On Tue, 16 Oct 2012, Glauber Costa wrote: > When a process tries to allocate a page with the __GFP_KMEMCG flag, the > page allocator will call the corresponding memcg functions to validate > the allocation. Tasks in the root memcg can always proceed. > > To avoid adding markers to the page - and a kmem flag that would > necessarily follow, as much as doing page_cgroup lookups for no reason, > whoever is marking its allocations with __GFP_KMEMCG flag is responsible > for telling the page allocator that this is such an allocation at > free_pages() time. This is done by the invocation of > __free_accounted_pages() and free_accounted_pages(). > > [ v2: inverted test order to avoid a memcg_get leak, > free_accounted_pages simplification ] > [ v4: test for TIF_MEMDIE at newpage_charge ] > > Signed-off-by: Glauber Costa <glommer@xxxxxxxxxxxxx> > Acked-by: Michal Hocko <mhocko@xxxxxxx> > Acked-by: Mel Gorman <mgorman@xxxxxxx> > Acked-by: Kamezawa Hiroyuki <kamezawa.hiroyu@xxxxxxxxxxxxxx> > CC: Christoph Lameter <cl@xxxxxxxxx> > CC: Pekka Enberg <penberg@xxxxxxxxxxxxxx> > CC: Johannes Weiner <hannes@xxxxxxxxxxx> > CC: Suleiman Souhlal <suleiman@xxxxxxxxxx> > CC: Tejun Heo <tj@xxxxxxxxxx> Acked-by: David Rientjes <rientjes@xxxxxxxxxx> -- To unsubscribe, send a message with 'unsubscribe linux-mm' in the body to majordomo@xxxxxxxxx. For more info on Linux MM, see: http://www.linux-mm.org/ . Don't email: <a href=mailto:"dont@xxxxxxxxx";> email@xxxxxxxxx </a>