linux-kernel - Re: [PATCH 1/2] perf: Move task_pt

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Message-ID: <20150105140754.GF29390@twins.programming.kicks-ass.net>
Date:	Mon, 5 Jan 2015 15:07:54 +0100
From:	Peter Zijlstra <peterz@...radead.org>
To:	Andy Lutomirski <luto@...capital.net>
Cc:	Jiri Olsa <jolsa@...hat.com>, Ingo Molnar <mingo@...hat.com>,
	秦承刚(承刚) 
	<chenggang.qcg@...baba-inc.com>,
	Stephane Eranian <eranian@...gle.com>,
	root <chenggang.qin@...il.com>,
	Andrew Morton <akpm@...ux-foundation.org>,
	秦承刚(承刚) <chenggang.qcg@...bao.com>,
	Wu Fengguang <fengguang.wu@...el.com>,
	Namhyung Kim <namhyung@...il.com>,
	Mike Galbraith <efault@....de>,
	Arjan van de Ven <arjan@...ux.intel.com>,
	linux-kernel <linux-kernel@...r.kernel.org>,
	David Ahern <dsahern@...il.com>,
	Paul Mackerras <paulus@...ba.org>,
	Yanmin Zhang <yanmin.zhang@...el.com>
Subject: Re: [PATCH 1/2] perf: Move task_pt_regs sampling into arch code

On Sun, Jan 04, 2015 at 10:36:19AM -0800, Andy Lutomirski wrote:
> On x86_64, at least, task_pt_regs may be only partially initialized
> in many contexts, so x86_64 should not use it without extra care
> from interrupt context, let alone NMI context.
> 
> This will allow x86_64 to override the logic and will supply some
> scratch space to use to make a cleaner copy of user regs.

Just wondering how bad it would be to fill out the actual pt_regs that
was previously partially initialized?
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