linux-kernel - Re: [PATCH 1/3] mm: add comment for __mod_zone_page

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Message-ID: <alpine.DEB.2.10.1405121106080.17673@gentwo.org>
Date:	Mon, 12 May 2014 11:07:12 -0500 (CDT)
From:	Christoph Lameter <cl@...ux.com>
To:	Jianyu Zhan <nasa4836@...il.com>
cc:	Andrew Morton <akpm@...ux-foundation.org>,
	Hugh Dickins <hughd@...gle.com>,
	Rik van Riel <riel@...hat.com>, Mel Gorman <mgorman@...e.de>,
	Zhang Yanfei <zhangyanfei@...fujitsu.com>,
	Andrea Arcangeli <aarcange@...hat.com>, fabf@...net.be,
	sasha.levin@...cle.com, oleg@...hat.com,
	Naoya Horiguchi <n-horiguchi@...jp.nec.com>,
	iamjoonsoo.kim@....com, kirill.shutemov@...ux.intel.com,
	Cyrill Gorcunov <gorcunov@...il.com>,
	dave.hansen@...ux.intel.com, toshi.kani@...com,
	paul.gortmaker@...driver.com, srivatsa.bhat@...ux.vnet.ibm.com,
	"linux-mm@...ck.org" <linux-mm@...ck.org>,
	LKML <linux-kernel@...r.kernel.org>
Subject: Re: [PATCH 1/3] mm: add comment for __mod_zone_page_stat

On Mon, 12 May 2014, Jianyu Zhan wrote:

> This means they guarantee that even they are preemted the vm
> counter won't be modified incorrectly.  Because the counter is page-related
> (e.g., a new anon page added), and they are exclusively hold the pte lock.

Ok. if these locations hold the pte lock then preemption is disabled and
you are ok to use __mod_zone_page_state. Has nothing to do with the page.
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