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Collection of memory_pressure can be enabled by writing 1 to the cpuset file 'memory_pressure_enabled', which is only for cpuset-v1. Therefore, move the corresponding code to cpuset-v1.c. Currently, the 'fmeter_init' and 'fmeter_getrate' functions are called at cpuset.c, so expose them to cpuset.c. Signed-off-by: Chen Ridong <chenridong@huawei.com> Acked-by: Waiman Long <longman@redhat.com> Signed-off-by: Tejun Heo <tj@kernel.org>