On Mon, Jul 23, 2018 at 04:44:49PM +0800, Xiao Guangrong wrote:
[...]
However, it is not safe to do ram_release_pages in the thread as it's
not protected it multithreads. Fortunately, compression will be disabled
if it switches to post-copy, so i preferred to keep current behavior and
deferred to fix it after this patchset has been merged.
Do you mean ram_release_pages() is not thread-safe? Why? I didn't
notice it before but I feel like it is safe.
bitmap_clear() called in the function is not safe.
Yeah, and the funny thing is that I don't think ram_release_pages()
should even touch the receivedmap... It's possible that the
release-ram feature for postcopy is broken.
Never mind on that. I'll post a patch to fix it, then I think the
ram_release_pages() will be thread safe.
Then this patch shouldn't be affected and it should be fine after that
fix