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

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Message-ID: <20241021163139.6950-F-hca@linux.ibm.com>
Date: Mon, 21 Oct 2024 18:31:39 +0200
From: Heiko Carstens <hca@...ux.ibm.com>
To: Masami Hiramatsu <mhiramat@...nel.org>
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 Walmsley <paul.walmsley@...ive.com>,
        Palmer Dabbelt <palmer@...belt.com>, 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

> > 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.

> > 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.