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Describe what this PR does / why we need it
修复内存压力场景模式为cache不生效的问题
Does this pull request fix one issue?
fix issue #926
Describe how you did it
实验执行时挂载tmpfs到 {chaos os bin path}/burnmem_tmpfs 目录
实验销毁时umount该目录,并且删除burnmem_tmpfs 目录
Describe how to verify it
在Host和容器模式下均验证通过
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