linux-kernel - Re: [PATCH bpf-next v2 0/4] Add ftrace direct call for arm64

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Message-ID: <20221005110707.55bd9354@gandalf.local.home>
Date:   Wed, 5 Oct 2022 11:07:07 -0400
From:   Steven Rostedt <rostedt@...dmis.org>
To:     Xu Kuohai <xukuohai@...wei.com>
Cc:     Florent Revest <revest@...omium.org>,
        Mark Rutland <mark.rutland@....com>,
        Catalin Marinas <catalin.marinas@....com>,
        Daniel Borkmann <daniel@...earbox.net>,
        Xu Kuohai <xukuohai@...weicloud.com>,
        <linux-arm-kernel@...ts.infradead.org>,
        <linux-kernel@...r.kernel.org>, <bpf@...r.kernel.org>,
        Will Deacon <will@...nel.org>,
        Jean-Philippe Brucker <jean-philippe@...aro.org>,
        Ingo Molnar <mingo@...hat.com>,
        Oleg Nesterov <oleg@...hat.com>,
        Alexei Starovoitov <ast@...nel.org>,
        Andrii Nakryiko <andrii@...nel.org>,
        Martin KaFai Lau <martin.lau@...ux.dev>,
        Song Liu <song@...nel.org>, Yonghong Song <yhs@...com>,
        John Fastabend <john.fastabend@...il.com>,
        KP Singh <kpsingh@...nel.org>,
        Stanislav Fomichev <sdf@...gle.com>,
        Hao Luo <haoluo@...gle.com>, Jiri Olsa <jolsa@...nel.org>,
        Zi Shen Lim <zlim.lnx@...il.com>,
        Pasha Tatashin <pasha.tatashin@...een.com>,
        Ard Biesheuvel <ardb@...nel.org>,
        Marc Zyngier <maz@...nel.org>, Guo Ren <guoren@...nel.org>,
        Masami Hiramatsu <mhiramat@...nel.org>
Subject: Re: [PATCH bpf-next v2 0/4] Add ftrace direct call for arm64

On Wed, 5 Oct 2022 22:54:15 +0800
Xu Kuohai <xukuohai@...wei.com> wrote:

> 1.3 attach bpf prog with with direct call, bpftrace -e 'kfunc:vfs_write {}'
> 
> # dd if=/dev/zero of=/dev/null count=1000000
> 1000000+0 records in
> 1000000+0 records out
> 512000000 bytes (512 MB, 488 MiB) copied, 1.72973 s, 296 MB/s
> 
> 
> 1.4 attach bpf prog with with indirect call, bpftrace -e 'kfunc:vfs_write {}'
> 
> # dd if=/dev/zero of=/dev/null count=1000000
> 1000000+0 records in
> 1000000+0 records out
> 512000000 bytes (512 MB, 488 MiB) copied, 1.99179 s, 257 MB/s

Can you show the implementation of the indirect call you used?

Thanks,

-- Steve