add poweroff command

hc

2023-12-14 982b8cc116118b3463d3f332581945625722acd8

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#!/bin/bash
perf record -e compaction:mm_compaction_begin -e compaction:mm_compaction_end -e compaction:mm_compaction_migratepages -e compaction:mm_compaction_isolate_migratepages -e compaction:mm_compaction_isolate_freepages $@