linux-kernel - Re: [HMM 11/16] mm/hmm/mirror: helper to snapshot CPU page table v2

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Message-ID: <20170319200942.GI2774@techsingularity.net>
Date:   Sun, 19 Mar 2017 20:09:42 +0000
From:   Mel Gorman <mgorman@...hsingularity.net>
To:     J?r?me Glisse <jglisse@...hat.com>
Cc:     akpm@...ux-foundation.org, linux-kernel@...r.kernel.org,
        linux-mm@...ck.org, John Hubbard <jhubbard@...dia.com>,
        Naoya Horiguchi <n-horiguchi@...jp.nec.com>,
        David Nellans <dnellans@...dia.com>,
        Evgeny Baskakov <ebaskakov@...dia.com>,
        Mark Hairgrove <mhairgrove@...dia.com>,
        Sherry Cheung <SCheung@...dia.com>,
        Subhash Gutti <sgutti@...dia.com>
Subject: Re: [HMM 11/16] mm/hmm/mirror: helper to snapshot CPU page table v2

On Thu, Mar 16, 2017 at 12:05:30PM -0400, J?r?me Glisse wrote:
> This does not use existing page table walker because we want to share
> same code for our page fault handler.
> 
> Changes since v1:
>   - Use spinlock instead of rcu synchronized list traversal
> 

Didn't look too closely here because pagetable walking code tends to have
few surprises but presumably there will be some 5-level page table
updates.