golang gc 这种情况是否是需要优化内存？

Time: Jan 13, 2018 at 11:14am (CST) Duration: 30.11s, Total samples = 12.17s (40.41%) Entering interactive mode (type "help" for commands, "o" for options) (pprof) top Showing nodes accounting for 6170ms, 50.70% of 12170ms total Dropped 281 nodes (cum <= 60.85ms) Showing top 10 nodes out of 170 flat flat% sum% cum cum% 1370ms 11.26% 11.26% 1370ms 11.26% runtime.futex /usr/local/go/src/runtime/sys_linux_amd64.s 1310ms 10.76% 22.02% 2960ms 24.32% runtime.scanobject /usr/local/go/src/runtime/mgcmark.go 880ms 7.23% 29.25% 880ms 7.23% runtime.heapBitsForObject /usr/local/go/src/runtime/mbitmap.go 480ms 3.94% 33.20% 480ms 3.94% runtime.usleep /usr/local/go/src/runtime/sys_linux_amd64.s 420ms 3.45% 36.65% 420ms 3.45% runtime.greyobject /usr/local/go/src/runtime/mgcmark.go 410ms 3.37% 40.02% 420ms 3.45% runtime.mapiternext /usr/local/go/src/runtime/hashmap.go 390ms 3.20% 43.22% 1330ms 10.93% runtime.mapassign_faststr /usr/local/go/src/runtime/hashmap_fast.go 330ms 2.71% 45.93% 660ms 5.42% runtime.makemap /usr/local/go/src/runtime/hashmap.go 300ms 2.47% 48.40% 310ms 2.55% syscall.Syscall /usr/local/go/src/syscall/asm_linux_amd64.s 280ms 2.30% 50.70% 500ms 4.11% runtime.selectgo /usr/local/go/src/runtime/select.go 

看着 cpu 最高的都是scanobject

请教下，谢谢