linux-kernel - Re: [PATCH V2 0/6] VA to numa node information

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Message-ID: <9315ac49-e797-567b-3bb1-36831a524eb6@intel.com>
Date:   Fri, 14 Sep 2018 12:01:10 -0700
From:   Dave Hansen <dave.hansen@...el.com>
To:     Prakash Sangappa <prakash.sangappa@...cle.com>,
        Steven Sistare <steven.sistare@...cle.com>,
        Michal Hocko <mhocko@...nel.org>
Cc:     linux-kernel@...r.kernel.org, linux-mm@...ck.org,
        nao.horiguchi@...il.com, akpm@...ux-foundation.org,
        kirill.shutemov@...ux.intel.com, khandual@...ux.vnet.ibm.com
Subject: Re: [PATCH V2 0/6] VA to numa node information

On 09/14/2018 11:04 AM, Prakash Sangappa wrote:
> Also, for valid VMAs in  'maps' file, if the VMA is sparsely
> populated with  physical pages, the page walk can skip over non
> existing page table entires (PMDs) and so can be faster.
Note that this only works for things that were _never_ populated.  They
might be sparse after once being populated and then being reclaimed or
discarded.  Those will still have all the page tables allocated.