From: Steven Rostedt <rostedt@goodmis.org>
To: "Masami Hiramatsu (Google)" <mhiramat@kernel.org>
Cc: Alexei Starovoitov <alexei.starovoitov@gmail.com>,
Florent Revest <revest@chromium.org>,
linux-trace-kernel@vger.kernel.org,
LKML <linux-kernel@vger.kernel.org>,
Martin KaFai Lau <martin.lau@linux.dev>,
bpf <bpf@vger.kernel.org>, Sven Schnelle <svens@linux.ibm.com>,
Alexei Starovoitov <ast@kernel.org>, Jiri Olsa <jolsa@kernel.org>,
Arnaldo Carvalho de Melo <acme@kernel.org>,
Daniel Borkmann <daniel@iogearbox.net>,
Alan Maguire <alan.maguire@oracle.com>,
Mark Rutland <mark.rutland@arm.com>,
Peter Zijlstra <peterz@infradead.org>,
Thomas Gleixner <tglx@linutronix.de>, Guo Ren <guoren@kernel.org>,
linux-arch@vger.kernel.org
Subject: Re: [PATCH v14 19/19] fgraph: Skip recording calltime/rettime if it is not nneeded
Date: Sat, 14 Sep 2024 17:53:23 -0400 [thread overview]
Message-ID: <20240914175323.16206416@rorschach.local.home> (raw)
In-Reply-To: <172615389864.133222.14452329708227900626.stgit@devnote2>
On Fri, 13 Sep 2024 00:11:38 +0900
"Masami Hiramatsu (Google)" <mhiramat@kernel.org> wrote:
> From: Masami Hiramatsu (Google) <mhiramat@kernel.org>
>
> Skip recording calltime and rettime if the fgraph_ops does not need it.
> This is a kind of performance optimization for fprobe. Since the fprobe
> user does not use these entries, recording timestamp in fgraph is just
> a overhead (e.g. eBPF, ftrace). So introduce the skip_timestamp flag,
> and all fgraph_ops sets this flag, skip recording calltime and rettime.
>
> Here is the performance results measured by
> tools/testing/selftests/bpf/benchs/run_bench_trigger.sh
>
> Without this:
> kprobe-multi : 5.700 ± 0.065M/s
> kretprobe-multi: 4.239 ± 0.006M/s
>
> With skip-timestamp:
> kprobe-multi : 6.265 ± 0.033M/s +9.91%
> kretprobe-multi: 4.758 ± 0.009M/s +12.24%
>
> Suggested-by: Jiri Olsa <olsajiri@gmail.com>
> Signed-off-by: Masami Hiramatsu (Google) <mhiramat@kernel.org>
Can you try this series instead:
https://lore.kernel.org/all/20240914214805.779822616@goodmis.org/
I rather get rid of the calltime completely from the generic logic, and
that series does just that.
That series only replaces this patch and can be applied before this
series (or after).
-- Steve
next prev parent reply other threads:[~2024-09-14 21:53 UTC|newest]
Thread overview: 31+ messages / expand[flat|nested] mbox.gz Atom feed top
2024-09-12 15:08 [PATCH v14 00/19] tracing: fprobe: function_graph: Multi-function graph and fprobe on fgraph Masami Hiramatsu (Google)
2024-09-12 15:08 ` [PATCH v14 01/19] tracing: Add a comment about ftrace_regs definition Masami Hiramatsu (Google)
2024-09-12 15:08 ` [PATCH v14 02/19] tracing: Rename ftrace_regs_return_value to ftrace_regs_get_return_value Masami Hiramatsu (Google)
2024-09-12 15:08 ` [PATCH v14 03/19] function_graph: Pass ftrace_regs to entryfunc Masami Hiramatsu (Google)
2024-09-12 15:08 ` [PATCH v14 04/19] function_graph: Replace fgraph_ret_regs with ftrace_regs Masami Hiramatsu (Google)
2024-09-12 15:09 ` [PATCH v14 05/19] function_graph: Pass ftrace_regs to retfunc Masami Hiramatsu (Google)
2024-09-12 15:09 ` [PATCH v14 06/19] fprobe: Use ftrace_regs in fprobe entry handler Masami Hiramatsu (Google)
2024-09-12 15:09 ` [PATCH v14 07/19] fprobe: Use ftrace_regs in fprobe exit handler Masami Hiramatsu (Google)
2024-09-12 15:09 ` [PATCH v14 08/19] tracing: Add ftrace_partial_regs() for converting ftrace_regs to pt_regs Masami Hiramatsu (Google)
2024-09-12 15:09 ` [PATCH v14 09/19] tracing: Add ftrace_fill_perf_regs() for perf event Masami Hiramatsu (Google)
2024-09-12 15:09 ` [PATCH v14 10/19] tracing/fprobe: Enable fprobe events with CONFIG_DYNAMIC_FTRACE_WITH_ARGS Masami Hiramatsu (Google)
2024-09-12 15:10 ` [PATCH v14 11/19] bpf: Enable kprobe_multi feature if CONFIG_FPROBE is enabled Masami Hiramatsu (Google)
2024-09-12 15:10 ` [PATCH v14 12/19] ftrace: Add CONFIG_HAVE_FTRACE_GRAPH_FUNC Masami Hiramatsu (Google)
2024-09-12 15:10 ` [PATCH v14 13/19] fprobe: Rewrite fprobe on function-graph tracer Masami Hiramatsu (Google)
2024-09-12 15:10 ` [PATCH v14 14/19] tracing: Fix function timing profiler to initialize hashtable Masami Hiramatsu (Google)
2024-09-12 15:10 ` [PATCH v14 15/19] tracing/fprobe: Remove nr_maxactive from fprobe Masami Hiramatsu (Google)
2024-09-12 15:11 ` [PATCH v14 16/19] selftests: ftrace: Remove obsolate maxactive syntax check Masami Hiramatsu (Google)
2024-09-12 15:11 ` [PATCH v14 17/19] selftests/ftrace: Add a test case for repeating register/unregister fprobe Masami Hiramatsu (Google)
2024-09-12 15:11 ` [PATCH v14 18/19] Documentation: probes: Update fprobe on function-graph tracer Masami Hiramatsu (Google)
2024-09-12 15:11 ` [PATCH v14 19/19] fgraph: Skip recording calltime/rettime if it is not nneeded Masami Hiramatsu (Google)
2024-09-14 21:53 ` Steven Rostedt [this message]
[not found] ` <0170cd7d95df0583770c385c1e11bd27dfacf618b71b6e723f0952efc0ce9040@mail.kernel.org>
2024-09-12 18:41 ` [PATCH v14 00/19] tracing: fprobe: function_graph: Multi-function graph and fprobe on fgraph Andrii Nakryiko
2024-09-12 23:54 ` Masami Hiramatsu
2024-09-13 1:55 ` Andrii Nakryiko
2024-09-13 8:59 ` Masami Hiramatsu
2024-09-13 12:45 ` Masami Hiramatsu
2024-09-13 13:49 ` Masami Hiramatsu
2024-09-13 21:23 ` Andrii Nakryiko
2024-09-14 2:10 ` Masami Hiramatsu
2024-09-13 21:16 ` Andrii Nakryiko
2024-09-14 1:58 ` Masami Hiramatsu
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