237 lines
4.8 KiB
Ucode
Executable File
237 lines
4.8 KiB
Ucode
Executable File
#!/usr/bin/env ucode
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'use strict';
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import { glob, basename, dirname, readlink, readfile, realpath, writefile, error, open } from "fs";
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let napi_weight = 1.0;
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let cpu_thread_weight = 0.75;
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let rx_weight = 0.75;
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let eth_bias = 2.0;
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let debug = 0, do_nothing = 0;
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let disable;
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let cpus;
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let all_cpus;
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let local_flows = 0;
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while (length(ARGV) > 0) {
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let arg = shift(ARGV);
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switch (arg) {
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case "-d":
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debug++;
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break;
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case "-n":
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do_nothing++;
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break;
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case '0':
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disable = true;
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break;
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case '2':
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all_cpus = true;
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break;
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case '-l':
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local_flows = +shift(ARGV);
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break;
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}
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}
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function task_name(pid)
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{
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let stat = open(`/proc/${pid}/status`, "r");
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if (!stat)
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return;
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let line = stat.read("line");
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stat.close();
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return trim(split(line, "\t", 2)[1]);
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}
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function set_task_cpu(pid, cpu) {
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if (disable)
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cpu = join(",", map(cpus, (cpu) => cpu.id));
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let name = task_name(pid);
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if (!name)
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return;
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if (debug || do_nothing)
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warn(`taskset -p -c ${cpu} ${name}\n`);
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if (!do_nothing)
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system(`taskset -p -c ${cpu} ${pid}`);
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}
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function cpu_mask(cpu)
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{
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let mask;
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if (cpu < 0)
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mask = (1 << length(cpus)) - 1;
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else
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mask = (1 << int(cpu));
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return sprintf("%x", mask);
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}
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function set_netdev_cpu(dev, cpu) {
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let queues = glob(`/sys/class/net/${dev}/queues/rx-*/rps_cpus`);
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let val = cpu_mask(cpu);
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if (disable)
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val = 0;
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for (let queue in queues) {
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if (debug || do_nothing)
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warn(`echo ${val} > ${queue}\n`);
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if (!do_nothing)
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writefile(queue, `${val}`);
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}
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queues = glob(`/sys/class/net/${dev}/queues/rx-*/rps_flow_cnt`);
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for (let queue in queues) {
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if (debug || do_nothing)
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warn(`echo ${local_flows} > ${queue}\n`);
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if (!do_nothing)
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writefile(queue, `${local_flows}`);
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}
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}
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function task_device_match(name, device)
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{
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let napi_match = match(name, /napi\/([^-+])-\d+/);
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if (!napi_match)
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napi_match = match(name, /mt76-tx (phy\d+)/);
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if (napi_match &&
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(index(device.phy, napi_match[1]) >= 0 ||
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index(device.netdev, napi_match[1]) >= 0))
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return true;
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if (device.driver == "mtk_soc_eth" && match(name, /napi\/mtk_eth-/))
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return true;
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return false;
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}
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cpus = map(glob("/sys/bus/cpu/devices/*"), (path) => {
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return {
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id: int(match(path, /.*cpu(\d+)/)[1]),
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core: int(trim(readfile(`${path}/topology/core_id`))),
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load: 0.0,
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};
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});
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cpus = slice(cpus, 0, 64);
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if (length(cpus) < 2)
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exit(0);
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function cpu_add_weight(cpu_id, weight)
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{
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let cpu = cpus[cpu_id];
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cpu.load += weight;
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for (let sibling in cpus) {
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if (sibling == cpu || sibling.core != cpu.core)
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continue;
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sibling.load += weight * cpu_thread_weight;
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}
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}
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function get_next_cpu(weight, prev_cpu)
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{
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if (disable)
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return 0;
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let sort_cpus = sort(slice(cpus), (a, b) => a.load - b.load);
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let idx = 0;
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if (prev_cpu != null && sort_cpus[idx].id == prev_cpu)
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idx++;
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let cpu = sort_cpus[idx].id;
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cpu_add_weight(cpu, weight);
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return cpu;
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}
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let phys_devs = {};
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let netdev_phys = {};
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let netdevs = map(glob("/sys/class/net/*"), (dev) => basename(dev));
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for (let dev in netdevs) {
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let pdev_path = realpath(`/sys/class/net/${dev}/device`);
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if (!pdev_path)
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continue;
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if (length(glob(`/sys/class/net/${dev}/lower_*`)) > 0)
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continue;
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let pdev = phys_devs[pdev_path];
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if (!pdev) {
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pdev = phys_devs[pdev_path] = {
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path: pdev_path,
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driver: basename(readlink(`${pdev_path}/driver`)),
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netdev: [],
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phy: [],
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tasks: [],
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};
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}
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let phyidx = trim(readfile(`/sys/class/net/${dev}/phy80211/index`));
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if (phyidx != null) {
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let phy = `phy${phyidx}`;
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if (index(pdev.phy, phy) < 0)
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push(pdev.phy, phy);
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}
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push(pdev.netdev, dev);
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netdev_phys[dev] = pdev;
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}
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for (let path in glob("/proc/*/exe")) {
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readlink(path);
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if (error() != "No such file or directory")
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continue;
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let pid = basename(dirname(path));
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let name = task_name(pid);
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for (let devname in phys_devs) {
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let dev = phys_devs[devname];
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if (!task_device_match(name, dev))
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continue;
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push(dev.tasks, pid);
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break;
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}
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}
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function assign_dev_cpu(dev) {
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if (length(dev.tasks) > 0) {
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let cpu = dev.napi_cpu = get_next_cpu(napi_weight);
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for (let task in dev.tasks)
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set_task_cpu(task, cpu);
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}
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if (length(dev.netdev) > 0) {
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let cpu;
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if (all_cpus)
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cpu = -1;
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else
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cpu = get_next_cpu(rx_weight, dev.napi_cpu);
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dev.rx_cpu = cpu;
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for (let netdev in dev.netdev)
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set_netdev_cpu(netdev, cpu);
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}
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}
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// Assign ethernet devices first
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for (let devname in phys_devs) {
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let dev = phys_devs[devname];
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if (!length(dev.phy))
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assign_dev_cpu(dev);
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}
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// Add bias to avoid assigning other tasks to CPUs with ethernet NAPI
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for (let devname in phys_devs) {
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let dev = phys_devs[devname];
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if (!length(dev.tasks) || dev.napi_cpu == null)
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continue;
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cpu_add_weight(dev.napi_cpu, eth_bias);
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}
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// Assign WLAN devices
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for (let devname in phys_devs) {
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let dev = phys_devs[devname];
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if (length(dev.phy) > 0)
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assign_dev_cpu(dev);
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}
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if (debug > 1)
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warn(sprintf("devices: %.J\ncpus: %.J\n", phys_devs, cpus));
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