linux-kernel - Re: [PATCH 0/7] Record the mm_struct in the page table pages

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Message-ID: <20200429002624.qkhb362moj6v3vtw@box>
Date:   Wed, 29 Apr 2020 03:26:24 +0300
From:   "Kirill A. Shutemov" <kirill@...temov.name>
To:     Matthew Wilcox <willy@...radead.org>
Cc:     linux-mm@...ck.org, linux-kernel@...r.kernel.org,
        linux-arm-kernel@...ts.infradead.org,
        Will Deacon <will@...nel.org>,
        Catalin Marinas <catalin.marinas@....com>,
        Russell King <linux@...linux.org.uk>,
        Geert Uytterhoeven <geert@...ux-m68k.org>,
        linux-m68k@...ts.linux-m68k.org
Subject: Re: [PATCH 0/7] Record the mm_struct in the page table pages

On Tue, Apr 28, 2020 at 12:44:42PM -0700, Matthew Wilcox wrote:
> From: "Matthew Wilcox (Oracle)" <willy@...radead.org>
> 
> Pages which are in use as page tables have some space unused in struct
> page.  It would be handy to have a pointer to the struct mm_struct that
> they belong to so that we can handle uncorrectable errors in page tables
> more gracefully.  There are a few other things we could use it for too,
> such as checking that the page table entry actually belongs to the task
> we think it ought to.  This patch series does none of that, but does
> lay the groundwork for it.
> 
> Matthew Wilcox (Oracle) (7):

How does it work for kernel side of virtual address space?

And your employer may be interested in semantics around
CONFIG_ARCH_WANT_HUGE_PMD_SHARE :P

-- 
 Kirill A. Shutemov