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Automatic merge from submit-queue (batch tested with PRs 45534, 37212, 46613, 46350) Speed up and reduce number of memory allocations in kube-proxy This is a second (and last PR) in this series - this solves all very-low-hanging fruits. This PR: - reduces cpu usage by ~25% - reduces memory allocations by ~3x (together with #46033 by 10-12x) Without this PR: ``` (pprof) top 8.59GB of 8.79GB total (97.75%) Dropped 238 nodes (cum <= 0.04GB) Showing top 10 nodes out of 64 (cum >= 0.11GB) flat flat% sum% cum cum% 3.66GB 41.60% 41.60% 8.72GB 99.17% k8s.io/kubernetes/pkg/proxy/iptables.(*Proxier).syncProxyRules 3.07GB 34.96% 76.56% 3.07GB 34.96% runtime.rawstringtmp 0.62GB 7.09% 83.65% 0.62GB 7.09% runtime.hashGrow 0.34GB 3.82% 87.46% 0.34GB 3.82% runtime.stringtoslicebyte 0.29GB 3.24% 90.71% 0.58GB 6.61% encoding/base32.(*Encoding).EncodeToString 0.22GB 2.47% 93.18% 0.22GB 2.47% strings.genSplit 0.18GB 2.04% 95.22% 0.18GB 2.04% runtime.convT2E 0.11GB 1.22% 96.44% 0.73GB 8.36% runtime.mapassign 0.10GB 1.08% 97.52% 0.10GB 1.08% syscall.ByteSliceFromString 0.02GB 0.23% 97.75% 0.11GB 1.25% syscall.SlicePtrFromStrings ``` with this PR: ``` (pprof) top 2.98GB of 3.08GB total (96.78%) Dropped 246 nodes (cum <= 0.02GB) Showing top 10 nodes out of 70 (cum >= 0.10GB) flat flat% sum% cum cum% 1.99GB 64.60% 64.60% 1.99GB 64.60% runtime.rawstringtmp 0.58GB 18.95% 83.55% 0.58GB 18.95% runtime.hashGrow 0.10GB 3.40% 86.95% 0.69GB 22.47% runtime.mapassign 0.09GB 2.86% 89.80% 0.09GB 2.86% syscall.ByteSliceFromString 0.08GB 2.63% 92.44% 0.08GB 2.63% runtime.convT2E 0.03GB 1.13% 93.56% 0.03GB 1.13% syscall.Environ 0.03GB 0.99% 94.56% 0.03GB 0.99% bytes.makeSlice 0.03GB 0.97% 95.52% 0.03GB 1.06% os.Stat 0.02GB 0.65% 96.18% 3.01GB 97.79% k8s.io/kubernetes/pkg/proxy/iptables.(*Proxier).syncProxyRules 0.02GB 0.6% 96.78% 0.10GB 3.35% syscall.SlicePtrFromStrings ```