block will not require to migrate any pages. All unplugged >> subblocks are PageOffline() and have a reference count of 0 - so >> offlining code will simply skip them. >> >> All we need is an interface to offline and remove the memory from kernel >> module context, where we don't have access to the memory block devices >> (esp. find_memory_block() and device_offline()) and the device hotplug >> lock. >> >> To keep things simple, allow to only work on a single memory block. >> >> Acked-by: Michal Hocko <[email protected]> >> Tested-by: Pankaj Gupta <[email protected]> >> Cc: Andrew Morton <[email protected]> >> Cc: David Hildenbrand <[email protected]> >> Cc: Oscar Salvador <[email protected]> >> Cc: Michal Hocko <[email protected]> >> Cc: Pavel Tatashin <[email protected]> >> Cc: Wei Yang <[email protected]> >> Cc: Dan Williams <[email protected]> >> Cc: Qian Cai <[email protected]> >> Signed-off-by: David Hildenbrand <[email protected]> > > > didn't you lose Andrew Morton's ack here?
Yeah, thanks for noticing. > >> --- >> include/linux/memory_hotplug.h | 1 + >> mm/memory_hotplug.c | 37 ++++++++++++++++++++++++++++++++++ >> 2 files changed, 38 insertions(+) > > I get: > > error: sha1 information is lacking or useless (mm/memory_hotplug.c). > error: could not build fake ancestor > > which version is this against? Pls post patches on top of some tag > in Linus' tree if possible. As the cover states, latest linux-next. To be precise commit 6b43f715b6379433e8eb30aa9bcc99bd6a585f77 (tag: next-20200507, next/master) Author: Stephen Rothwell <[email protected]> Date: Thu May 7 18:11:31 2020 +1000 Add linux-next specific files for 20200507 -- Thanks, David / dhildenb _______________________________________________ Virtualization mailing list [email protected] https://lists.linuxfoundation.org/mailman/listinfo/virtualization
