| // SPDX-License-Identifier: (LGPL-2.1 OR BSD-2-Clause) |
| // Copyright (c) 2022 Jingxiang Zeng |
| // |
| // Based on oomkill(8) from BCC by Brendan Gregg. |
| // 13-Jan-2022 Jingxiang Zeng Created this. |
| #include <argp.h> |
| #include <errno.h> |
| #include <signal.h> |
| #include <stdio.h> |
| #include <stdlib.h> |
| #include <string.h> |
| #include <time.h> |
| #include <unistd.h> |
| |
| #include <bpf/bpf.h> |
| #include <bpf/libbpf.h> |
| #include "oomkill.skel.h" |
| #include "oomkill.h" |
| #include "trace_helpers.h" |
| |
| #define PERF_POLL_TIMEOUT_MS 100 |
| |
| static volatile sig_atomic_t exiting = 0; |
| |
| static bool verbose = false; |
| |
| const char *argp_program_version = "oomkill 0.1"; |
| const char *argp_program_bug_address = |
| "https://github.com/iovisor/bcc/tree/master/libbpf-tools"; |
| const char argp_program_doc[] = |
| "Trace OOM kills.\n" |
| "\n" |
| "USAGE: oomkill [-h]\n" |
| "\n" |
| "EXAMPLES:\n" |
| " oomkill # trace OOM kills\n"; |
| |
| static const struct argp_option opts[] = { |
| { "verbose", 'v', NULL, 0, "Verbose debug output" }, |
| { NULL, 'h', NULL, OPTION_HIDDEN, "Show the full help" }, |
| {}, |
| }; |
| |
| static error_t parse_arg(int key, char *arg, struct argp_state *state) |
| { |
| switch (key) { |
| case 'v': |
| verbose = true; |
| break; |
| case 'h': |
| argp_state_help(state, stderr, ARGP_HELP_STD_HELP); |
| break; |
| default: |
| return ARGP_ERR_UNKNOWN; |
| } |
| return 0; |
| } |
| |
| static void handle_event(void *ctx, int cpu, void *data, __u32 data_sz) |
| { |
| FILE *f; |
| char buf[256]; |
| int n = 0; |
| struct tm *tm; |
| char ts[32]; |
| time_t t; |
| struct data_t *e = data; |
| |
| f = fopen("/proc/loadavg", "r"); |
| if (f) { |
| memset(buf, 0, sizeof(buf)); |
| n = fread(buf, 1, sizeof(buf), f); |
| fclose(f); |
| } |
| time(&t); |
| tm = localtime(&t); |
| strftime(ts, sizeof(ts), "%H:%M:%S", tm); |
| |
| if (n) |
| printf("%s Triggered by PID %d (\"%s\"), OOM kill of PID %d (\"%s\"), %lld pages, loadavg: %s\n", |
| ts, e->fpid, e->fcomm, e->tpid, e->tcomm, e->pages, buf); |
| else |
| printf("%s Triggered by PID %d (\"%s\"), OOM kill of PID %d (\"%s\"), %lld pages\n", |
| ts, e->fpid, e->fcomm, e->tpid, e->tcomm, e->pages); |
| } |
| |
| static void handle_lost_events(void *ctx, int cpu, __u64 lost_cnt) |
| { |
| printf("Lost %llu events on CPU #%d!\n", lost_cnt, cpu); |
| } |
| |
| static void sig_int(int signo) |
| { |
| exiting = 1; |
| } |
| |
| static int libbpf_print_fn(enum libbpf_print_level level, const char *format, va_list args) |
| { |
| if (level == LIBBPF_DEBUG && !verbose) |
| return 0; |
| return vfprintf(stderr, format, args); |
| } |
| |
| int main(int argc, char **argv) |
| { |
| static const struct argp argp = { |
| .options = opts, |
| .parser = parse_arg, |
| .doc = argp_program_doc, |
| }; |
| struct perf_buffer *pb = NULL; |
| struct oomkill_bpf *obj; |
| int err; |
| |
| err = argp_parse(&argp, argc, argv, 0, NULL, NULL); |
| if (err) |
| return err; |
| |
| libbpf_set_strict_mode(LIBBPF_STRICT_ALL); |
| libbpf_set_print(libbpf_print_fn); |
| |
| obj = oomkill_bpf__open_and_load(); |
| if (!obj) { |
| fprintf(stderr, "failed to load and open BPF object\n"); |
| return 1; |
| } |
| |
| err = oomkill_bpf__attach(obj); |
| if (err) { |
| fprintf(stderr, "failed to attach BPF programs\n"); |
| goto cleanup; |
| } |
| |
| pb = perf_buffer__new(bpf_map__fd(obj->maps.events), 64, |
| handle_event, handle_lost_events, NULL, NULL); |
| if (!pb) { |
| err = -errno; |
| fprintf(stderr, "failed to open perf buffer: %d\n", err); |
| goto cleanup; |
| } |
| |
| if (signal(SIGINT, sig_int) == SIG_ERR) { |
| fprintf(stderr, "can't set signal handler: %d\n", err); |
| err = 1; |
| goto cleanup; |
| } |
| |
| printf("Tracing OOM kills... Ctrl-C to stop.\n"); |
| |
| while (!exiting) { |
| err = perf_buffer__poll(pb, PERF_POLL_TIMEOUT_MS); |
| if (err < 0 && err != -EINTR) { |
| fprintf(stderr, "error polling perf buffer: %d\n", err); |
| goto cleanup; |
| } |
| /* reset err to return 0 if exiting */ |
| err = 0; |
| } |
| |
| cleanup: |
| perf_buffer__free(pb); |
| oomkill_bpf__destroy(obj); |
| |
| return err != 0; |
| } |