linux-kernel - Re: [RFC PATCH 10/11] mcount tracer show task comm and pid

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Message-ID: <20080106153758.GA27863@elte.hu>
Date:	Sun, 6 Jan 2008 16:37:58 +0100
From:	Ingo Molnar <mingo@...e.hu>
To:	Mathieu Desnoyers <mathieu.desnoyers@...ymtl.ca>
Cc:	Steven Rostedt <rostedt@...dmis.org>,
	LKML <linux-kernel@...r.kernel.org>,
	Linus Torvalds <torvalds@...ux-foundation.org>,
	Andrew Morton <akpm@...ux-foundation.org>,
	Peter Zijlstra <a.p.zijlstra@...llo.nl>,
	Christoph Hellwig <hch@...radead.org>,
	Gregory Haskins <ghaskins@...ell.com>,
	Arnaldo Carvalho de Melo <acme@...stprotocols.net>,
	"William L. Irwin" <sparclinux@...r.kernel.org>,
	Steven Rostedt <srostedt@...hat.com>
Subject: Re: [RFC PATCH 10/11] mcount tracer show task comm and pid


* Mathieu Desnoyers <mathieu.desnoyers@...ymtl.ca> wrote:

> > @@ -34,6 +34,7 @@ mctracer_add_trace_entry(struct mctracer
> >  {
> >  	unsigned long idx, idx_next;
> >  	struct mctracer_entry *entry;
> > +	struct task_struct *tsk = current;
> 
> Aren't there situations, like in the middle of a context switch, where 
> current is not valid ? Is also poses a problem for early boot, and NMI 
> tracing.

no such problems on x86.

	Ingo
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