linux-kernel - RE: [PATCH v13 3/3] trace,x86: Add irq vector tracepoints

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Message-ID: <A5ED84D3BB3A384992CBB9C77DEDA4D41B0113FE@USINDEM103.corp.hds.com>
Date:	Tue, 4 Jun 2013 18:37:03 +0000
From:	Seiji Aguchi <seiji.aguchi@....com>
To:	Steven Rostedt <rostedt@...dmis.org>,
	"H. Peter Anvin" <hpa@...or.com>
CC:	"linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
	"x86@...nel.org" <x86@...nel.org>,
	"tglx@...utronix.de" <tglx@...utronix.de>,
	"mingo@...e.hu" <mingo@...e.hu>, "bp@...en8.de" <bp@...en8.de>,
	"linux-edac@...r.kernel.org" <linux-edac@...r.kernel.org>,
	"tony.luck@...el.com" <tony.luck@...el.com>,
	"dle-develop@...ts.sourceforge.net" 
	<dle-develop@...ts.sourceforge.net>,
	Tomoki Sekiyama <tomoki.sekiyama@....com>
Subject: RE: [PATCH v13 3/3] trace,x86: Add irq vector tracepoints

> > The point is that the IDT address itself should not be mutable state if
> > it can be at all avoided.
> 
> Hmm, maybe we can do it. Have two counters, a debug_idt_ctr and a
> trace_idt_ctr, then have a function that basically does this:
> 
> 	if (this_cpu_read(debug_idt_ctr))
> 		load_idt(&nmi_idt_descr); /* probably should rename to debug_idt_descr) */
> 	else if (trace_idt_ctr)
> 		load_idt(&trace_idt_descr);
> 	else
> 		load_idt(&idt_descr);
> 
> Then all modifications of the idt would call this function.

I think it will work.
I will make the patch.

Seiji

> 
> -- Steve
> 
>