From: Andrew Morton <akpm@linux-foundation.org>
To: Wei Wang <wei.w.wang@intel.com>
Cc: virtio-dev@lists.oasis-open.org, linux-kernel@vger.kernel.org,
virtualization@lists.linux-foundation.org, kvm@vger.kernel.org,
linux-mm@kvack.org, mst@redhat.com, mhocko@kernel.org,
pbonzini@redhat.com, liliang.opensource@gmail.com,
yang.zhang.wz@gmail.com, quan.xu0@gmail.com, nilal@redhat.com,
riel@redhat.com
Subject: Re: [PATCH v25 1/2 RESEND] mm: support reporting free page blocks
Date: Thu, 25 Jan 2018 14:41:24 -0800 [thread overview]
Message-ID: <20180125144124.7e9f6e2156b1b940b07aecfc@linux-foundation.org> (raw)
In-Reply-To: <1516873107-34950-1-git-send-email-wei.w.wang@intel.com>
On Thu, 25 Jan 2018 17:38:27 +0800 Wei Wang <wei.w.wang@intel.com> wrote:
> This patch adds support to walk through the free page blocks in the
> system and report them via a callback function. Some page blocks may
> leave the free list after zone->lock is released, so it is the caller's
> responsibility to either detect or prevent the use of such pages.
>
> One use example of this patch is to accelerate live migration by skipping
> the transfer of free pages reported from the guest. A popular method used
> by the hypervisor to track which part of memory is written during live
> migration is to write-protect all the guest memory. So, those pages that
> are reported as free pages but are written after the report function
> returns will be captured by the hypervisor, and they will be added to the
> next round of memory transfer.
It would be useful if we had some quantitative testing results, so we
can see the real-world benefits from this change?
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next prev parent reply other threads:[~2018-01-25 22:41 UTC|newest]
Thread overview: 4+ messages / expand[flat|nested] mbox.gz Atom feed top
2018-01-25 9:38 Wei Wang
2018-01-25 10:02 ` [virtio-dev] " Wei Wang
2018-01-25 22:41 ` Andrew Morton [this message]
2018-01-26 2:11 ` Wei Wang
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