linux-kernel - Re: [PATCH v12 10/13] arch/x86: enable task isolation functionality

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Message-ID: <20160518171059.GN3193@twins.programming.kicks-ass.net>
Date:	Wed, 18 May 2016 19:10:59 +0200
From:	Peter Zijlstra <peterz@...radead.org>
To:	Chris Metcalf <cmetcalf@...lanox.com>
Cc:	Gilad Ben Yossef <giladb@...hip.com>,
	Steven Rostedt <rostedt@...dmis.org>,
	Ingo Molnar <mingo@...nel.org>,
	Andrew Morton <akpm@...ux-foundation.org>,
	Rik van Riel <riel@...hat.com>, Tejun Heo <tj@...nel.org>,
	Frederic Weisbecker <fweisbec@...il.com>,
	Thomas Gleixner <tglx@...utronix.de>,
	"Paul E. McKenney" <paulmck@...ux.vnet.ibm.com>,
	Christoph Lameter <cl@...ux.com>,
	Viresh Kumar <viresh.kumar@...aro.org>,
	Catalin Marinas <catalin.marinas@....com>,
	Will Deacon <will.deacon@....com>,
	Andy Lutomirski <luto@...capital.net>,
	"H. Peter Anvin" <hpa@...or.com>, x86@...nel.org,
	linux-kernel@...r.kernel.org
Subject: Re: [PATCH v12 10/13] arch/x86: enable task isolation functionality

On Wed, May 18, 2016 at 12:35:40PM -0400, Chris Metcalf wrote:
> On 5/18/2016 12:23 PM, Peter Zijlstra wrote:

> >
> >That seems to miss a whole bunch of exceptions... what up?
> 
> We only need to do an explicit call in the case where the exception does NOT
> result in a signal, since a signal is something that will be really obvious to
> the application in any case.  So it's just stuff like handled page faults,
> handled bounds checks for x86, handled unaligned load/store for tilegx, etc.

Right; as per your earlier signal explanation. This seems somewhat
fragile to maintain though and really could use more clarification.