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Message-ID: <ZzkSXTjGxNGnpzZX@krava>
Date: Sat, 16 Nov 2024 22:45:01 +0100
From: Jiri Olsa <olsajiri@...il.com>
To: Andrii Nakryiko <andrii.nakryiko@...il.com>
Cc: Oleg Nesterov <oleg@...hat.com>, Peter Zijlstra <peterz@...radead.org>,
Andrii Nakryiko <andrii@...nel.org>, bpf@...r.kernel.org,
Song Liu <songliubraving@...com>, Yonghong Song <yhs@...com>,
John Fastabend <john.fastabend@...il.com>,
Hao Luo <haoluo@...gle.com>, Steven Rostedt <rostedt@...dmis.org>,
Masami Hiramatsu <mhiramat@...nel.org>,
Alan Maguire <alan.maguire@...cle.com>,
linux-kernel@...r.kernel.org, linux-trace-kernel@...r.kernel.org
Subject: Re: [RFC bpf-next 09/11] selftests/bpf: Add usdt trigger bench
On Thu, Nov 14, 2024 at 03:40:53PM -0800, Andrii Nakryiko wrote:
> On Tue, Nov 5, 2024 at 5:35 AM Jiri Olsa <jolsa@...nel.org> wrote:
> >
> > Adding usdt trigger bench to meassure optimized usdt probes.
> >
> > Signed-off-by: Jiri Olsa <jolsa@...nel.org>
> > ---
> > tools/testing/selftests/bpf/bench.c | 2 +
> > .../selftests/bpf/benchs/bench_trigger.c | 45 +++++++++++++++++++
> > .../selftests/bpf/progs/trigger_bench.c | 10 ++++-
> > 3 files changed, 56 insertions(+), 1 deletion(-)
> >
>
> Why not just adding uprobe-nop5 benchmark instead of going all the way
> into USDT? Seems simpler and will benchmark all the same stuff?
ok, perhaps with your new usdt library and the possible nop/nop5 tricks we
might want to have specific usdt benchmarks.. but that's for later anyway
jirka
>
> > diff --git a/tools/testing/selftests/bpf/bench.c b/tools/testing/selftests/bpf/bench.c
> > index 1bd403a5ef7b..dc5121e49623 100644
> > --- a/tools/testing/selftests/bpf/bench.c
> > +++ b/tools/testing/selftests/bpf/bench.c
> > @@ -526,6 +526,7 @@ extern const struct bench bench_trig_uprobe_multi_push;
> > extern const struct bench bench_trig_uretprobe_multi_push;
> > extern const struct bench bench_trig_uprobe_multi_ret;
> > extern const struct bench bench_trig_uretprobe_multi_ret;
> > +extern const struct bench bench_trig_usdt;
> >
> > extern const struct bench bench_rb_libbpf;
> > extern const struct bench bench_rb_custom;
> > @@ -586,6 +587,7 @@ static const struct bench *benchs[] = {
> > &bench_trig_uretprobe_multi_push,
> > &bench_trig_uprobe_multi_ret,
> > &bench_trig_uretprobe_multi_ret,
> > + &bench_trig_usdt,
> > /* ringbuf/perfbuf benchmarks */
> > &bench_rb_libbpf,
> > &bench_rb_custom,
> > diff --git a/tools/testing/selftests/bpf/benchs/bench_trigger.c b/tools/testing/selftests/bpf/benchs/bench_trigger.c
> > index 32e9f194d449..bdee8b8362d0 100644
> > --- a/tools/testing/selftests/bpf/benchs/bench_trigger.c
> > +++ b/tools/testing/selftests/bpf/benchs/bench_trigger.c
> > @@ -8,6 +8,7 @@
> > #include "bench.h"
> > #include "trigger_bench.skel.h"
> > #include "trace_helpers.h"
> > +#include "../sdt.h"
> >
> > #define MAX_TRIG_BATCH_ITERS 1000
> >
