On Sat, Mar 20, 2021 at 09:32:49AM -0700, Andrew Morton wrote: > On Fri, 19 Mar 2021 10:51:27 -0700 Minchan Kim <minchan@xxxxxxxxxx> wrote: > > > Pages containing buffer_heads that are in one of the per-CPU > > buffer_head LRU caches will be pinned and thus cannot be migrated. > > This can prevent CMA allocations from succeeding, which are often used > > on platforms with co-processors (such as a DSP) that can only use > > physically contiguous memory. It can also prevent memory > > hot-unplugging from succeeding, which involves migrating at least > > MIN_MEMORY_BLOCK_SIZE bytes of memory, which ranges from 8 MiB to 1 > > GiB based on the architecture in use. > > > > Correspondingly, invalidate the BH LRU caches before a migration > > starts and stop any buffer_head from being cached in the LRU caches, > > until migration has finished. > > > > Tested-by: Oliver Sang <oliver.sang@xxxxxxxxx> > > Reported-by: kernel test robot <oliver.sang@xxxxxxxxx> > > Signed-off-by: Chris Goldsworthy <cgoldswo@xxxxxxxxxxxxxx> > > Signed-off-by: Minchan Kim <minchan@xxxxxxxxxx> > > The signoff chain ordering might mean that Chris was the primary author, but > there is no From:him. Please clarify? He tried first version but was diffrent implementation since I changed a lot. That's why I added his SoB even though current implementaion is much different. So, maybe I am primary author?
