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

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Message-ID: <CAFiDJ59Y9y4VrcVfyo8rrQV-NtM=1G=kQScBtEvnuC3MpXt0KA@mail.gmail.com>
Date:	Mon, 15 Dec 2014 18:07:56 +0800
From:	"LF.Tan" <lftan.linux@...il.com>
To:	David Hildenbrand <dahi@...ux.vnet.ibm.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).
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