diff options
Diffstat (limited to '')
| -rw-r--r-- | tools/testing/selftests/bpf/benchs/bench_trigger.c | 273 |
1 files changed, 254 insertions, 19 deletions
diff --git a/tools/testing/selftests/bpf/benchs/bench_trigger.c b/tools/testing/selftests/bpf/benchs/bench_trigger.c index 2a0b6c9885a4..ace0d1011a8e 100644 --- a/tools/testing/selftests/bpf/benchs/bench_trigger.c +++ b/tools/testing/selftests/bpf/benchs/bench_trigger.c @@ -2,6 +2,7 @@ /* Copyright (c) 2020 Facebook */ #include "bench.h" #include "trigger_bench.skel.h" +#include "trace_helpers.h" /* BPF triggering benchmarks */ static struct trigger_ctx { @@ -10,10 +11,10 @@ static struct trigger_ctx { static struct counter base_hits; -static void trigger_validate() +static void trigger_validate(void) { - if (env.consumer_cnt != 1) { - fprintf(stderr, "benchmark doesn't support multi-consumer!\n"); + if (env.consumer_cnt != 0) { + fprintf(stderr, "benchmark doesn't support consumer!\n"); exit(1); } } @@ -44,7 +45,7 @@ static void trigger_measure(struct bench_res *res) res->hits = atomic_swap(&ctx.skel->bss->hits, 0); } -static void setup_ctx() +static void setup_ctx(void) { setup_libbpf(); @@ -60,58 +61,195 @@ static void attach_bpf(struct bpf_program *prog) struct bpf_link *link; link = bpf_program__attach(prog); - if (IS_ERR(link)) { + if (!link) { fprintf(stderr, "failed to attach program!\n"); exit(1); } } -static void trigger_tp_setup() +static void trigger_tp_setup(void) { setup_ctx(); attach_bpf(ctx.skel->progs.bench_trigger_tp); } -static void trigger_rawtp_setup() +static void trigger_rawtp_setup(void) { setup_ctx(); attach_bpf(ctx.skel->progs.bench_trigger_raw_tp); } -static void trigger_kprobe_setup() +static void trigger_kprobe_setup(void) { setup_ctx(); attach_bpf(ctx.skel->progs.bench_trigger_kprobe); } -static void trigger_fentry_setup() +static void trigger_kretprobe_setup(void) +{ + setup_ctx(); + attach_bpf(ctx.skel->progs.bench_trigger_kretprobe); +} + +static void trigger_kprobe_multi_setup(void) +{ + setup_ctx(); + attach_bpf(ctx.skel->progs.bench_trigger_kprobe_multi); +} + +static void trigger_kretprobe_multi_setup(void) +{ + setup_ctx(); + attach_bpf(ctx.skel->progs.bench_trigger_kretprobe_multi); +} + +static void trigger_fentry_setup(void) { setup_ctx(); attach_bpf(ctx.skel->progs.bench_trigger_fentry); } -static void trigger_fentry_sleep_setup() +static void trigger_fexit_setup(void) +{ + setup_ctx(); + attach_bpf(ctx.skel->progs.bench_trigger_fexit); +} + +static void trigger_fentry_sleep_setup(void) { setup_ctx(); attach_bpf(ctx.skel->progs.bench_trigger_fentry_sleep); } -static void trigger_fmodret_setup() +static void trigger_fmodret_setup(void) { setup_ctx(); attach_bpf(ctx.skel->progs.bench_trigger_fmodret); } -static void *trigger_consumer(void *input) +/* make sure call is not inlined and not avoided by compiler, so __weak and + * inline asm volatile in the body of the function + * + * There is a performance difference between uprobing at nop location vs other + * instructions. So use two different targets, one of which starts with nop + * and another doesn't. + * + * GCC doesn't generate stack setup preample for these functions due to them + * having no input arguments and doing nothing in the body. + */ +__weak void uprobe_target_nop(void) +{ + asm volatile ("nop"); +} + +__weak void opaque_noop_func(void) +{ +} + +__weak int uprobe_target_push(void) +{ + /* overhead of function call is negligible compared to uprobe + * triggering, so this shouldn't affect benchmark results much + */ + opaque_noop_func(); + return 1; +} + +__weak void uprobe_target_ret(void) +{ + asm volatile (""); +} + +static void *uprobe_base_producer(void *input) { + while (true) { + uprobe_target_nop(); + atomic_inc(&base_hits.value); + } + return NULL; +} + +static void *uprobe_producer_nop(void *input) +{ + while (true) + uprobe_target_nop(); return NULL; } +static void *uprobe_producer_push(void *input) +{ + while (true) + uprobe_target_push(); + return NULL; +} + +static void *uprobe_producer_ret(void *input) +{ + while (true) + uprobe_target_ret(); + return NULL; +} + +static void usetup(bool use_retprobe, void *target_addr) +{ + size_t uprobe_offset; + struct bpf_link *link; + + setup_libbpf(); + + ctx.skel = trigger_bench__open_and_load(); + if (!ctx.skel) { + fprintf(stderr, "failed to open skeleton\n"); + exit(1); + } + + uprobe_offset = get_uprobe_offset(target_addr); + link = bpf_program__attach_uprobe(ctx.skel->progs.bench_trigger_uprobe, + use_retprobe, + -1 /* all PIDs */, + "/proc/self/exe", + uprobe_offset); + if (!link) { + fprintf(stderr, "failed to attach uprobe!\n"); + exit(1); + } + ctx.skel->links.bench_trigger_uprobe = link; +} + +static void uprobe_setup_nop(void) +{ + usetup(false, &uprobe_target_nop); +} + +static void uretprobe_setup_nop(void) +{ + usetup(true, &uprobe_target_nop); +} + +static void uprobe_setup_push(void) +{ + usetup(false, &uprobe_target_push); +} + +static void uretprobe_setup_push(void) +{ + usetup(true, &uprobe_target_push); +} + +static void uprobe_setup_ret(void) +{ + usetup(false, &uprobe_target_ret); +} + +static void uretprobe_setup_ret(void) +{ + usetup(true, &uprobe_target_ret); +} + const struct bench bench_trig_base = { .name = "trig-base", .validate = trigger_validate, .producer_thread = trigger_base_producer, - .consumer_thread = trigger_consumer, .measure = trigger_base_measure, .report_progress = hits_drops_report_progress, .report_final = hits_drops_report_final, @@ -122,7 +260,6 @@ const struct bench bench_trig_tp = { .validate = trigger_validate, .setup = trigger_tp_setup, .producer_thread = trigger_producer, - .consumer_thread = trigger_consumer, .measure = trigger_measure, .report_progress = hits_drops_report_progress, .report_final = hits_drops_report_final, @@ -133,7 +270,6 @@ const struct bench bench_trig_rawtp = { .validate = trigger_validate, .setup = trigger_rawtp_setup, .producer_thread = trigger_producer, - .consumer_thread = trigger_consumer, .measure = trigger_measure, .report_progress = hits_drops_report_progress, .report_final = hits_drops_report_final, @@ -144,7 +280,36 @@ const struct bench bench_trig_kprobe = { .validate = trigger_validate, .setup = trigger_kprobe_setup, .producer_thread = trigger_producer, - .consumer_thread = trigger_consumer, + .measure = trigger_measure, + .report_progress = hits_drops_report_progress, + .report_final = hits_drops_report_final, +}; + +const struct bench bench_trig_kretprobe = { + .name = "trig-kretprobe", + .validate = trigger_validate, + .setup = trigger_kretprobe_setup, + .producer_thread = trigger_producer, + .measure = trigger_measure, + .report_progress = hits_drops_report_progress, + .report_final = hits_drops_report_final, +}; + +const struct bench bench_trig_kprobe_multi = { + .name = "trig-kprobe-multi", + .validate = trigger_validate, + .setup = trigger_kprobe_multi_setup, + .producer_thread = trigger_producer, + .measure = trigger_measure, + .report_progress = hits_drops_report_progress, + .report_final = hits_drops_report_final, +}; + +const struct