308 lines
7.0 KiB
C
308 lines
7.0 KiB
C
// SPDX-License-Identifier: GPL-2.0
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/* Copyright (c) 2021 Facebook */
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/* Copyright (c) 2021 Google */
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#include <assert.h>
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#include <limits.h>
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#include <unistd.h>
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#include <sys/file.h>
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#include <sys/time.h>
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#include <sys/resource.h>
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#include <linux/err.h>
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#include <linux/zalloc.h>
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#include <linux/perf_event.h>
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#include <api/fs/fs.h>
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#include <perf/bpf_perf.h>
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#include "affinity.h"
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#include "bpf_counter.h"
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#include "cgroup.h"
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#include "counts.h"
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#include "debug.h"
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#include "evsel.h"
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#include "evlist.h"
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#include "target.h"
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#include "cpumap.h"
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#include "thread_map.h"
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#include "bpf_skel/bperf_cgroup.skel.h"
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static struct perf_event_attr cgrp_switch_attr = {
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.type = PERF_TYPE_SOFTWARE,
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.config = PERF_COUNT_SW_CGROUP_SWITCHES,
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.size = sizeof(cgrp_switch_attr),
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.sample_period = 1,
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.disabled = 1,
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};
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static struct evsel *cgrp_switch;
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static struct bperf_cgroup_bpf *skel;
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#define FD(evt, cpu) (*(int *)xyarray__entry(evt->core.fd, cpu, 0))
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static int bperf_load_program(struct evlist *evlist)
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{
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struct bpf_link *link;
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struct evsel *evsel;
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struct cgroup *cgrp, *leader_cgrp;
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__u32 i, cpu;
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__u32 nr_cpus = evlist->core.all_cpus->nr;
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int total_cpus = cpu__max_cpu();
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int map_size, map_fd;
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int prog_fd, err;
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skel = bperf_cgroup_bpf__open();
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if (!skel) {
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pr_err("Failed to open cgroup skeleton\n");
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return -1;
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}
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skel->rodata->num_cpus = total_cpus;
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skel->rodata->num_events = evlist->core.nr_entries / nr_cgroups;
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BUG_ON(evlist->core.nr_entries % nr_cgroups != 0);
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/* we need one copy of events per cpu for reading */
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map_size = total_cpus * evlist->core.nr_entries / nr_cgroups;
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bpf_map__resize(skel->maps.events, map_size);
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bpf_map__resize(skel->maps.cgrp_idx, nr_cgroups);
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/* previous result is saved in a per-cpu array */
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map_size = evlist->core.nr_entries / nr_cgroups;
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bpf_map__resize(skel->maps.prev_readings, map_size);
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/* cgroup result needs all events (per-cpu) */
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map_size = evlist->core.nr_entries;
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bpf_map__resize(skel->maps.cgrp_readings, map_size);
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set_max_rlimit();
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err = bperf_cgroup_bpf__load(skel);
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if (err) {
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pr_err("Failed to load cgroup skeleton\n");
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goto out;
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}
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if (cgroup_is_v2("perf_event") > 0)
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skel->bss->use_cgroup_v2 = 1;
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err = -1;
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cgrp_switch = evsel__new(&cgrp_switch_attr);
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if (evsel__open_per_cpu(cgrp_switch, evlist->core.all_cpus, -1) < 0) {
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pr_err("Failed to open cgroup switches event\n");
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goto out;
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}
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for (i = 0; i < nr_cpus; i++) {
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link = bpf_program__attach_perf_event(skel->progs.on_cgrp_switch,
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FD(cgrp_switch, i));
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if (IS_ERR(link)) {
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pr_err("Failed to attach cgroup program\n");
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err = PTR_ERR(link);
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goto out;
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}
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}
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/*
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* Update cgrp_idx map from cgroup-id to event index.
