linux-kernel - Re: [PATCH 0/1] uprobes/perf: Avoid perf_trace_buf_prepare/submit if ->perf

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Date:	Sat, 13 Apr 2013 20:22:59 +0200
From:	Oleg Nesterov <oleg@...hat.com>
To:	Steven Rostedt <rostedt@...dmis.org>
Cc:	Masami Hiramatsu <masami.hiramatsu.pt@...achi.com>,
	Srikar Dronamraju <srikar@...ux.vnet.ibm.com>,
	Ananth N Mavinakayanahalli <ananth@...ibm.com>,
	Anton Arapov <anton@...hat.com>,
	Frederic Weisbecker <fweisbec@...il.com>,
	Ingo Molnar <mingo@...hat.com>, linux-kernel@...r.kernel.org,
	"yrl.pp-manager.tt@...achi.com" <yrl.pp-manager.tt@...achi.com>
Subject: Re: [PATCH 0/1] uprobes/perf: Avoid perf_trace_buf_prepare/submit
	if ->perf_events is empty

On 04/13, Oleg Nesterov wrote:
>
> On 04/12, Steven Rostedt wrote:
> >
> > Can you make the necessary changes elsewhere? I talked with Frederic on
> > IRC and he's a bit busy with other work. But he did say he would review
> > changes that you make.
>
> Sure, will be happy to do.

Everything looks trivial except DECLARE_EVENT_CLASS()->perf_trace_*() which
should also check __task != NULL.

In fact this _looks_ simple too, we could move TP_perf_assign() logic into
TP_ARGS(), but probably this is too ugly. I'll try think more.

Oleg.

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