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From: Peter Zijlstra <peterz@infradead.org>
To: Andy Lutomirski <luto@amacapital.net>
Cc: "Jiri Olsa" <jolsa@redhat.com>, "Ingo Molnar" <mingo@redhat.com>,
	"秦承刚(承刚)" <chenggang.qcg@alibaba-inc.com>,
	"Stephane Eranian" <eranian@google.com>,
	root <chenggang.qin@gmail.com>,
	"Andrew Morton" <akpm@linux-foundation.org>,
	"秦承刚(承刚)" <chenggang.qcg@taobao.com>,
	"Wu Fengguang" <fengguang.wu@intel.com>,
	"Namhyung Kim" <namhyung@gmail.com>,
	"Mike Galbraith" <efault@gmx.de>,
	"Arjan van de Ven" <arjan@linux.intel.com>,
	linux-kernel <linux-kernel@vger.kernel.org>,
	"David Ahern" <dsahern@gmail.com>,
	"Paul Mackerras" <paulus@samba.org>,
	"Yanmin Zhang" <yanmin.zhang@intel.com>
Subject: Re: [PATCH 1/2] perf: Move task_pt_regs sampling into arch code
Date: Mon, 5 Jan 2015 15:07:54 +0100	[thread overview]
Message-ID: <20150105140754.GF29390@twins.programming.kicks-ass.net> (raw)
In-Reply-To: <e431cd4c18c2e1c44c774f10758527fb2d1025c4.1420396372.git.luto@amacapital.net>

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?

  reply	other threads:[~2015-01-05 14:08 UTC|newest]

Thread overview: 23+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2014-12-23  6:22 [PATCH] perf core: Use KSTK_ESP() instead of pt_regs->sp while output user regs root
2014-12-23  8:30 ` Andy Lutomirski
     [not found] ` <c027bde0-5f4f-441f-8d45-3e7f6f702231@alibaba-inc.com>
2014-12-25 15:48   ` 答复：[PATCH] " Andy Lutomirski
2014-12-25 16:21     ` Andy Lutomirski
2014-12-30 19:03     ` Peter Zijlstra
2014-12-30 23:29       ` Andy Lutomirski
2014-12-31  2:00         ` Andy Lutomirski
2015-01-02 16:11           ` Jan Beulich
2015-01-02 18:03             ` Andy Lutomirski
2015-01-05  8:47               ` Jan Beulich
2015-01-04 16:10       ` Jiri Olsa
2015-01-04 17:18         ` Andy Lutomirski
2015-01-04 17:41           ` Jiri Olsa
2015-01-04 18:36             ` [PATCH 0/2] perf: Improve user regs sampling Andy Lutomirski
2015-01-04 18:36               ` [PATCH 1/2] perf: Move task_pt_regs sampling into arch code Andy Lutomirski
2015-01-05 14:07                 ` Peter Zijlstra [this message]
2015-01-05 16:13                   ` Andy Lutomirski
2015-01-05 16:44                     ` Peter Zijlstra
2015-01-05 18:28                       ` Andy Lutomirski
2015-01-09 12:32                 ` [tip:perf/urgent] " tip-bot for Andy Lutomirski
2015-01-04 18:36               ` [PATCH 2/2] x86_64, perf: Improve user regs sampling Andy Lutomirski
2015-01-09 12:32                 ` [tip:perf/urgent] perf/x86_64: " tip-bot for Andy Lutomirski
2015-01-05 10:46               ` [PATCH 0/2] perf: " Jiri Olsa

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