lkml.org 
[lkml]   [2013]   [Feb]   [4]   [last100]   RSS Feed
Views: [wrap][no wrap]   [headers]  [forward] 
 
Messages in this thread
/
From
Subject[PATCH 0/2] mm: hotplug: implement non-movable version of get_user_pages() to kill long-time pin pages
Date
Currently get_user_pages() always tries to allocate pages from movable zone,
as discussed in thread https://lkml.org/lkml/2012/11/29/69, 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(+)

--
1.7.11.7



\
 
 \ /
  Last update: 2013-02-04 11:45    [W:0.207 / U:2.296 seconds]
©2003-2020 Jasper Spaans|hosted at Digital Ocean and TransIP|Read the blog|Advertise on this site