linux-kernel - Re: [PATCH 1/1] mm: Prevent dereferencing non-allocated per

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Message-ID: <Pine.LNX.4.64.0711271609440.7293@schroedinger.engr.sgi.com>
Date:	Tue, 27 Nov 2007 16:15:44 -0800 (PST)
From:	Christoph Lameter <clameter@....com>
To:	Andi Kleen <andi@...stfloor.org>
cc:	Andrew Morton <akpm@...ux-foundation.org>, travis@....com,
	ak@...e.de, pageexec@...email.hu, linux-mm@...ck.org,
	linux-kernel@...r.kernel.org
Subject: Re: [PATCH 1/1] mm: Prevent dereferencing non-allocated per_cpu
 variables

On Wed, 28 Nov 2007, Andi Kleen wrote:

> It was demonstrated useful for some specific cases, like context switch early
> fetch on IA64. But I agree the prefetch on each list_for_each() is probably
> a bad idea and should be removed. Will also help code size.

Looks like sum_vm_events() is only ever called from all_vm_events(). 
Callers of all_vm_events():

App monitoring?
arch/s390/appldata/appldata_mem.c:      all_vm_events(ev);

Leds:
drivers/parisc/led.c:   all_vm_events(events);

proc out put for /proc/vmstat:
mm/vmstat.c:    all_vm_events(e);

All of that does not seem to be performance critical 
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