请教下还有优化空间吗

我的一个用go写的web服务导致负载比较高，以下是pprof的一些信息，想请问下，像这些调用从代码角度还有可以优化的空间吗？

补充说明下：是一个计数的服务，存在一个全局map里，几乎没有其他操作

(pprof) top10
9010ms of 17440ms total (51.66%)
Dropped 310 nodes (cum <= 87.20ms)
Showing top 10 nodes out of 185 (cum >= 230ms)
      flat  flat%   sum%        cum   cum%
    5240ms 30.05% 30.05%     5330ms 30.56%  syscall.Syscall
     820ms  4.70% 34.75%      970ms  5.56%  syscall.Syscall6
     580ms  3.33% 38.07%      580ms  3.33%  runtime.epollctl
     470ms  2.69% 40.77%     1050ms  6.02%  runtime.pcvalue
     430ms  2.47% 43.23%      430ms  2.47%  runtime._ExternalCode
     420ms  2.41% 45.64%     1350ms  7.74%  runtime.mallocgc
     300ms  1.72% 47.36%      300ms  1.72%  runtime.readvarint
     280ms  1.61% 48.97%     2090ms 11.98%  runtime.gentraceback
     240ms  1.38% 50.34%     1040ms  5.96%  runtime.adjustframe
     230ms  1.32% 51.66%      230ms  1.32%  runtime.adjustpointers