linux-kernel - Re: [PATCH 5/5] dax: "Hotplug" persistent memory for use like normal RAM

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Message-ID: <20190128092549.GF18811@dhcp22.suse.cz>
Date:   Mon, 28 Jan 2019 10:25:49 +0100
From:   Michal Hocko <mhocko@...nel.org>
To:     Dan Williams <dan.j.williams@...el.com>
Cc:     Jane Chu <jane.chu@...cle.com>,
        "Verma, Vishal L" <vishal.l.verma@...el.com>,
        "Du, Fan" <fan.du@...el.com>,
        "linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
        "bp@...e.de" <bp@...e.de>,
        "linux-mm@...ck.org" <linux-mm@...ck.org>,
        "dave.hansen@...ux.intel.com" <dave.hansen@...ux.intel.com>,
        "tiwai@...e.de" <tiwai@...e.de>,
        "akpm@...ux-foundation.org" <akpm@...ux-foundation.org>,
        "linux-nvdimm@...ts.01.org" <linux-nvdimm@...ts.01.org>,
        "jglisse@...hat.com" <jglisse@...hat.com>,
        "zwisler@...nel.org" <zwisler@...nel.org>,
        "baiyaowei@...s.chinamobile.com" <baiyaowei@...s.chinamobile.com>,
        "thomas.lendacky@....com" <thomas.lendacky@....com>,
        "Wu, Fengguang" <fengguang.wu@...el.com>,
        "Huang, Ying" <ying.huang@...el.com>,
        "bhelgaas@...gle.com" <bhelgaas@...gle.com>
Subject: Re: [PATCH 5/5] dax: "Hotplug" persistent memory for use like normal
 RAM

On Fri 25-01-19 11:15:08, Dan Williams wrote:
[...]
> However, we should consider this along with the userspace enabling to
> control which device-dax instances are set aside for hotplug. It would
> make sense to have a "clear errors before hotplug" configuration
> option.

I am not sure I understand. Do you mean to clear HWPoison when the
memory is hotadded (add_pages) or onlined (resp. move_pfn_range_to_zone)?
-- 
Michal Hocko
SUSE Labs