linux-kernel - RE: [PATCH, RFC 1/2] Add config option to enable FS/DAX PMD sharing

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Message-ID: <AT5PR8401MB116928031D52A318F04A2819AB0C0@AT5PR8401MB1169.NAMPRD84.PROD.OUTLOOK.COM>
Date:   Fri, 10 May 2019 16:32:26 +0000
From:   "Elliott, Robert (Servers)" <elliott@....com>
To:     Larry Bassel <larry.bassel@...cle.com>,
        "mike.kravetz@...cle.com" <mike.kravetz@...cle.com>,
        "willy@...radead.org" <willy@...radead.org>,
        "dan.j.williams@...el.com" <dan.j.williams@...el.com>,
        "linux-mm@...ck.org" <linux-mm@...ck.org>,
        "linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
        "linux-nvdimm@...ts.01.org" <linux-nvdimm@...ts.01.org>
Subject: RE: [PATCH, RFC 1/2] Add config option to enable FS/DAX PMD sharing



> -----Original Message-----
> From: Linux-nvdimm <linux-nvdimm-bounces@...ts.01.org> On Behalf Of
> Larry Bassel
> Sent: Thursday, May 09, 2019 11:06 AM
> Subject: [PATCH, RFC 1/2] Add config option to enable FS/DAX PMD
> sharing
> 
> If enabled, sharing of FS/DAX PMDs will be attempted.
> 
...
> diff --git a/arch/x86/Kconfig b/arch/x86/Kconfig
...
> 
> +config MAY_SHARE_FSDAX_PMD
> +	def_bool y
> +

Is a config option really necessary - is there any reason to
not choose to do this?