All of lore.kernel.org
 help / color / mirror / Atom feed
From: "Michael S. Tsirkin" <mst@redhat.com>
To: Nitesh Narayan Lal <nitesh@redhat.com>
Cc: Alexander Duyck <alexander.duyck@gmail.com>,
	kvm list <kvm@vger.kernel.org>,
	David Hildenbrand <david@redhat.com>,
	Dave Hansen <dave.hansen@intel.com>,
	LKML <linux-kernel@vger.kernel.org>,
	linux-mm <linux-mm@kvack.org>,
	Andrew Morton <akpm@linux-foundation.org>,
	Yang Zhang <yang.zhang.wz@gmail.com>,
	pagupta@redhat.com, Rik van Riel <riel@surriel.com>,
	Konrad Rzeszutek Wilk <konrad.wilk@oracle.com>,
	lcapitulino@redhat.com, wei.w.wang@intel.com,
	Andrea Arcangeli <aarcange@redhat.com>,
	Paolo Bonzini <pbonzini@redhat.com>,
	dan.j.williams@intel.com,
	Alexander Duyck <alexander.h.duyck@linux.intel.com>
Subject: Re: [PATCH v1 6/6] virtio-balloon: Add support for aerating memory via hinting
Date: Thu, 18 Jul 2019 16:27:55 -0400	[thread overview]
Message-ID: <20190718162502-mutt-send-email-mst@kernel.org> (raw)
In-Reply-To: <ef01c4af-b132-4bed-b1df-0338512caacd@redhat.com>

On Thu, Jul 18, 2019 at 12:03:23PM -0400, Nitesh Narayan Lal wrote:
> >>>> For example we allocate pages until shrinker kicks in.
> >>>> Fair enough but in fact many it would be better to
> >>>> do the reverse: trigger shrinker and then send as many
> >>>> free pages as we can to host.
> >>> I'm not sure I understand this last part.
> >> Oh basically what I am saying is this: one of the reasons to use page
> >> hinting is when host is short on memory.  In that case, why don't we use
> >> shrinker to ask kernel drivers to free up memory? Any memory freed could
> >> then be reported to host.
> > Didn't the balloon driver already have a feature like that where it
> > could start shrinking memory if the host was under memory pressure?
> If you are referring to auto-ballooning (I don't think it is merged). It
> has its own set of disadvantages such as it could easily lead to OOM,
> memory corruption and so on.

Right. So what I am saying is: we could have a flag that triggers a
shrinker once before sending memory hints.
Worth considering.

-- 
MST

  reply	other threads:[~2019-07-18 20:28 UTC|newest]

