Adding support to call bpf_get_stackid helper from trigger programs, so far added for kprobe multi.
Adding the --stacktrace/-g option to enable it. Signed-off-by: Jiri Olsa <[email protected]> --- tools/testing/selftests/bpf/bench.c | 4 ++++ tools/testing/selftests/bpf/bench.h | 1 + .../selftests/bpf/benchs/bench_trigger.c | 1 + .../selftests/bpf/progs/trigger_bench.c | 18 ++++++++++++++++++ 4 files changed, 24 insertions(+) diff --git a/tools/testing/selftests/bpf/bench.c b/tools/testing/selftests/bpf/bench.c index bd29bb2e6cb5..8dadd9c928ec 100644 --- a/tools/testing/selftests/bpf/bench.c +++ b/tools/testing/selftests/bpf/bench.c @@ -265,6 +265,7 @@ static const struct argp_option opts[] = { { "verbose", 'v', NULL, 0, "Verbose debug output"}, { "affinity", 'a', NULL, 0, "Set consumer/producer thread affinity"}, { "quiet", 'q', NULL, 0, "Be more quiet"}, + { "stacktrace", 'g', NULL, 0, "Get stack trace"}, { "prod-affinity", ARG_PROD_AFFINITY_SET, "CPUSET", 0, "Set of CPUs for producer threads; implies --affinity"}, { "cons-affinity", ARG_CONS_AFFINITY_SET, "CPUSET", 0, @@ -350,6 +351,9 @@ static error_t parse_arg(int key, char *arg, struct argp_state *state) case 'q': env.quiet = true; break; + case 'g': + env.stacktrace = true; + break; case ARG_PROD_AFFINITY_SET: env.affinity = true; if (parse_num_list(arg, &env.prod_cpus.cpus, diff --git a/tools/testing/selftests/bpf/bench.h b/tools/testing/selftests/bpf/bench.h index bea323820ffb..7cf21936e7ed 100644 --- a/tools/testing/selftests/bpf/bench.h +++ b/tools/testing/selftests/bpf/bench.h @@ -26,6 +26,7 @@ struct env { bool list; bool affinity; bool quiet; + bool stacktrace; int consumer_cnt; int producer_cnt; int nr_cpus; diff --git a/tools/testing/selftests/bpf/benchs/bench_trigger.c b/tools/testing/selftests/bpf/benchs/bench_trigger.c index 34018fc3927f..aeec9edd3851 100644 --- a/tools/testing/selftests/bpf/benchs/bench_trigger.c +++ b/tools/testing/selftests/bpf/benchs/bench_trigger.c @@ -146,6 +146,7 @@ static void setup_ctx(void) bpf_program__set_autoload(ctx.skel->progs.trigger_driver, true); ctx.skel->rodata->batch_iters = args.batch_iters; + ctx.skel->rodata->stacktrace = env.stacktrace; } static void load_ctx(void) diff --git a/tools/testing/selftests/bpf/progs/trigger_bench.c b/tools/testing/selftests/bpf/progs/trigger_bench.c index 2898b3749d07..479400d96fa4 100644 --- a/tools/testing/selftests/bpf/progs/trigger_bench.c +++ b/tools/testing/selftests/bpf/progs/trigger_bench.c @@ -25,6 +25,23 @@ static __always_inline void inc_counter(void) __sync_add_and_fetch(&hits[cpu & CPU_MASK].value, 1); } +volatile const int stacktrace; + +typedef __u64 stack_trace_t[128]; + +struct { + __uint(type, BPF_MAP_TYPE_STACK_TRACE); + __uint(max_entries, 16384); + __type(key, __u32); + __type(value, stack_trace_t); +} stackmap SEC(".maps"); + +static __always_inline void do_stacktrace(void *ctx) +{ + if (stacktrace) + bpf_get_stackid(ctx, &stackmap, 0); +} + SEC("?uprobe") int bench_trigger_uprobe(void *ctx) { @@ -96,6 +113,7 @@ SEC("?kprobe.multi/bpf_get_numa_node_id") int bench_trigger_kprobe_multi(void *ctx) { inc_counter(); + do_stacktrace(ctx); return 0; } -- 2.52.0
