linux-kernel - Re: [PATCH, RFC 0/2] Share PMDs for FS/DAX on x86

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Message-ID: <20190514122820.26zddpb27uxgrwzp@box>
Date:   Tue, 14 May 2019 15:28:20 +0300
From:   "Kirill A. Shutemov" <kirill@...temov.name>
To:     Larry Bassel <larry.bassel@...cle.com>
Cc:     mike.kravetz@...cle.com, willy@...radead.org,
        dan.j.williams@...el.com, linux-mm@...ck.org,
        linux-kernel@...r.kernel.org, linux-nvdimm@...ts.01.org
Subject: Re: [PATCH, RFC 0/2] Share PMDs for FS/DAX on x86

On Thu, May 09, 2019 at 09:05:31AM -0700, Larry Bassel wrote:
> This patchset implements sharing of page table entries pointing
> to 2MiB pages (PMDs) for FS/DAX on x86.

-EPARSE.

How do you share entries? Entries do not take any space, page tables that
cointain these entries do.

Have you checked if the patch makes memory consumption any better. I have
doubts in it.