mm/damon/core: skip apply schemes if empty
Sometimes there is no scheme in damon's context, for example just use damo record to monitor workload's data access pattern. If current damon context doesn't have any scheme in the list, kdamond has no need to iterate over list of all targets and regions but do nothing. So, skip apply schemes when ctx->schemes is empty. Link: https://lkml.kernel.org/r/20230116062347.1148553-1-huaisheng.ye@intel.comSigned-off-by: Huaisheng Ye <huaisheng.ye@intel.com> Reviewed-by: SeongJae Park <sj@kernel.org> Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
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