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*/
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cgrp = NULL;
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i = 0;
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evlist__for_each_entry(evlist, evsel) {
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if (cgrp == NULL || evsel->cgrp == leader_cgrp) {
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leader_cgrp = evsel->cgrp;
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evsel->cgrp = NULL;
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/* open single copy of the events w/o cgroup */
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err = evsel__open_per_cpu(evsel, evlist->core.all_cpus, -1);
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if (err) {
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pr_err("Failed to open first cgroup events\n");
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goto out;
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}
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map_fd = bpf_map__fd(skel->maps.events);
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for (cpu = 0; cpu < nr_cpus; cpu++) {
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int fd = FD(evsel, cpu);
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__u32 idx = evsel->core.idx * total_cpus +
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evlist->core.all_cpus->map[cpu];
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err = bpf_map_update_elem(map_fd, &idx, &fd,
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BPF_ANY);
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if (err < 0) {
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pr_err("Failed to update perf_event fd\n");
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goto out;
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}
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}
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evsel->cgrp = leader_cgrp;
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}
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evsel->supported = true;
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if (evsel->cgrp == cgrp)
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continue;
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cgrp = evsel->cgrp;
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if (read_cgroup_id(cgrp) < 0) {
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pr_err("Failed to get cgroup id\n");
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err = -1;
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goto out;
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}
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map_fd = bpf_map__fd(skel->maps.cgrp_idx);
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err = bpf_map_update_elem(map_fd, &cgrp->id, &i, BPF_ANY);
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if (err < 0) {
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pr_err("Failed to update cgroup index map\n");
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goto out;
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}
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i++;
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}
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/*
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* bperf uses BPF_PROG_TEST_RUN to get accurate reading. Check
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* whether the kernel support it
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*/
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prog_fd = bpf_program__fd(skel->progs.trigger_read);
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err = bperf_trigger_reading(prog_fd, 0);
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if (err) {
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pr_warning("The kernel does not support test_run for raw_tp BPF programs.\n"
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"Therefore, --for-each-cgroup might show inaccurate readings\n");
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err = 0;
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}
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out:
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return err;
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}
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static int bperf_cgrp__load(struct evsel *evsel,
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struct target *target __maybe_unused)
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{
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static bool bperf_loaded = false;
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evsel->bperf_leader_prog_fd = -1;
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evsel->bperf_leader_link_fd = -1;
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if (!bperf_loaded && bperf_load_program(evsel->evlist))
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return -1;
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bperf_loaded = true;
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/* just to bypass bpf_counter_skip() */
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evsel->follower_skel = (struct bperf_follower_bpf *)skel;
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return 0;
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}
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static int bperf_cgrp__install_pe(struct evsel *evsel __maybe_unused,
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int cpu __maybe_unused, int fd __maybe_unused)
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{
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/* nothing to do */
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return 0;
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}
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/*
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* trigger the leader prog on each cpu, so the cgrp_reading map could get
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* the latest results.
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*/
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static int bperf_cgrp__sync_counters(struct evlist *evlist)
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{
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int i, cpu;
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int nr_cpus = evlist->core.all_cpus->nr;
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int prog_fd = bpf_program__fd(skel->progs.trigger_read);
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for (i = 0; i < nr_cpus; i++) {
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cpu = evlist->core.all_cpus->map[i];
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bperf_trigger_reading(prog_fd, cpu);
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}
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return 0;
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}
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static int bperf_cgrp__enable(struct evsel *evsel)
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{
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if (evsel->core.idx)
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return 0;
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bperf_cgrp__sync_counters(evsel->evlist);
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skel->bss->enabled = 1;
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return 0;
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}
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static int bperf_cgrp__disable(struct evsel *evsel)
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{
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if (evsel->core.idx)
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return 0;
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bperf_cgrp__sync_counters(evsel->evlist);
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skel->bss->enabled = 0;
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return 0;
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}
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static int bperf_cgrp__read(struct evsel *evsel)
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{
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struct evlist *evlist = evsel->evlist;
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int i, cpu, nr_cpus = evlist->core.all_cpus->nr;
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int total_cpus = cpu__max_cpu();
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struct perf_counts_values *counts;
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struct bpf_perf_event_value *values;
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int reading_map_fd, err = 0;
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__u32 idx;
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if (evsel->core.idx)
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return 0;
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bperf_cgrp__sync_counters(evsel->evlist);
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values = calloc(total_cpus, sizeof(*values));
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if (values == NULL)
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return -ENOMEM;
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reading_map_fd = bpf_map__fd(skel->maps.cgrp_readings);
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evlist__for_each_entry(evlist, evsel) {
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idx = evsel->core.idx;
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err = bpf_map_lookup_elem(reading_map_fd, &idx, values);
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if (err) {
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pr_err("bpf map lookup falied: idx=%u, event=%s, cgrp=%s\n",
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idx, evsel__name(evsel), evsel->cgrp->name);
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goto out;
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}
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for (i = 0; i < nr_cpus; i++) {
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cpu = evlist->core.all_cpus->map[i];
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counts = perf_counts(evsel->counts, i, 0);
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counts->val = values[cpu].counter;
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counts->ena = values[cpu].enabled;
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counts->run = values[cpu].running;
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}
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}
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out:
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free(values);
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return err;
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}
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static int bperf_cgrp__destroy(struct evsel *evsel)
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{
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if (evsel->core.idx)
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return 0;
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bperf_cgroup_bpf__destroy(skel);
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evsel__delete(cgrp_switch); // it'll destroy on_switch progs too
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return 0;
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}
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struct bpf_counter_ops bperf_cgrp_ops = {
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.load = bperf_cgrp__load,
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.enable = bperf_cgrp__enable,
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.disable = bperf_cgrp__disable,
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.read = bperf_cgrp__read,
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.install_pe = bperf_cgrp__install_pe,
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.destroy = bperf_cgrp__destroy,
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};
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