linux-kernel - Re: [PATCH v5 1/2] mm, vmstat: calculate particular vm event

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Message-ID: <alpine.DEB.2.20.1604071512060.16534@east.gentwo.org>
Date:	Thu, 7 Apr 2016 15:15:27 -0500 (CDT)
From:	Christoph Lameter <cl@...ux.com>
To:	Ebru Akagunduz <ebru.akagunduz@...il.com>
cc:	linux-mm@...ck.org, hughd@...gle.com, riel@...hat.com,
	akpm@...ux-foundation.org, kirill.shutemov@...ux.intel.com,
	n-horiguchi@...jp.nec.com, aarcange@...hat.com,
	iamjoonsoo.kim@....com, gorcunov@...nvz.org,
	linux-kernel@...r.kernel.org, mgorman@...e.de, rientjes@...gle.com,
	vbabka@...e.cz, aneesh.kumar@...ux.vnet.ibm.com,
	hannes@...xchg.org, mhocko@...e.cz, boaz@...xistor.com
Subject: Re: [PATCH v5 1/2] mm, vmstat: calculate particular vm event

On Thu, 7 Apr 2016, Ebru Akagunduz wrote:

> Currently, vmstat can calculate specific vm event with all_vm_events()
> however it allocates all vm events to stack. This patch introduces
> a helper to sum value of a specific vm event over all cpu, without
> loading all the events.

The first sentence is inaccurate. all_vm_events() takes a pointer to an
array of  of counters and does not allocate on the stack. Fix this and
then add

Acked-by: Christoph Lameter <cl@...ux.com>