linux-kernel - Re: Why preallocate pmd in x86 32-bit PAE?

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Message-ID: <alpine.LFD.0.9999.0711161118160.4260@woody.linux-foundation.org>
Date:	Fri, 16 Nov 2007 11:22:10 -0800 (PST)
From:	Linus Torvalds <torvalds@...ux-foundation.org>
To:	Jeremy Fitzhardinge <jeremy@...p.org>
cc:	William Lee Irwin III <wli@...omorphy.com>,
	Andi Kleen <ak@...e.de>, Ingo Molnar <mingo@...e.hu>,
	Thomas Gleixner <tglx@...utronix.de>,
	Nick Piggin <nickpiggin@...oo.com.au>,
	"H. Peter Anvin" <hpa@...or.com>,
	Linux Kernel Mailing List <linux-kernel@...r.kernel.org>
Subject: Re: Why preallocate pmd in x86 32-bit PAE?



On Fri, 16 Nov 2007, Jeremy Fitzhardinge wrote:
> 
> If you happened to do a 1G munmap, it may end up freeing and 
> reallocating them, but that's going to be very rare.

I don't think we ever free the pmd's now, do we?

(Except for the *final* free, of course, when we release the whole VM).

		Linus
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