linux-kernel - Re: [PATCH v2 7/11] Uprobes Implementation

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Message-ID: <1273611704.1810.136.camel@laptop>
Date:	Tue, 11 May 2010 23:01:44 +0200
From:	Peter Zijlstra <peterz@...radead.org>
To:	"Frank Ch. Eigler" <fche@...hat.com>
Cc:	Oleg Nesterov <oleg@...hat.com>,
	Srikar Dronamraju <srikar@...ux.vnet.ibm.com>,
	Ingo Molnar <mingo@...e.hu>,
	Andrew Morton <akpm@...ux-foundation.org>,
	Linus Torvalds <torvalds@...ux-foundation.org>,
	Masami Hiramatsu <mhiramat@...hat.com>,
	Randy Dunlap <rdunlap@...otime.net>,
	Ananth N Mavinakayanahalli <ananth@...ibm.com>,
	Jim Keniston <jkenisto@...ux.vnet.ibm.com>,
	Frederic Weisbecker <fweisbec@...il.com>,
	LKML <linux-kernel@...r.kernel.org>,
	Roland McGrath <roland@...hat.com>
Subject: Re: [PATCH v2 7/11] Uprobes Implementation

On Tue, 2010-05-11 at 16:57 -0400, Frank Ch. Eigler wrote:
> Hi -
> 
> On Tue, May 11, 2010 at 10:32:18PM +0200, Peter Zijlstra wrote:
> > [...]
> > Right so what I've suggested several times it to simply call the same
> > handler in both contexts. If it returns -EFAULT, set TIF_UPROBE or
> > whatever and try again from task context.
> 
> That could work, but random partial execution & restart of the handler
> will make it tricky to write a single handler that reliably produces
> results.  It would likely need a flag to indicate that it failed
> previously so as to throw away partial results.

Or it shouldn't leave half-assed state around to begin with.

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