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systemtap统计TCP连接数量
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| #!/usr/bin/stap | |
| global connections | |
| global filter_port = 80 | |
| // | |
| global report | |
| global spend_time | |
| global active_count | |
| global have_spend_time = 0 | |
| global histidx = 0 | |
| function on_close(saddr, sport, family){ | |
| conn_times = connections[saddr, sport] | |
| if (conn_times!=0) { | |
| ms = gettimeofday_ms() - conn_times | |
| spend_time <<< ms | |
| have_spend_time = 1 | |
| //printf("close %15s %5d ms=%d active_count=%d\n", format_ipaddr(ntohl(saddr), family), sport, ms, active_count) | |
| delete connections[saddr, sport] | |
| active_count-- | |
| } | |
| } | |
| function on_open(saddr, sport, family){ | |
| connections[saddr, sport] = gettimeofday_ms() | |
| //printf("accept %15s %5d\n", format_ipaddr(ntohl(saddr), family), sport) | |
| active_count++ | |
| } | |
| probe kernel.function("tcp_set_state"){ | |
| sk = $sk | |
| new_state = $state | |
| TCP_ESTABLISHED = 1 | |
| TCP_CLOSE = 7 | |
| TCP_CLOSE_WAIT = 8 | |
| if (tcpmib_local_port(sk)==filter_port){ | |
| if (new_state==TCP_CLOSE || new_state==TCP_CLOSE_WAIT){ | |
| on_close(tcpmib_remote_addr(sk), tcpmib_remote_port(sk), __ip_sock_family(sk)) | |
| } | |
| if (new_state==TCP_ESTABLISHED){ | |
| on_open(tcpmib_remote_addr(sk), tcpmib_remote_port(sk), __ip_sock_family(sk)) | |
| } | |
| } | |
| } | |
| probe timer.s(1){ | |
| histidx = histidx + 1 | |
| report[histidx, "active_count"] = active_count | |
| } | |
| probe begin { | |
| printf("start\n") | |
| } | |
| probe end{ | |
| printf("count=%d max=%d min=%d \n", @count(spend_time), @max(spend_time), @min(spend_time)) | |
| for(i=0; i!=histidx; i++){ | |
| printf("%d\t%d\n", i, report[i, "active_count"]) | |
| } | |
| } |
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原文作者： 写程序的康德
PS. 需要先安装kernel的debuginfo包，否则会报
semantic error: missing x86_64 kernel/module debuginfo