linux-kernel - Re: [PATCH v2 1/5] uaccess: add pagefault_count to thread

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Message-ID: <20141215122301.0eac5f19@thinkpad-w530>
Date:	Mon, 15 Dec 2014 12:23:01 +0100
From:	David Hildenbrand <dahi@...ux.vnet.ibm.com>
To:	"LF.Tan" <lftan.linux@...il.com>
Cc:	"linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
	Linux-Arch <linux-arch@...r.kernel.org>,
	benh@...nel.crashing.org, paulus@...ba.org,
	akpm@...ux-foundation.org, heiko.carstens@...ibm.com,
	schwidefsky@...ibm.com, borntraeger@...ibm.com,
	"Michael S. Tsirkin" <mst@...hat.com>,
	Thomas Gleixner <tglx@...utronix.de>, David.Laight@...lab.com,
	peterz@...radead.org, hughd@...gle.com, hocko@...e.cz
Subject: Re: [PATCH v2 1/5] uaccess: add pagefault_count to thread_info

> On Wed, Dec 10, 2014 at 10:23 PM, David Hildenbrand
> <dahi@...ux.vnet.ibm.com> wrote:
> > This patch adds the pagefault_count to the thread_info of all
> > architectures. It will be used to count the pagefault_disable() levels
> > on a per-thread basis.
> >
> > We are not reusing the preempt_count as this is per cpu on x86 and we want to
> > demangle pagefault_disable() from preemption in the future.
> >
> > The new counter is added directly below the preempt_count, except for archs
> > relying on a manual calculation of asm offsets - to minimize the changes.
> >
> Hi David
> 
> Is this patchset targeted for 3.19? If yes, then we need this for
> arch/nios2 as well (new arch in 3.19).
> 

Hi,

Peter just showed my that there is some work ongoing on that
pagefault_disable() topic. So I am not sure if the arch-specific part of this
series is still relevant.

But thanks for the info!

David

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