This patch introduces the core infrastructure for free page reporting in
virtual environments. It enables the kernel to track the free pages which
can be reported to its hypervisor so that the hypervisor could
free and reuse that memory as per its requirement.
While the pages are getting processed
This patch series proposes an efficient mechanism for reporting free memory
from a guest to its hypervisor. It especially enables guests with no page cache
(e.g., nvdimm, virtio-pmem) or with small page caches (e.g., ram > disk) to
rapidly hand back free memory to the hypervisor.
This approach has
Enables the kernel to negotiate VIRTIO_BALLOON_F_REPORTING feature with
the host. If it is available and page_reporting_flag is set to true,
page_reporting is enabled and its callback is configured along with
the max_pages count which indicates the maximum number of pages that
can be isolated and r
This patch will be replaced once the feature is merged into the
Linux kernel.
Signed-off-by: Nitesh Narayan Lal
---
include/standard-headers/linux/virtio_balloon.h | 1 +
1 file changed, 1 insertion(+)
diff --git a/include/standard-headers/linux/virtio_balloon.h
b/include/standard-headers/linu
Page reporting is a feature which enables the virtual machine to report
chunk of free pages to the hypervisor.
This patch enables QEMU to process these reports from the VM and discard the
unused memory range.
Signed-off-by: Nitesh Narayan Lal
---
hw/virtio/virtio-balloon.c | 41 +
On Fri, Jul 26, 2019 at 07:41:57AM -0400, Michael S. Tsirkin wrote:
> On Fri, Jul 26, 2019 at 10:53:38AM +0100, Stefan Hajnoczi wrote:
> > Describe how shared memory region ID 0 is the DAX window and how
> > FUSE_SETUPMAPPING maps file ranges into the window.
> >
> > Signed-off-by: Stefan Hajnoczi
On Fri, Jul 26, 2019 at 01:34:16PM +0100, Dr. David Alan Gilbert wrote:
> * Michael S. Tsirkin (m...@redhat.com) wrote:
> > Didn't look at the spec yet, but I have a question:
> >
> > On Fri, Jul 26, 2019 at 10:53:36AM +0100, Stefan Hajnoczi wrote:
> > > v5:
> > > * Explain multiqueue semantics:
On Mon, Aug 12, 2019 at 6:14 AM Nitesh Narayan Lal wrote:
>
> Page reporting is a feature which enables the virtual machine to report
> chunk of free pages to the hypervisor.
> This patch enables QEMU to process these reports from the VM and discard the
> unused memory range.
>
> Signed-off-by: Ni
On 8/12/19 11:18 AM, Alexander Duyck wrote:
> On Mon, Aug 12, 2019 at 6:14 AM Nitesh Narayan Lal wrote:
>> Page reporting is a feature which enables the virtual machine to report
>> chunk of free pages to the hypervisor.
>> This patch enables QEMU to process these reports from the VM and discard
On Mon, Aug 12, 2019 at 6:13 AM Nitesh Narayan Lal wrote:
>
> This patch introduces the core infrastructure for free page reporting in
> virtual environments. It enables the kernel to track the free pages which
> can be reported to its hypervisor so that the hypervisor could
> free and reuse that
>> ---
>> include/linux/mmzone.h | 11 ++
>> include/linux/page_reporting.h | 63 +++
>> mm/Kconfig | 6 +
>> mm/Makefile| 1 +
>> mm/page_alloc.c| 42 -
>> mm/page_reporting.c| 332 +
On 8/12/19 2:47 PM, Alexander Duyck wrote:
> On Mon, Aug 12, 2019 at 6:13 AM Nitesh Narayan Lal wrote:
>> This patch introduces the core infrastructure for free page reporting in
>> virtual environments. It enables the kernel to track the free pages which
>> can be reported to its hypervisor so
From: Alexander Duyck
In order to support page reporting it will be necessary to store and
retrieve the migratetype of a page. To enable that I am moving the set and
get operations for pcppage_migratetype into the mm/internal.h header so
that they can be used outside of the page_alloc.c file.
Si
From: Alexander Duyck
This patch is meant to move the head/tail adding logic out of the shuffle
code and into the __free_one_page function since ultimately that is where
it is really needed anyway. By doing this we should be able to reduce the
overhead and can consolidate all of the list addition
This series provides an asynchronous means of reporting to a hypervisor
that a guest page is no longer in use and can have the data associated
with it dropped. To do this I have implemented functionality that allows
for what I am referring to as unused page reporting
The functionality for this is
From: Alexander Duyck
Add support for the page reporting feature provided by virtio-balloon.
Reporting differs from the regular balloon functionality in that is is
much less durable than a standard memory balloon. Instead of creating a
list of pages that cannot be accessed the pages are only inac
From: Alexander Duyck
We need to make certain to advertise support for page poison tracking if
we want to actually get data on if the guest will be poisoning pages. So
if free page hinting is active we should add page poisoning support and
let the guest disable it if it isn't using it.
Page pois
From: Alexander Duyck
Currently the page poisoning setting wasn't being enabled unless free page
hinting was enabled. However we will need the page poisoning tracking logic
as well for unused page reporting. As such pull it out and make it a
separate bit of config in the probe function.
In addit
From: Alexander Duyck
Add a bit for the page reporting feature provided by virtio-balloon.
This patch should be replaced once the feature is added to the Linux kernel
and the bit is backported into this exported kernel header.
Signed-off-by: Alexander Duyck
---
include/standard-headers/linux/
From: Alexander Duyck
In order to enable the use of the zone from the list manipulator functions
I will need access to the zone pointer. As it turns out most of the
accessors were always just being directly passed &zone->free_area[order]
anyway so it would make sense to just fold that into the fu
From: Alexander Duyck
Add support for what I am referring to as "unused page reporting".
Basically the idea is to function very similar to how the balloon works
in that we basically end up madvising the page as not being used. However
we don't really need to bother with any deflate type logic sin
From: Alexander Duyck
In order to pave the way for free page reporting in virtualized
environments we will need a way to get pages out of the free lists and
identify those pages after they have been returned. To accomplish this,
this patch adds the concept of a Reported Buddy, which is essentiall
On Mon, Aug 12, 2019 at 3:24 PM Dan Williams wrote:
>
> On Mon, Aug 12, 2019 at 2:33 PM Alexander Duyck
> wrote:
> >
> > From: Alexander Duyck
> >
> > This patch is meant to move the head/tail adding logic out of the shuffle
>
> s/This patch is meant to move/Move/
I'll update that on next submi
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