Messages in this thread | | | Date | Wed, 20 Aug 2008 18:53:06 +0900 | From | KAMEZAWA Hiroyuki <> | Subject | [RFC][PATCH -mm 0/7] memcg: lockless page_cgroup v1 |
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Hi, this is a patch set for lockless page_cgroup.
dropped patches related to mem+swap controller for easy review. (I'm rewriting it, too.)
Changes from current -mm is. - page_cgroup->flags operations is set to be atomic. - lock_page_cgroup() is removed. - page->page_cgroup is changed from unsigned long to struct page_cgroup* - page_cgroup is freed by RCU. - For avoiding race, charge/uncharge against mm/memory.c::insert_page() is omitted. This is ususally used for mapping device's page. (I think...)
In my quick test, perfomance is improved a little. But the benefit of this patch is to allow access page_cgroup without lock. I think this is good for Yamamoto's Dirty page tracking for memcg. For I/O tracking people, I added a header file for allowing access to page_cgroup from out of memcontrol.c
The base kernel is recent mmtom. Any comments are welcome. This is still under test. I have to do long-run test before removing "RFC".
patch [1-4] is core logic.
[1/7] page_cgroup_atomic_flags.patch [2/7] delayed_batch_freeing_of_page_cgroup.patch [3/7] freeing page_cgroup by rcu.patch [4/7] lockess page_cgroup.patch [5/7] add prefetch patch [6/7] make-mapping-null-before-calling-uncharge.patch [7/7] adding page_cgroup.h header file.patch
Thanks, -Kame
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