Commits on Nov 21, 2023

1. [prototype] Make apiserver admission plugins retrieve k8s objects dir… …

   …ectly from its storage
   
   Before this commit, admission plugins use informers to sync k8s objects and as
   a result, there is a copy of k8s object in kube-apiserver. This commit allows
   referencing k8s objects from storage without actually copying them, which
   reduces significant memory usage in both serving and storage.
   
   Also observed a visible amount of CPU usage reduced in kube-apiserver
   startup as the admission plugins didn't need to fetch objects from the
   HTTP endpoints, nor did kube-apiserver need to serve.
   
   Memory measurements and comparisons
   
   ```
   kubectl get --raw /metrics | grep go_memstats_alloc_bytes
   ```
   
   Origin:
   
   Peak memory alloc: go_memstats_alloc_bytes 7.16614552e+08
   Stablized memory alloc: go_memstats_alloc_bytes 4.2804752e+08
   
   Optimized:
   
   Peak memory alloc: go_memstats_alloc_bytes 3.46012872e+08
   Stablized memory alloc: go_memstats_alloc_bytes 2.82520896e+08

   

   linxiulei committed Nov 21, 2023
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