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From: Alexander Duyck <alexander.duyck@gmail.com>
To: Dave Hansen <dave.hansen@intel.com>
Cc: David Hildenbrand <david@redhat.com>,
	Nitesh Narayan Lal <nitesh@redhat.com>,
	kvm list <kvm@vger.kernel.org>,
	"Michael S. Tsirkin" <mst@redhat.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 0/6] mm / virtio: Provide support for paravirtual waste page treatment
Date: Tue, 25 Jun 2019 10:00:51 -0700
Message-ID: <CAKgT0UdAj4Kq8qHKkaiB3z08gCQh-jovNpos45VcGHa_v5aFGg@mail.gmail.com> (raw)
In-Reply-To: <8fea71ba-2464-ead8-3802-2241805283cc@intel.com>

On Tue, Jun 25, 2019 at 7:10 AM Dave Hansen <dave.hansen@intel.com> wrote:
>
> On 6/25/19 12:42 AM, David Hildenbrand wrote:
> > On 20.06.19 00:32, Alexander Duyck wrote:
> > I still *detest* the terminology, sorry. Can't you come up with a
> > simpler terminology that makes more sense in the context of operating
> > systems and pages we want to hint to the hypervisor? (that is the only
> > use case you are using it for so far)
>
> It's a wee bit too cute for my taste as well.  I could probably live
> with it in the data structures, but having it show up out in places like
> Kconfig and filenames goes too far.
>
> For instance, someone seeing memory_aeration.c will have no concept
> what's in the file.  Could we call it something like memory_paravirt.c?
>  Or even mm/paravirt.c.

Well I couldn't come up with a better explanation of what this was
doing, also I wanted to avoid mentioning hinting specifically because
there have already been a few series that have been committed upstream
that reference this for slightly different purposes such as the one by
Wei Wang that was doing free memory tracking for migration purposes,
https://lkml.org/lkml/2018/7/10/211.

Basically what we are doing is inflating the memory size we can report
by inserting voids into the free memory areas. In my mind that matches
up very well with what "aeration" is. It is similar to balloon in
functionality, however instead of inflating the balloon we are
inflating the free_list for higher order free areas by creating voids
where the madvised pages were.

> Could you talk for a minute about why the straightforward naming like
> "hinted/unhinted" wasn't used?  Is there something else we could ever
> use this infrastructure for that is not related to paravirtualized free
> page hinting?

I was hoping there might be something in the future that could use the
infrastructure if it needed to go through and sort out used versus
unused memory. The way things are designed right now for instance
there is only really a define that is limiting the lowest order pages
that are processed. So if we wanted to use this for another purpose we
could replace the AERATOR_MIN_ORDER define with something that is
specific to that use case.

  reply index

Thread overview: 59+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2019-06-19 22:32 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
2019-06-25 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
2019-06-19 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
2019-06-19 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 19:36       ` Dave Hansen
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 16:12             ` Michael S. Tsirkin
2019-07-16 15:02           ` David Hildenbrand
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 17:41           ` Michael S. Tsirkin
2019-07-16 21:06             ` Alexander Duyck
2019-07-17 10:28               ` Michael S. Tsirkin
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 16:03                       ` Nitesh Narayan Lal
2019-07-18 20:27                         ` Michael S. Tsirkin
2019-07-18 16:07                       ` Michael S. Tsirkin
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 20:24                       ` Michael S. Tsirkin
2019-07-18 20:34                         ` Alexander Duyck
2019-07-18 20:48                           ` Michael S. Tsirkin
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 [this message]
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
2019-06-25 16:09   ` Alexander Duyck
2019-06-26  9:01   ` Christophe de Dinechin
2019-06-26  9:12     ` David Hildenbrand

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