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由 Luyao Huang 提交于
Just refactor existing code to use a child buf instead of check all element before format <blkiotune> and <cputune>. This will avoid the more and more bigger element check during we introduce new elements in <blkiotune> and <cputune> in the future. Signed-off-by: NLuyao Huang <lhuang@redhat.com>
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