Set stack to cache since BPF_F_REUSE_STACKID is not set by default
#14
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The reason for not setting the stack in the cache was concern over the same stack id being reused.
I just didn't know how BPF_F_REUSE_STACKID works.
Since BPF_F_REUSE_STACKID is unset by default, we can set stack to the cache.