linux-kernel - [PATCHv3 00/10] mm, xen/balloon: memory hotplug improvements

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Message-ID: <1438275792-5726-1-git-send-email-david.vrabel@citrix.com>
Date:	Thu, 30 Jul 2015 18:03:02 +0100
From:	David Vrabel <david.vrabel@...rix.com>
To:	<linux-kernel@...r.kernel.org>, <xen-devel@...ts.xenproject.org>
CC:	David Vrabel <david.vrabel@...rix.com>, <linux-mm@...ck.org>,
	"Konrad Rzeszutek Wilk" <konrad.wilk@...cle.com>,
	Boris Ostrovsky <boris.ostrovsky@...cle.com>,
	Daniel Kiper <daniel.kiper@...cle.com>
Subject: [PATCHv3 00/10] mm, xen/balloon: memory hotplug improvements

The series improves the use of hotplug memory in the Xen balloon
driver.

- Reliably find a non-conflicting location for the hotplugged memory
  (this fixes memory hotplug in a number of cases, particularly in
  dom0).

- Use hotplugged memory for alloc_xenballooned_pages() (keeping more
  memory available for the domain and reducing fragmentation of the
  p2m).

Changes in v3:
- xen.balloon.hotplug_unpopulated sysctl to enable using hotplug to
  provide unpopulated (ballooned) pages.
- Fix xen_alloc_p2m_entry() for auto-translated guests.

Changes in v2:
- New BP_WAIT state to signal the balloon process to wait for
  userspace to online the new memory.
- Preallocate P2M entries in alloc_xenballooned_pages() so they do not
  need allocated later (in a context where GFP_KERNEL allocations are
  not possible).

David

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