linux-kernel - Re: [PATCH] x86/tracing: introduce enter/exit tracepoint pairs for page faults

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Message-ID: <41e7d947-d59f-41a9-a540-d3c07e4678c4@cs.wisc.edu>
Date: Mon, 14 Apr 2025 18:22:23 -0500
From: Junxuan Liao <ljx@...wisc.edu>
To: Dave Hansen <dave.hansen@...el.com>, linux-trace-kernel@...r.kernel.org,
        linux-kernel@...r.kernel.org, x86@...nel.org
Cc: Thomas Gleixner <tglx@...utronix.de>, Ingo Molnar <mingo@...hat.com>,
        Borislav Petkov <bp@...en8.de>,
        Dave Hansen <dave.hansen@...ux.intel.com>,
        "H. Peter Anvin" <hpa@...or.com>, Steven Rostedt <rostedt@...dmis.org>,
        Masami Hiramatsu <mhiramat@...nel.org>,
        Mathieu Desnoyers <mathieu.desnoyers@...icios.com>,
        "Paul E. McKenney" <paulmck@...nel.org>
Subject: Re: [PATCH] x86/tracing: introduce enter/exit tracepoint pairs for
 page faults

On 4/14/25 6:14 PM, Junxuan Liao wrote:
> Do people find separate user/kernel tracepoints useful? For me, I can
> check regs in eBPF tracing code instead.

I think it might be good to add a field to the tracepoints to indicate
whether it's in user space or not.