linux-kernel - Re: [PATCH RFC 00/15] decouple pagefault_disable() from preempt

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Message-ID: <20150507114021.GH23123@twins.programming.kicks-ass.net>
Date:	Thu, 7 May 2015 13:40:21 +0200
From:	Peter Zijlstra <peterz@...radead.org>
To:	Ingo Molnar <mingo@...nel.org>
Cc:	Christian Borntraeger <borntraeger@...ibm.com>,
	Andrew Morton <akpm@...ux-foundation.org>,
	David Hildenbrand <dahi@...ux.vnet.ibm.com>,
	linux-kernel@...r.kernel.org, mingo@...hat.com,
	yang.shi@...driver.com, bigeasy@...utronix.de,
	benh@...nel.crashing.org, paulus@...ba.org,
	heiko.carstens@...ibm.com, schwidefsky@...ibm.com, mst@...hat.com,
	tglx@...utronix.de, David.Laight@...LAB.COM, hughd@...gle.com,
	hocko@...e.cz, ralf@...ux-mips.org, herbert@...dor.apana.org.au,
	linux@....linux.org.uk, airlied@...ux.ie, daniel.vetter@...el.com,
	linux-mm@...ck.org, linux-arch@...r.kernel.org
Subject: Re: [PATCH RFC 00/15] decouple pagefault_disable() from
 preempt_disable()

On Thu, May 07, 2015 at 01:08:28PM +0200, Ingo Molnar wrote:
> Yes, but I'm wondering what I'm missing: is there any deep reason for 
> making pagefaults-disabled sections non-atomic?

This all comes from -rt, where we had significant latencies due to these
things.
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