linux-kernel - Re: [PATCH 4/8] struct page: add field for vm

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Message-ID: <20180313220040.GA15791@bombadil.infradead.org>
Date:   Tue, 13 Mar 2018 15:00:40 -0700
From:   Matthew Wilcox <willy@...radead.org>
To:     Igor Stoppa <igor.stoppa@...wei.com>
Cc:     david@...morbit.com, rppt@...ux.vnet.ibm.com,
        keescook@...omium.org, mhocko@...nel.org, labbott@...hat.com,
        linux-security-module@...r.kernel.org, linux-mm@...ck.org,
        linux-kernel@...r.kernel.org, kernel-hardening@...ts.openwall.com
Subject: Re: [PATCH 4/8] struct page: add field for vm_struct

On Tue, Mar 13, 2018 at 11:45:50PM +0200, Igor Stoppa wrote:
> When a page is used for virtual memory, it is often necessary to obtain
> a handler to the corresponding vm_struct, which refers to the virtually
> continuous area generated when invoking vmalloc.
> 
> The struct page has a "mapping" field, which can be re-used, to store a
> pointer to the parent area.
> 
> This will avoid more expensive searches, later on.
> 
> Signed-off-by: Igor Stoppa <igor.stoppa@...wei.com>

Reviewed-by: Matthew Wilcox <mawilcox@...rosoft.com>

Regardless of the fate of the rest of this patchset, this makes sense
and we should have this.