linux-kernel - Re: [PATCH v17 11/16] fprobe: Rewrite fprobe on function-graph tracer

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Message-Id: <20241022180048.989a3470b23ed34d048b246a@kernel.org>
Date: Tue, 22 Oct 2024 18:00:48 +0900
From: Masami Hiramatsu (Google) <mhiramat@...nel.org>
To: Heiko Carstens <hca@...ux.ibm.com>
Cc: Steven Rostedt <rostedt@...dmis.org>, Sven Schnelle
 <svens@...ux.ibm.com>, Alexei Starovoitov <alexei.starovoitov@...il.com>,
 Florent Revest <revest@...omium.org>, linux-trace-kernel@...r.kernel.org,
 LKML <linux-kernel@...r.kernel.org>, Martin KaFai Lau
 <martin.lau@...ux.dev>, bpf <bpf@...r.kernel.org>, Alexei Starovoitov
 <ast@...nel.org>, Jiri Olsa <jolsa@...nel.org>, Alan Maguire
 <alan.maguire@...cle.com>, Mark Rutland <mark.rutland@....com>,
 linux-arch@...r.kernel.org, Catalin Marinas <catalin.marinas@....com>, Will
 Deacon <will@...nel.org>, Huacai Chen <chenhuacai@...nel.org>, WANG Xuerui
 <kernel@...0n.name>, Michael Ellerman <mpe@...erman.id.au>, Nicholas Piggin
 <npiggin@...il.com>, Christophe Leroy <christophe.leroy@...roup.eu>, Naveen
 N Rao <naveen@...nel.org>, Madhavan Srinivasan <maddy@...ux.ibm.com>, Paul
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 Albert Ou <aou@...s.berkeley.edu>, Vasily Gorbik <gor@...ux.ibm.com>,
 Alexander Gordeev <agordeev@...ux.ibm.com>, Christian Borntraeger
 <borntraeger@...ux.ibm.com>, Thomas Gleixner <tglx@...utronix.de>, Ingo
 Molnar <mingo@...hat.com>, Borislav Petkov <bp@...en8.de>, Dave Hansen
 <dave.hansen@...ux.intel.com>, x86@...nel.org, "H. Peter Anvin"
 <hpa@...or.com>, Mathieu Desnoyers <mathieu.desnoyers@...icios.com>, Andrew
 Morton <akpm@...ux-foundation.org>
Subject: Re: [PATCH v17 11/16] fprobe: Rewrite fprobe on function-graph
 tracer

On Mon, 21 Oct 2024 18:31:39 +0200
Heiko Carstens <hca@...ux.ibm.com> wrote:

> > > Please note that this only works for addresses in the kernel address
> > > space. For user space the full 64 bit address range (minus the top
> > > page) can be used for user space applications.
> > 
> > I wonder what is the unsigned long size (stack entry size) of the
> > s390? is it 64bit?
> 
> The s390 kernel is 64 bit only. So unsigned long is 64 bit as well.
> 

Ah, got it.

> > > I'm just writing this
> > > here, just in case something like this comes up for uprobes or
> > > something similar as well.
> > 
> > I'm considering another solution if it doesn't work. Of course if
> > above works, it is the best compression ratio.
> 
> I'm think we are not talking about uprobes here, and everything ftrace
> related would just work (tm) with the first four MSBs assumed to be
> zero.

yeah, but we still have other 32bit architectures support (e.g. i386, arm).

Thank you,

-- 
Masami Hiramatsu (Google) <mhiramat@...nel.org>