Thread overview: 78+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2019-06-19 22:32 [PATCH v1 0/6] mm / virtio: Provide support for paravirtual waste page treatment Alexander Duyck
2019-06-19 22:33 ` [PATCH v1 1/6] mm: Adjust shuffle code to allow for future coalescing Alexander Duyck
2019-06-25  7:55   ` David Hildenbrand
2019-06-28 19:49     ` Alexander Duyck
2019-06-28 19:49       ` Alexander Duyck
2019-06-25 18:25   ` Dave Hansen
2019-06-25 18:26   ` Dave Hansen
2019-06-19 22:33 ` [PATCH v1 2/6] mm: Move set/get_pcppage_migratetype to mmzone.h Alexander Duyck
2019-06-25 18:28   ` Dave Hansen
2019-06-28 19:55     ` Alexander Duyck
2019-06-28 19:55       ` Alexander Duyck
2019-06-19 22:33 ` [PATCH v1 3/6] mm: Use zone and order instead of free area in free_list manipulators Alexander Duyck
2019-06-25 18:36   ` Dave Hansen
2019-06-19 22:33 ` [PATCH v1 4/6] mm: Introduce "aerated" pages Alexander Duyck
2019-06-25 19:45   ` Dave Hansen
2019-07-08 17:32     ` Alexander Duyck
2019-07-08 17:32       ` Alexander Duyck
2019-06-19 22:33 ` [PATCH v1 5/6] mm: Add logic for separating "aerated" pages from "raw" pages Alexander Duyck
2019-06-25 20:24   ` Dave Hansen
2019-07-08 19:02     ` Alexander Duyck
2019-07-08 19:02       ` Alexander Duyck
2019-07-08 19:36       ` Dave Hansen
2019-07-08 22:02         ` Alexander Duyck
2019-07-08 22:02           ` Alexander Duyck
2019-06-19 22:33 ` [PATCH v1 6/6] virtio-balloon: Add support for aerating memory via hinting Alexander Duyck
2019-07-16  9:55   ` Michael S. Tsirkin
2019-07-16 14:00     ` Dave Hansen
2019-07-16 14:12       ` David Hildenbrand
2019-07-16 14:17         ` David Hildenbrand
2019-07-16 15:04           ` Michael S. Tsirkin
2019-07-16 14:41         ` Dave Hansen
2019-07-16 15:01           ` Wang, Wei W
2019-07-16 15:01             ` Wang, Wei W
2019-07-16 16:12             ` Michael S. Tsirkin
2019-07-16 16:12               ` Michael S. Tsirkin
2019-07-16 15:02           ` David Hildenbrand
2019-07-16 15:37     ` Alexander Duyck
2019-07-16 15:37       ` Alexander Duyck
2019-07-16 16:07       ` Michael S. Tsirkin
2019-07-16 16:54         ` Alexander Duyck
2019-07-16 16:54           ` Alexander Duyck
2019-07-16 17:41           ` Michael S. Tsirkin
2019-07-16 21:06             ` Alexander Duyck
2019-07-16 21:06               ` Alexander Duyck
2019-07-17 10:28               ` Michael S. Tsirkin
2019-07-17 16:43                 ` Alexander Duyck
2019-07-17 16:43                   ` Alexander Duyck
2019-07-18  5:13                   ` Michael S. Tsirkin
2019-07-18 15:34                     ` Alexander Duyck
2019-07-18 15:34                       ` Alexander Duyck
2019-07-18 16:03                       ` Nitesh Narayan Lal
2019-07-18 20:27                         ` Michael S. Tsirkin [this message]
2019-07-18 16:07                       ` Michael S. Tsirkin
2019-07-18 20:29                         ` Alexander Duyck
2019-07-18 20:29                           ` Alexander Duyck
2019-07-18 20:37                           ` Michael S. Tsirkin
2019-07-18 20:54                             ` Alexander Duyck
2019-07-18 20:54                               ` Alexander Duyck
2019-07-18 20:24                       ` Michael S. Tsirkin
2019-07-18 20:34                         ` Alexander Duyck
2019-07-18 20:34                           ` Alexander Duyck
2019-07-18 20:48                           ` Michael S. Tsirkin
2019-07-18 21:09                             ` Alexander Duyck
2019-07-18 21:09                               ` Alexander Duyck
2019-06-19 22:37 ` [PATCH v1 QEMU] QEMU: Provide a interface for hinting based off of the balloon infrastructure Alexander Duyck
2019-06-25  7:42 ` [PATCH v1 0/6] mm / virtio: Provide support for paravirtual waste page treatment David Hildenbrand
2019-06-25 14:10   ` Dave Hansen
2019-06-25 17:00     ` Alexander Duyck
2019-06-25 17:00       ` Alexander Duyck
2019-06-25 18:12       ` David Hildenbrand
2019-06-25 18:22       ` Dave Hansen
2019-07-15  9:41         ` David Hildenbrand
2019-07-15 14:57           ` Alexander Duyck
2019-07-15 14:57             ` Alexander Duyck
2019-06-25 16:09   ` Alexander Duyck
2019-06-25 16:09     ` Alexander Duyck
2019-06-26  9:01   ` Christophe de Dinechin
2019-06-26  9:12     ` David Hildenbrand

Reply instructions:

You may reply publicly to this message via plain-text email
using any one of the following methods:

* Save the following mbox file, import it into your mail client,
  and reply-to-all from there: mbox

  Avoid top-posting and favor interleaved quoting:
  https://en.wikipedia.org/wiki/Posting_style#Interleaved_style

* Reply using the --to, --cc, and --in-reply-to
  switches of git-send-email(1):

  git send-email \
    --in-reply-to=20190718162502-mutt-send-email-mst@kernel.org \
    --to=mst@redhat.com \
    --cc=aarcange@redhat.com \
    --cc=akpm@linux-foundation.org \
    --cc=alexander.duyck@gmail.com \
    --cc=alexander.h.duyck@linux.intel.com \
    --cc=dan.j.williams@intel.com \
    --cc=dave.hansen@intel.com \
    --cc=david@redhat.com \
    --cc=konrad.wilk@oracle.com \
    --cc=kvm@vger.kernel.org \
    --cc=lcapitulino@redhat.com \
    --cc=linux-kernel@vger.kernel.org \
    --cc=linux-mm@kvack.org \
    --cc=nitesh@redhat.com \
    --cc=pagupta@redhat.com \
    --cc=pbonzini@redhat.com \
    --cc=riel@surriel.com \
    --cc=wei.w.wang@intel.com \
    --cc=yang.zhang.wz@gmail.com \
    /path/to/YOUR_REPLY

  https://kernel.org/pub/software/scm/git/docs/git-send-email.html

* If your mail client supports setting the In-Reply-To header
  via mailto: links, try the mailto: link
Be sure your reply has a Subject: header at the top and a blank line before the message body. 
This is an external index of several public inboxes,
see mirroring instructions on how to clone and mirror
all data and code used by this external index.