FlowEntry child list should have a bounded length - #1043
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LGTM. Just one non blocking note on observability.
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This was not the cause of our performance woes relating to flow expiry, but I think that it's a strong belt-and-braces property worth enforcing all of the time anyhow.
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LFT
FlowEntryelements track a list of all their children. These are our UFT and TCP flow entries -- if we evict an LFT entry, then the child entries can no longer be used. We also use these lists to determine whether an LFT entry can be evicted using the active TCP flow state information, if present.We know that this set should be bounded, so this PR makes this into a hard requirement to cap the amount of time we can spend computing any one flow's eviction score. This was not the cause of our performance woes relating to flow expiry, but I think that it's a strong belt-and-braces property worth enforcing all of the time.