linux-kernel - Re: [External] Re: [PATCH bpf-next 0/5] bpf: make tracing program support multi-attach

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Date: Wed, 21 Feb 2024 10:45:47 +0800
From: 梦龙董 <dongmenglong.8@...edance.com>
To: Alexei Starovoitov <alexei.starovoitov@...il.com>
Cc: Andrii Nakryiko <andrii@...nel.org>, Alexei Starovoitov <ast@...nel.org>, 
	Daniel Borkmann <daniel@...earbox.net>, Martin KaFai Lau <martin.lau@...ux.dev>, Eddy Z <eddyz87@...il.com>, 
	Song Liu <song@...nel.org>, Yonghong Song <yonghong.song@...ux.dev>, 
	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>, 
	Mykola Lysenko <mykolal@...com>, Shuah Khan <shuah@...nel.org>, mcoquelin.stm32@...il.com, 
	alexandre.torgue@...s.st.com, Kui-Feng Lee <thinker.li@...il.com>, 
	Feng Zhou <zhoufeng.zf@...edance.com>, Dave Marchevsky <davemarchevsky@...com>, 
	Daniel Xu <dxu@...uu.xyz>, LKML <linux-kernel@...r.kernel.org>, bpf <bpf@...r.kernel.org>, 
	"open list:KERNEL SELFTEST FRAMEWORK" <linux-kselftest@...r.kernel.org>, linux-stm32@...md-mailman.stormreply.com, 
	linux-arm-kernel <linux-arm-kernel@...ts.infradead.org>
Subject: Re: [External] Re: [PATCH bpf-next 0/5] bpf: make tracing program
 support multi-attach

On Wed, Feb 21, 2024 at 10:35 AM 梦龙董 <dongmenglong.8@...edance.com> wrote:
>
> Hello,
>
> On Wed, Feb 21, 2024 at 9:24 AM Alexei Starovoitov
> <alexei.starovoitov@...il.com> wrote:
> >
> > On Mon, Feb 19, 2024 at 7:51 PM Menglong Dong
> > <dongmenglong.8@...edance.com> wrote:
> > >
> > > For now, the BPF program of type BPF_PROG_TYPE_TRACING is not allowed to
> > > be attached to multiple hooks, and we have to create a BPF program for
> > > each kernel function, for which we want to trace, even through all the
> > > program have the same (or similar) logic. This can consume extra memory,
> > > and make the program loading slow if we have plenty of kernel function to
> > > trace.
> >
> > Should this be combined with multi link ?
> > (As was recently done for kprobe_multi and uprobe_multi).
> > Loading fentry prog once and attaching it through many bpf_links
> > to multiple places is a nice addition,
> > but we should probably add a multi link right away too.
>
> I was planning to implement the multi link for tracing after this
> series in another series. I can do it together with this series
> if you prefer.
>

Should I introduce the multi link for tracing first, then this series?
(Furthermore, this series seems not necessary.)

> Thanks!
> Menglong Dong