linux-kernel - Re: [PATCH 3/6] struct page: add field for vm

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Message-ID: <alpine.DEB.2.20.1802050931190.10647@nuc-kabylake>
Date:   Mon, 5 Feb 2018 09:33:15 -0600 (CST)
From:   Christopher Lameter <cl@...ux.com>
To:     Igor Stoppa <igor.stoppa@...wei.com>
cc:     jglisse@...hat.com, keescook@...omium.org, mhocko@...nel.org,
        labbott@...hat.com, hch@...radead.org, willy@...radead.org,
        linux-security-module@...r.kernel.org, linux-mm@...ck.org,
        linux-kernel@...r.kernel.org, kernel-hardening@...ts.openwall.com
Subject: Re: [PATCH 3/6] struct page: add field for vm_struct

On Sat, 3 Feb 2018, Igor Stoppa wrote:

> - the property of the compound page will affect the property of all the
> pages in the compound, so when one is write protected, it can generate a
> lot of wasted memory, if there is too much slack (because of the order)
> With vmalloc, I can allocate any number of pages, minimizing the waste.

I thought the intend here is to create a pool where the whole pool becomes
RO?