[RFC,0/3] few memory offlining enhancements

Message ID	20181120134323.13007-1-mhocko@kernel.org (mailing list archive)
Headers	show Return-Path: <owner-linux-mm@kvack.org> Received-SPF: pass (google.com: domain of mstsxfx@gmail.com designates 209.85.220.65 as permitted sender) client-ip=209.85.220.65; From: Michal Hocko <mhocko@kernel.org> To: <linux-mm@kvack.org> Cc: Andrew Morton <akpm@linux-foundation.org>, Oscar Salvador <OSalvador@suse.com>, Pavel Tatashin <pasha.tatashin@oracle.com>, David Hildenbrand <david@redhat.com>, LKML <linux-kernel@vger.kernel.org>, Jan Kara <jack@suse.cz>, "Kirill A. Shutemov" <kirill@shutemov.name>, Michal Hocko <mhocko@suse.com> Subject: [RFC PATCH 0/3] few memory offlining enhancements Date: Tue, 20 Nov 2018 14:43:20 +0100 Message-Id: <20181120134323.13007-1-mhocko@kernel.org> MIME-Version: 1.0 Content-Transfer-Encoding: 8bit Sender: owner-linux-mm@kvack.org Precedence: bulk
Series	few memory offlining enhancements \| expand [RFC,0/3] few memory offlining enhancements [RFC,1/3] mm, memory_hotplug: try to migrate full section worth of pages [RFC,2/3] mm, memory_hotplug: deobfuscate migration part of offlining [RFC,3/3] mm, fault_around: do not take a reference to a locked page

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20181120134323.13007-1-mhocko@kernel.org (mailing list archive)

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From: Michal Hocko <mhocko@kernel.org>
To: <linux-mm@kvack.org>
Cc: Andrew Morton <akpm@linux-foundation.org>,
	Oscar Salvador <OSalvador@suse.com>,
	Pavel Tatashin <pasha.tatashin@oracle.com>,
	David Hildenbrand <david@redhat.com>,
	LKML <linux-kernel@vger.kernel.org>,
	Jan Kara <jack@suse.cz>,
	"Kirill A. Shutemov" <kirill@shutemov.name>,
	Michal Hocko <mhocko@suse.com>
Subject: [RFC PATCH 0/3] few memory offlining enhancements
Date: Tue, 20 Nov 2018 14:43:20 +0100
Message-Id: <20181120134323.13007-1-mhocko@kernel.org>
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few memory offlining enhancements | expand

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Michal Hocko Nov. 20, 2018, 1:43 p.m. UTC

I have been chasing memory offlining not making progress recently. On
the way I have noticed few weird decisions in the code. The migration
itself is restricted without a reasonable justification and the retry
loop around the migration is quite messy. This is addressed by patch 1
and patch 2.

Patch 3 is targeting on the faultaround code which has been a hot
candidate for the initial issue reported upstream [1] and that I am
debugging internally. It turned out to be not the main contributor
in the end but I believe we should address it regardless. See the patch
description for more details.

[1] http://lkml.kernel.org/r/20181114070909.GB2653@MiWiFi-R3L-srv