linux-kernel - Re: [RFC perf/core 05/11] uprobes: Add mapping for optimized uprobe trampolines

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Message-ID: <20241105142327.GF10375@noisy.programming.kicks-ass.net>
Date: Tue, 5 Nov 2024 15:23:27 +0100
From: Peter Zijlstra <peterz@...radead.org>
To: Jiri Olsa <jolsa@...nel.org>
Cc: Oleg Nesterov <oleg@...hat.com>, Andrii Nakryiko <andrii@...nel.org>,
	bpf@...r.kernel.org, Song Liu <songliubraving@...com>,
	Yonghong Song <yhs@...com>,
	John Fastabend <john.fastabend@...il.com>,
	Hao Luo <haoluo@...gle.com>, Steven Rostedt <rostedt@...dmis.org>,
	Masami Hiramatsu <mhiramat@...nel.org>,
	Alan Maguire <alan.maguire@...cle.com>,
	linux-kernel@...r.kernel.org, linux-trace-kernel@...r.kernel.org
Subject: Re: [RFC perf/core 05/11] uprobes: Add mapping for optimized uprobe
 trampolines

On Tue, Nov 05, 2024 at 02:33:59PM +0100, Jiri Olsa wrote:
> Adding interface to add special mapping for user space page that will be
> used as place holder for uprobe trampoline in following changes.
> 
> The get_tramp_area(vaddr) function either finds 'callable' page or create
> new one.  The 'callable' means it's reachable by call instruction (from
> vaddr argument) and is decided by each arch via new arch_uprobe_is_callable
> function.
> 
> The put_tramp_area function either drops refcount or destroys the special
> mapping and all the maps are clean up when the process goes down.

In another thread somewhere, Andrii mentioned that Meta has executables
with more than 4G of .text. This isn't going to work for them, is it?