linux-kernel - Re: [PATCH v4 0/3] task_work_add (was: task_work

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Message-ID: <20120414201748.GA8482@redhat.com>
Date:	Sat, 14 Apr 2012 22:17:48 +0200
From:	Oleg Nesterov <oleg@...hat.com>
To:	Peter Zijlstra <peterz@...radead.org>
Cc:	Andrew Morton <akpm@...ux-foundation.org>,
	David Howells <dhowells@...hat.com>,
	Linus Torvalds <torvalds@...ux-foundation.org>,
	Thomas Gleixner <tglx@...utronix.de>,
	Alexander Gordeev <agordeev@...hat.com>,
	Chris Zankel <chris@...kel.net>,
	David Smith <dsmith@...hat.com>,
	"Frank Ch. Eigler" <fche@...hat.com>,
	Geert Uytterhoeven <geert@...ux-m68k.org>,
	Larry Woodman <lwoodman@...hat.com>, Tejun Heo <tj@...nel.org>,
	linux-kernel@...r.kernel.org
Subject: Re: [PATCH v4 0/3] task_work_add (was: task_work_queue)

On 04/14, Peter Zijlstra wrote:
>
> Can you use this to get rid of TIF_UPROBE as well?

Yes, I thought about uprobes. May be it can use task_work, but
it is not easy to avoid TIF_UPROBE. The problem is the first
UTASK_BP_HIT when current->utask == NULL, and ->utask is the
only "right" place to hold task_work. We will see.

Oleg.

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