On 07/31/2017 11:12 PM, Yang Zhang wrote: > On 2017/7/29 4:34, Nitesh Narayan Lal wrote: >> Hi, >> >> I am working on the guest page hinting support with Rik. >> As per my implementation when pages are freed, they are added to a >> cpu-local list. Once that list fills up, the pages need to be passed to >> the hypervisor. I am currently using a seqlock to ensure page allocation >> does not allocate pages while they are being freed by the hypervisor. >> This list is passed to the hypervisor using virtio_balloon >> infrastructure. As per the current flow virtqueue_add() requires a >> memory allocation, which leads to a deadlock condition. >> >> What should be the right way to get around this? >> >> Looking forward for the suggestions. >> > > Hi Nitesh, > > I am interesting on the idea. Could you give more details of the > background? What page hinting can help and what's the expected usage > model? > Hi Yang, Basically page hinting support will help in handing of free memory between the guest and the host rapidly and transparently. It will also enable the guest to reuse the memory again with the use of MADV_FREE on the host side. I will be sharing the first patch-set soon, please feel free to make any suggestion which you feel are required. -- Regards Nitesh
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