bench bench_trig_kretprobe_multi = { + .name = "trig-kretprobe-multi", + .validate = trigger_validate, + .setup = trigger_kretprobe_multi_setup, + .producer_thread = trigger_producer, .measure = trigger_measure, .report_progress = hits_drops_report_progress, .report_final = hits_drops_report_final, @@ -155,7 +320,16 @@ const struct bench bench_trig_fentry = { .validate = trigger_validate, .setup = trigger_fentry_setup, .producer_thread = trigger_producer, - .consumer_thread = trigger_consumer, + .measure = trigger_measure, + .report_progress = hits_drops_report_progress, + .report_final = hits_drops_report_final, +}; + +const struct bench bench_trig_fexit = { + .name = "trig-fexit", + .validate = trigger_validate, + .setup = trigger_fexit_setup, + .producer_thread = trigger_producer, .measure = trigger_measure, .report_progress = hits_drops_report_progress, .report_final = hits_drops_report_final, @@ -166,7 +340,6 @@ const struct bench bench_trig_fentry_sleep = { .validate = trigger_validate, .setup = trigger_fentry_sleep_setup, .producer_thread = trigger_producer, - .consumer_thread = trigger_consumer, .measure = trigger_measure, .report_progress = hits_drops_report_progress, .report_final = hits_drops_report_final, @@ -177,7 +350,69 @@ const struct bench bench_trig_fmodret = { .validate = trigger_validate, .setup = trigger_fmodret_setup, .producer_thread = trigger_producer, - .consumer_thread = trigger_consumer, + .measure = trigger_measure, + .report_progress = hits_drops_report_progress, + .report_final = hits_drops_report_final, +}; + +const struct bench bench_trig_uprobe_base = { + .name = "trig-uprobe-base", + .setup = NULL, /* no uprobe/uretprobe is attached */ + .producer_thread = uprobe_base_producer, + .measure = trigger_base_measure, + .report_progress = hits_drops_report_progress, + .report_final = hits_drops_report_final, +}; + +const struct bench bench_trig_uprobe_nop = { + .name = "trig-uprobe-nop", + .setup = uprobe_setup_nop, + .producer_thread = uprobe_producer_nop, + .measure = trigger_measure, + .report_progress = hits_drops_report_progress, + .report_final = hits_drops_report_final, +}; + +const struct bench bench_trig_uretprobe_nop = { + .name = "trig-uretprobe-nop", + .setup = uretprobe_setup_nop, + .producer_thread = uprobe_producer_nop, + .measure = trigger_measure, + .report_progress = hits_drops_report_progress, + .report_final = hits_drops_report_final, +}; + +const struct bench bench_trig_uprobe_push = { + .name = "trig-uprobe-push", + .setup = uprobe_setup_push, + .producer_thread = uprobe_producer_push, + .measure = trigger_measure, + .report_progress = hits_drops_report_progress, + .report_final = hits_drops_report_final, +}; + +const struct bench bench_trig_uretprobe_push = { + .name = "trig-uretprobe-push", + .setup = uretprobe_setup_push, + .producer_thread = uprobe_producer_push, + .measure = trigger_measure, + .report_progress = hits_drops_report_progress, + .report_final = hits_drops_report_final, +}; + +const struct bench bench_trig_uprobe_ret = { + .name = "trig-uprobe-ret", + .setup = uprobe_setup_ret, + .producer_thread = uprobe_producer_ret, + .measure = trigger_measure, + .report_progress = hits_drops_report_progress, + .report_final = hits_drops_report_final, +}; + +const struct bench bench_trig_uretprobe_ret = { + .name = "trig-uretprobe-ret", + .setup = uretprobe_setup_ret, + .producer_thread = uprobe_producer_ret, .measure = trigger_measure, .report_progress = hits_drops_report_progress, .report_final = hits_drops_report_final, |