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Subject[PATCH 0/2] mm: hotplug: implement non-movable version of get_user_pages() to kill long-time pin pages
Currently get_user_pages() always tries to allocate pages from movable zone,
as discussed in thread, in some case users
of get_user_pages() is easy to pin user pages for a long time(for now we found
that pages pinned as aio ring pages is such case), which is fatal for memory
hotplug/remove framework.

So the 1st patch introduces a new library function called
get_user_pages_non_movable() to pin pages only from zone non-movable in memory.
It's a wrapper of get_user_pages() but it makes sure that all pages come from
non-movable zone via additional page migration.

The 2nd patch gets around the aio ring pages can't be migrated bug caused by
get_user_pages() via using the new function. It only works when configed with
CONFIG_MEMORY_HOTREMOVE, otherwise it uses the old version of get_user_pages().

Lin Feng (2):
mm: hotplug: implement non-movable version of get_user_pages()
fs/aio.c: use non-movable version of get_user_pages() to pin ring
pages when support memory hotremove

fs/aio.c | 6 +++++
include/linux/mm.h | 5 ++++
include/linux/mmzone.h | 4 ++++
mm/memory.c | 63 ++++++++++++++++++++++++++++++++++++++++++++++++++
mm/page_isolation.c | 5 ++++
5 files changed, 83 insertions(+)


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