From: Alexander Duyck <alexander.duyck@gmail.com>
To: "Michael S. Tsirkin" <mst@redhat.com>
Cc: Nitesh Narayan Lal <nitesh@redhat.com>,
kvm list <kvm@vger.kernel.org>,
David Hildenbrand <david@redhat.com>,
Dave Hansen <dave.hansen@intel.com>,
LKML <linux-kernel@vger.kernel.org>,
Matthew Wilcox <willy@infradead.org>,
Michal Hocko <mhocko@kernel.org>, linux-mm <linux-mm@kvack.org>,
Andrew Morton <akpm@linux-foundation.org>,
virtio-dev@lists.oasis-open.org,
Oscar Salvador <osalvador@suse.de>,
Yang Zhang <yang.zhang.wz@gmail.com>,
Pankaj Gupta <pagupta@redhat.com>,
Rik van Riel <riel@surriel.com>,
Konrad Rzeszutek Wilk <konrad.wilk@oracle.com>,
lcapitulino@redhat.com, "Wang, Wei W" <wei.w.wang@intel.com>,
Andrea Arcangeli <aarcange@redhat.com>,
Paolo Bonzini <pbonzini@redhat.com>,
Dan Williams <dan.j.williams@intel.com>,
Alexander Duyck <alexander.h.duyck@linux.intel.com>
Subject: Re: [PATCH v8 0/7] mm / virtio: Provide support for unused page reporting
Date: Fri, 6 Sep 2019 20:15:20 -0700 [thread overview]
Message-ID: <CAKgT0UcuZQPzcQ6cA5tKPG3+4yQP2jk+AHYcjoyrMXq0pBAiBw@mail.gmail.com> (raw)
In-Reply-To: <20190906112155-mutt-send-email-mst@kernel.org>
On Fri, Sep 6, 2019 at 8:23 AM Michael S. Tsirkin <mst@redhat.com> wrote:
>
> On Fri, Sep 06, 2019 at 07:53:21AM -0700, Alexander Duyck wrote:
> > 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 fairly simple. When enabled it will allocate
> > statistics to track the number of reported pages in a given free area.
> > When the number of free pages exceeds this value plus a high water value,
> > currently 32, it will begin performing page reporting which consists of
> > pulling pages off of free list and placing them into a scatter list. The
> > scatterlist is then given to the page reporting device and it will perform
> > the required action to make the pages "reported", in the case of
> > virtio-balloon this results in the pages being madvised as MADV_DONTNEED
> > and as such they are forced out of the guest. After this they are placed
> > back on the free list, and an additional bit is added if they are not
> > merged indicating that they are a reported buddy page instead of a
> > standard buddy page. The cycle then repeats with additional non-reported
> > pages being pulled until the free areas all consist of reported pages.
> >
> > I am leaving a number of things hard-coded such as limiting the lowest
> > order processed to PAGEBLOCK_ORDER, and have left it up to the guest to
> > determine what the limit is on how many pages it wants to allocate to
> > process the hints. The upper limit for this is based on the size of the
> > queue used to store the scattergather list.
>
> I queued this so this gets tested on linux-next but the mm core changes
> need acks from appropriate people.
Looks like there was a couple issues on arm64 and ia64 architectures.
I believe I have those fixed up and will submit a v9 in the morning
after my test runs have completed.
Thanks.
- Alex
prev parent reply other threads:[~2019-09-07 3:15 UTC|newest]
Thread overview: 16+ messages / expand[flat|nested] mbox.gz Atom feed top
2019-09-06 14:53 [PATCH v8 0/7] mm / virtio: Provide support for unused page reporting Alexander Duyck
2019-09-06 14:53 ` [PATCH v8 1/7] mm: Add per-cpu logic to page shuffling Alexander Duyck
2019-09-06 17:33 ` Dan Williams
2019-09-06 14:53 ` [PATCH v8 2/7] mm: Adjust shuffle code to allow for future coalescing Alexander Duyck
2019-09-06 17:36 ` Dan Williams
2019-09-06 14:53 ` [PATCH v8 3/7] mm: Move set/get_pcppage_migratetype to mmzone.h Alexander Duyck
2019-09-06 14:53 ` [PATCH v8 4/7] mm: Use zone and order instead of free area in free_list manipulators Alexander Duyck
2019-09-06 14:53 ` [PATCH v8 5/7] mm: Introduce Reported pages Alexander Duyck
2019-09-06 14:53 ` [PATCH v8 6/7] virtio-balloon: Pull page poisoning config out of free page hinting Alexander Duyck
2019-09-06 14:54 ` [PATCH v8 7/7] virtio-balloon: Add support for providing unused page reports to host Alexander Duyck
2019-09-06 14:54 ` [PATCH v8 QEMU 1/3] virtio-ballon: Implement support for page poison tracking feature Alexander Duyck
2019-09-06 14:54 ` [PATCH v8 QEMU 2/3] virtio-balloon: Add bit to notify guest of unused page reporting Alexander Duyck
2019-09-06 14:54 ` [PATCH v8 QEMU 3/3] virtio-balloon: Provide a interface for " Alexander Duyck
2019-09-06 15:23 ` [PATCH v8 0/7] mm / virtio: Provide support " Michael S. Tsirkin
2019-09-06 15:25 ` Alexander Duyck
2019-09-07 3:15 ` Alexander Duyck [this message]
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