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bridge_loop.bt
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#!/usr/bin/env bpftrace /* * Copyright (c) 2021 Red Hat, Inc. * * Licensed under the Apache License, Version 2.0 (the "License"); * you may not use this file except in compliance with the License. * You may obtain a copy of the License at: * * http://www.apache.org/licenses/LICENSE-2.0 * * Unless required by applicable law or agreed to in writing, software * distributed under the License is distributed on an "AS IS" BASIS, * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. * See the License for the specific language governing permissions and * limitations under the License. * * * Script information: * ------------------- * bridge_loop.bt uses the USDTs in the ovs-vswitchd's main bridge loop * to report how long it spends running a single loop, as well as the time * it spends waiting in the poll_loop(). Once done, it will also print a * histogram for the time spent. * * The following is an example of how to use the script on the running * ovs-vswitchd process: * * $ bridge_loop.bt -p `pgrep -n ovs-vswitchd` * Attaching 4 probes... * -------------------------------------------------------------- * Tracing ovs-vswitchd's main() loop... Hit Ctrl-C to end. * -------------------------------------------------------------- * - [886467@ovs-vswitchd] bridge run loop time : 0:00:00.000230706 * - [886467@ovs-vswitchd] poll_block() wait time: 0:00:00.501854292 * - [886467@ovs-vswitchd] bridge run loop time : 0:00:00.000266445 * - [886467@ovs-vswitchd] poll_block() wait time: 0:00:00.499750288 * - [886467@ovs-vswitchd] bridge run loop time : 0:00:00.000254856 * - [886467@ovs-vswitchd] poll_block() wait time: 0:00:00.499944280 * - [886467@ovs-vswitchd] bridge run loop time : 0:00:00.000267390 * - [886467@ovs-vswitchd] poll_block() wait time: 0:00:00.093566288 * - [886467@ovs-vswitchd] bridge run loop time : 0:00:00.000316774 * - [886467@ovs-vswitchd] poll_block() wait time: 0:00:00.406697754 * - [886467@ovs-vswitchd] bridge run loop time : 0:00:00.000264505 * ^C * -------------------------------------------------------------- * Showing run time histograms in micro seconds: * -------------------------------------------------------------- * * @bridge_run_time: * [0, 1000) 6 |@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@| * * * @poll_block_wait_time: * [90000, 120000) 1 |@@@@@@@@@@@@@@@@@ | * [120000, 150000) 0 | | * [150000, 180000) 0 | | * [180000, 210000) 0 | | * [210000, 240000) 0 | | * [240000, 270000) 0 | | * [270000, 300000) 0 | | * [300000, 330000) 0 | | * [330000, 360000) 0 | | * [360000, 390000) 0 | | * [390000, 420000) 1 |@@@@@@@@@@@@@@@@@ | * [420000, 450000) 0 | | * [450000, 480000) 0 | | * [480000, 510000) 3 |@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@| */ BEGIN { printf("--------------------------------------------------------------\n"); printf("Tracing ovs-vswitchd's main() loop... Hit Ctrl-C to end.\n"); printf("--------------------------------------------------------------\n"); } usdt::main:poll_block { @pb_start[tid] = nsecs; if (@rs_start[tid] != 0) { $delta = nsecs - @rs_start[tid]; printf("- [%d@%s] bridge run loop time : %u:%2.2u:%2.2u.%9.9u\n", tid, comm, $delta / 3600 / 1000000000, $delta / 60 / 1000000000 % 60, $delta / 1000000000 % 60, $delta % 1000000000); @bridge_run_time = lhist($delta / 1000, 0, 1000000, 1000); } } usdt::main:run_start { @rs_start[tid] = nsecs; if (@pb_start[tid] != 0) { $delta = nsecs - @pb_start[tid]; printf("- [%d@%s] poll_block() wait time: %u:%2.2u:%2.2u.%9.9u\n", tid, comm, $delta / 3600 / 1000000000, $delta / 60 / 1000000000 % 60, $delta / 1000000000 % 60, $delta % 1000000000); @poll_block_wait_time = lhist($delta / 1000, 0, 30000000, 30000); } } END { clear(@rs_start); clear(@pb_start); printf("\n"); printf("--------------------------------------------------------------\n"); printf("Showing run time histograms in micro seconds:\n"); printf("--------------------------------------------------------------"); }