kubernetes

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Kubernetes Submit Queue 0f95f13dcc Merge pull request #46350 from wojtek-t/reduce_kube_proxy_allocations_2

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
```

2017-05-30 04:46:06 -07:00