From: Mel Gorman <mgorman@techsingularity.net>
To: Alexander Duyck <alexander.h.duyck@linux.intel.com>
Cc: Andrew Morton <akpm@linux-foundation.org>,
Alexander Duyck <alexander.duyck@gmail.com>,
kvm@vger.kernel.org, david@redhat.com, mst@redhat.com,
linux-kernel@vger.kernel.org, linux-mm@kvack.org,
yang.zhang.wz@gmail.com, pagupta@redhat.com,
konrad.wilk@oracle.com, nitesh@redhat.com, riel@surriel.com,
willy@infradead.org, lcapitulino@redhat.com,
dave.hansen@intel.com, wei.w.wang@intel.com, aarcange@redhat.com,
pbonzini@redhat.com, dan.j.williams@intel.com, mhocko@kernel.org,
vbabka@suse.cz, osalvador@suse.de
Subject: Re: [PATCH v17 0/9] mm / virtio: Provide support for free page reporting
Date: Wed, 19 Feb 2020 08:49:12 +0000 [thread overview]
Message-ID: <20200219084912.GO3466@techsingularity.net> (raw)
In-Reply-To: <31383bb111737c9f8ffbb1e6e4446cb4fd620a53.camel@linux.intel.com>
On Tue, Feb 18, 2020 at 08:37:46AM -0800, Alexander Duyck wrote:
> On Tue, 2020-02-11 at 16:19 -0800, Andrew Morton wrote:
> > On Tue, 11 Feb 2020 15:55:31 -0800 Alexander Duyck <alexander.h.duyck@linux.intel.com> wrote:
> >
> > > On the host I just have to monitor /proc/meminfo and I can see the
> > > difference. I get the following results on the host, in the enabled case
> > > it takes about 30 seconds for it to settle into the final state since I
> > > only report page a bit at a time:
> > > Baseline/Applied
> > > MemTotal: 131963012 kB
> > > MemFree: 95189740 kB
> > >
> > > Enabled:
> > > MemTotal: 131963012 kB
> > > MemFree: 126459472 kB
> > >
> > > This is what I was referring to with the comment above. I had a test I was
> > > running back around the first RFC that consisted of bringing up enough VMs
> > > so that there was a bit of memory overcommit and then having the VMs in
> > > turn run memhog. As I recall the difference between the two was something
> > > like a couple minutes to run through all the VMs as the memhog would take
> > > up to 40+ seconds for one that was having to pull from swap while it took
> > > only 5 to 7 seconds for the VMs that were all running the page hinting.
> > >
> > > I had referenced it here in the RFC:
> > > https://lore.kernel.org/lkml/20190204181118.12095.38300.stgit@localhost.localdomain/
> > >
> > > I have been verifying the memory has been getting freed but didn't feel
> > > like the test added much value so I haven't added it to the cover page for
> > > a while since the time could vary widely and is dependent on things like
> > > the disk type used for the host swap since my SSD is likely faster than
> > > spinning rust, but may not be as fast as other SSDs on the market. Since
> > > the disk speed can play such a huge role I wasn't comfortable posting
> > > numbers since the benefits could vary so widely.
> >
> > OK, thanks. I'll add the patches to the mm pile. The new
> > mm/page_reporting.c is unreviewed afaict, so I guess you own that for
> > now ;)
> >
> > It would be very nice to get some feedback from testers asserting "yes,
> > this really helped my workload" but I understand this sort of testing
> > is hard to obtain at this stage.
> >
>
> Mel,
>
> Any ETA on when you would be available to review these patches? They are
> now in Andrew's tree and in linux-next. I am hoping to get any remaining
> review from the community sorted out in the next few weeks so I can move
> onto focusing on how best to exert pressure on the page cache so that we
> can keep the guest memory footprint small.
>
I hope to get to it soon. I'm trying to finalise a scheduler-related
series that reconciles NUMA and CPU balancing and it's occupying much of
my attention available for mainline development :(
--
Mel Gorman
SUSE Labs
next prev parent reply other threads:[~2020-02-19 8:54 UTC|newest]
Thread overview: 29+ messages / expand[flat|nested] mbox.gz Atom feed top
2020-02-11 22:45 [PATCH v17 0/9] mm / virtio: Provide support for free page reporting Alexander Duyck
2020-02-11 22:46 ` [PATCH v17 1/9] mm: Adjust shuffle code to allow for future coalescing Alexander Duyck
2020-02-11 22:46 ` [PATCH v17 2/9] mm: Use zone and order instead of free area in free_list manipulators Alexander Duyck
2020-02-11 22:46 ` [PATCH v17 3/9] mm: Add function __putback_isolated_page Alexander Duyck
2020-02-19 14:33 ` Mel Gorman
2020-02-11 22:46 ` [PATCH v17 4/9] mm: Introduce Reported pages Alexander Duyck
2020-02-19 14:55 ` Mel Gorman
2020-02-20 18:44 ` Alexander Duyck
2020-02-20 22:35 ` Mel Gorman
2020-02-21 19:25 ` Alexander Duyck
2020-02-21 20:19 ` Mel Gorman
2020-02-11 22:46 ` [PATCH v17 5/9] virtio-balloon: Pull page poisoning config out of free page hinting Alexander Duyck
2020-02-11 22:46 ` [PATCH v17 6/9] virtio-balloon: Add support for providing free page reports to host Alexander Duyck
2020-02-11 22:47 ` [PATCH v17 7/9] mm/page_reporting: Rotate reported pages to the tail of the list Alexander Duyck
2020-02-19 14:59 ` Mel Gorman
2020-02-11 22:47 ` [PATCH v17 8/9] mm/page_reporting: Add budget limit on how many pages can be reported per pass Alexander Duyck
2020-02-19 15:02 ` Mel Gorman
2020-02-11 22:47 ` [PATCH v17 9/9] mm/page_reporting: Add free page reporting documentation Alexander Duyck
2020-02-11 22:51 ` [PATCH v17 QEMU 1/3] virtio-ballon: Implement support for page poison tracking feature Alexander Duyck
2020-02-11 22:51 ` [PATCH v17 QEMU 2/3] virtio-balloon: Add support for providing free page reports to host Alexander Duyck
2020-02-11 22:51 ` [PATCH v17 QEMU 3/3] virtio-balloon: Provide a interface for free page reporting Alexander Duyck
2020-02-11 22:53 ` [PATCH v17 QEMU 4/3 RFC] memory: Add support for MADV_FREE as mechanism to lazy discard pages Alexander Duyck
2020-02-11 23:05 ` [PATCH v17 0/9] mm / virtio: Provide support for free page reporting Andrew Morton
2020-02-11 23:55 ` Alexander Duyck
2020-02-12 0:19 ` Andrew Morton
2020-02-12 1:19 ` Alexander Duyck
2020-02-18 16:37 ` Alexander Duyck
2020-02-19 8:49 ` Mel Gorman [this message]
2020-02-19 15:06 ` Mel Gorman
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