linux-kernel - Re: [PATCH bpf-next 0/3] uprobes: two common case speed ups

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Date: Wed, 13 Mar 2024 10:33:28 -0700
From: Andrii Nakryiko <andrii.nakryiko@...il.com>
To: Jiri Olsa <olsajiri@...il.com>
Cc: Andrii Nakryiko <andrii@...nel.org>, linux-trace-kernel@...r.kernel.org, 
	rostedt@...dmis.org, mhiramat@...nel.org, bpf@...r.kernel.org, 
	mathieu.desnoyers@...icios.com, linux-kernel@...r.kernel.org, oleg@...hat.com
Subject: Re: [PATCH bpf-next 0/3] uprobes: two common case speed ups

On Wed, Mar 13, 2024 at 2:41 AM Jiri Olsa <olsajiri@...il.com> wrote:
>
> On Tue, Mar 12, 2024 at 02:02:30PM -0700, Andrii Nakryiko wrote:
> > This patch set implements two speed ups for uprobe/uretprobe runtime execution
> > path for some common scenarios: BPF-only uprobes (patches #1 and #2) and
> > system-wide (non-PID-specific) uprobes (patch #3). Please see individual
> > patches for details.
> >
> > Given I haven't worked with uprobe code before, I'm unfamiliar with
> > conventions in this subsystem, including which kernel tree patches should be
> > sent to. For now I based all the changes on top of bpf-next/master, which is
> > where I tested and benchmarked everything anyways. Please advise what should
> > I use as a base for subsequent revision. Thanks.

Steven, Masami,

Is this the kind of patches that should go through your tree(s)? Or
you'd be fine with this going through bpf-next? I'd appreciate the
link to the specific GIT repo I should use as a base in the former
case, thank you!

> >
> > Andrii Nakryiko (3):
> >   uprobes: encapsulate preparation of uprobe args buffer
> >   uprobes: prepare uprobe args buffer lazily
> >   uprobes: add speculative lockless system-wide uprobe filter check
>
> nice cleanup and speed up, lgtm
>
> Reviewed-by: Jiri Olsa <jolsa@...nel.org>
>
> jirka
>
> >
> >  kernel/trace/trace_uprobe.c | 103 ++++++++++++++++++++++--------------
> >  1 file changed, 63 insertions(+), 40 deletions(-)
> >
> > --
> > 2.43.0
> >
> >