linux-kernel - Re: [PATCH 0/3] ARM 4Kstacks: introduction

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Date:	Sat, 22 Oct 2011 16:27:18 +0200
From:	"Andi Kleen" <andi@...stfloor.org>
To:	"Måns Rullgård" <mans@...sr.com>
Cc:	"Ming Lei" <tom.leiming@...il.com>,
	"Arnd Bergmann" <arnd@...db.de>,
	linux-arm-kernel@...ts.infradead.org,
	"Tim Bird" <tim.bird@...sony.com>, "Joe Perches" <joe@...ches.com>,
	"linux kernel" <linux-kernel@...r.kernel.org>,
	"Andi Kleen" <andi@...stfloor.org>,
	"Russell King" <rmk@....linux.org.uk>,
	"Thomas Gleixner" <tglx@...utronix.de>
Subject: Re: [PATCH 0/3] ARM 4Kstacks: introduction


>> If system run for some time, sometimes it may be difficult for
>> memory allocator to allocate 2 continuous page frames even  there are
>> many spare page frames in system because of
>> fragment issue, so the patch does make sense. Anyway,
>> it provides one option for user to apply 4k stack to avoid
>> such kind of process creation failure.
>
> Can't page migration be used in these situations?

The kernel already uses it of course, assuming the pages are movable.
So if you are really worried about this, just define a movable zone.

-Andi

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