> > @@ -333,6 +334,13 @@ static void *uprobe_producer_ret(void *input)
> > return NULL;
> > }
> >
> > +static void *uprobe_producer_usdt(void *input)
> > +{
> > + while (true)
> > + STAP_PROBE(trigger, usdt);
> > + return NULL;
> > +}
> > +
> > static void usetup(bool use_retprobe, bool use_multi, void *target_addr)
> > {
> > size_t uprobe_offset;
> > @@ -383,6 +391,37 @@ static void usetup(bool use_retprobe, bool use_multi, void *target_addr)
> > }
> > }
> >
> > +static void __usdt_setup(const char *provider, const char *name)
> > +{
> > + struct bpf_link *link;
> > + int err;
> > +
> > + setup_libbpf();
> > +
> > + ctx.skel = trigger_bench__open();
> > + if (!ctx.skel) {
> > + fprintf(stderr, "failed to open skeleton\n");
> > + exit(1);
> > + }
> > +
> > + bpf_program__set_autoload(ctx.skel->progs.bench_trigger_usdt, true);
> > +
> > + err = trigger_bench__load(ctx.skel);
> > + if (err) {
> > + fprintf(stderr, "failed to load skeleton\n");
> > + exit(1);
> > + }
> > +
> > + link = bpf_program__attach_usdt(ctx.skel->progs.bench_trigger_usdt,
> > + -1 /* all PIDs */, "/proc/self/exe",
> > + provider, name, NULL);
> > + if (!link) {
> > + fprintf(stderr, "failed to attach uprobe!\n");
> > + exit(1);
> > + }
> > + ctx.skel->links.bench_trigger_usdt = link;
> > +}
> > +
> > static void usermode_count_setup(void)
> > {
> > ctx.usermode_counters = true;
> > @@ -448,6 +487,11 @@ static void uretprobe_multi_ret_setup(void)
> > usetup(true, true /* use_multi */, &uprobe_target_ret);
> > }
> >
> > +static void usdt_setup(void)
> > +{
> > + __usdt_setup("trigger", "usdt");
> > +}
> > +
> > const struct bench bench_trig_syscall_count = {
> > .name = "trig-syscall-count",
> > .validate = trigger_validate,
> > @@ -506,3 +550,4 @@ BENCH_TRIG_USERMODE(uprobe_multi_ret, ret, "uprobe-multi-ret");
> > BENCH_TRIG_USERMODE(uretprobe_multi_nop, nop, "uretprobe-multi-nop");
> > BENCH_TRIG_USERMODE(uretprobe_multi_push, push, "uretprobe-multi-push");
> > BENCH_TRIG_USERMODE(uretprobe_multi_ret, ret, "uretprobe-multi-ret");
> > +BENCH_TRIG_USERMODE(usdt, usdt, "usdt");
> > diff --git a/tools/testing/selftests/bpf/progs/trigger_bench.c b/tools/testing/selftests/bpf/progs/trigger_bench.c
> > index 044a6d78923e..7b7d4a71e7d4 100644
> > --- a/tools/testing/selftests/bpf/progs/trigger_bench.c
> > +++ b/tools/testing/selftests/bpf/progs/trigger_bench.c
> > @@ -1,8 +1,9 @@
> > // SPDX-License-Identifier: GPL-2.0
> > // Copyright (c) 2020 Facebook
> > -#include <linux/bpf.h>
> > +#include "vmlinux.h"
> > #include <asm/unistd.h>
> > #include <bpf/bpf_helpers.h>
> > +#include <bpf/usdt.bpf.h>
> > #include <bpf/bpf_tracing.h>
> > #include "bpf_misc.h"
> >
> > @@ -138,3 +139,10 @@ int bench_trigger_rawtp(void *ctx)
> > inc_counter();
> > return 0;
> > }
> > +
> > +SEC("?usdt")
> > +int bench_trigger_usdt(struct pt_regs *ctx)
> > +{
> > + inc_counter();
> > + return 0;
> > +}
> > --
> > 2.47.0
> >
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