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0b8f73e104
The creation and teardown of struct mem_cgroup is fairly messy and that has attracted mistakes and subtle bugs before. The main cause for this is that there is no clear model about what needs to happen when, and that attracts more chaos. So create one: 1. mem_cgroup_alloc() should allocate struct mem_cgroup and its auxiliary members and initialize work items, locks etc. so that the object it returns is fully initialized and in a neutral state. 2. mem_cgroup_css_alloc() will use mem_cgroup_alloc() to obtain a new memcg object and configure it and the system according to the role of the new memory-controlled cgroup in the hierarchy. 3. mem_cgroup_css_online() is no longer needed to synchronize with iterators, but it verifies css->id which isn't available earlier. 4. mem_cgroup_css_offline() implements stuff that needs to happen upon the user-visible destruction of a cgroup, which includes stopping all user interfacing as well as releasing certain structures when continued memory consumption would be unexpected at that point. 5. mem_cgroup_css_free() prepares the system and the memcg object for the object's disappearance, neutralizes its state, and then gives it back to mem_cgroup_free(). 6. mem_cgroup_free() releases struct mem_cgroup and auxiliary memory. [arnd@arndb.de: fix SLOB build regression] Signed-off-by: Johannes Weiner <hannes@cmpxchg.org> Acked-by: Vladimir Davydov <vdavydov@virtuozzo.com> Cc: Michal Hocko <mhocko@suse.cz> Signed-off-by: Arnd Bergmann <arnd@arndb.de> Signed-off-by: Andrew Morton <akpm@linux-foundation.org> Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org> |
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