summaryrefslogtreecommitdiff
path: root/include/linux/vm_event_item.h
diff options
context:
space:
mode:
authorJohannes Weiner <hannes@cmpxchg.org>2020-06-03 16:02:27 -0700
committerLinus Torvalds <torvalds@linux-foundation.org>2020-06-03 20:09:48 -0700
commita0b5b4147fb34639ae7d0c25a823297834344061 (patch)
treeb5ce48685b7b7bbf69c5d80c353569c8f1b8119c /include/linux/vm_event_item.h
parentd9eb1ea2bf8734afd8ec7d995270437a7242f82b (diff)
mm: memcontrol: update page->mem_cgroup stability rules
The previous patches have simplified the access rules around page->mem_cgroup somewhat: 1. We never change page->mem_cgroup while the page is isolated by somebody else. This was by far the biggest exception to our rules and it didn't stop at lock_page() or lock_page_memcg(). 2. We charge pages before they get put into page tables now, so the somewhat fishy rule about "can be in page table as long as it's still locked" is now gone and boiled down to having an exclusive reference to the page. Document the new rules. Any of the following will stabilize the page->mem_cgroup association: - the page lock - LRU isolation - lock_page_memcg() - exclusive access to the page Signed-off-by: Johannes Weiner <hannes@cmpxchg.org> Signed-off-by: Andrew Morton <akpm@linux-foundation.org> Reviewed-by: Alex Shi <alex.shi@linux.alibaba.com> Reviewed-by: Joonsoo Kim <iamjoonsoo.kim@lge.com> Cc: Hugh Dickins <hughd@google.com> Cc: "Kirill A. Shutemov" <kirill@shutemov.name> Cc: Michal Hocko <mhocko@suse.com> Cc: Roman Gushchin <guro@fb.com> Cc: Shakeel Butt <shakeelb@google.com> Cc: Balbir Singh <bsingharora@gmail.com> Link: http://lkml.kernel.org/r/20200508183105.225460-20-hannes@cmpxchg.org Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
Diffstat (limited to 'include/linux/vm_event_item.h')
0 files changed, 0 insertions, 0 deletions