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From: David Hildenbrand <david@redhat.com>
To: Liang Li <liang.z.li@intel.com>, kvm@vger.kernel.org
Cc: virtio-dev@lists.oasis-open.org, mhocko@suse.com, mst@redhat.com,
	dave.hansen@intel.com, qemu-devel@nongnu.org,
	linux-kernel@vger.kernel.org, linux-mm@kvack.org,
	kirill.shutemov@linux.intel.com, pbonzini@redhat.com,
	akpm@linux-foundation.org,
	virtualization@lists.linux-foundation.org, dgilbert@redhat.com
Subject: Re: [PATCH kernel v5 0/5] Extend virtio-balloon for fast (de)inflating & fast live migration
Date: Tue, 6 Dec 2016 09:40:47 +0100	[thread overview]
Message-ID: <f67ca79c-ad34-59dd-835f-e7bc9dcaef58@redhat.com> (raw)
In-Reply-To: <1480495397-23225-1-git-send-email-liang.z.li@intel.com>

Am 30.11.2016 um 09:43 schrieb Liang Li:
> This patch set contains two parts of changes to the virtio-balloon.
>
> One is the change for speeding up the inflating & deflating process,
> the main idea of this optimization is to use bitmap to send the page
> information to host instead of the PFNs, to reduce the overhead of
> virtio data transmission, address translation and madvise(). This can
> help to improve the performance by about 85%.

Do you have some statistics/some rough feeling how many consecutive bits 
are usually set in the bitmaps? Is it really just purely random or is 
there some granularity that is usually consecutive?

IOW in real examples, do we have really large consecutive areas or are 
all pages just completely distributed over our memory?

Thanks!

-- 

David

  parent reply	other threads:[~2016-12-06  8:40 UTC|newest]

Thread overview: 41+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2016-11-30  8:43 [PATCH kernel v5 0/5] Extend virtio-balloon for fast (de)inflating & fast live migration Liang Li
2016-11-30  8:43 ` [PATCH kernel v5 1/5] virtio-balloon: rework deflate to add page to a list Liang Li
2016-11-30  8:43 ` [PATCH kernel v5 2/5] virtio-balloon: define new feature bit and head struct Liang Li
2016-11-30  8:43 ` [PATCH kernel v5 3/5] virtio-balloon: speed up inflate/deflate process Liang Li
2016-11-30  8:43 ` [PATCH kernel v5 4/5] virtio-balloon: define flags and head for host request vq Liang Li
2016-11-30  8:43 ` [PATCH kernel v5 5/5] virtio-balloon: tell host vm's unused page info Liang Li
2016-11-30 19:15   ` Dave Hansen
2016-12-04 13:13     ` Li, Liang Z
2016-12-05 17:22       ` Dave Hansen
2016-12-06  4:47         ` Li, Liang Z
2016-12-06  8:40 ` David Hildenbrand [this message]
2016-12-07 13:35   ` [PATCH kernel v5 0/5] Extend virtio-balloon for fast (de)inflating & fast live migration Li, Liang Z
2016-12-07 15:34     ` Dave Hansen
2016-12-09  3:09       ` Li, Liang Z
2016-12-07 15:42     ` David Hildenbrand
2016-12-07 15:45       ` Dave Hansen
2016-12-07 16:21         ` David Hildenbrand
2016-12-07 16:57           ` Dave Hansen
2016-12-07 18:38             ` [Qemu-devel] " Andrea Arcangeli
2016-12-07 18:44               ` Dave Hansen
2016-12-07 18:58                 ` Andrea Arcangeli
2016-12-07 19:54               ` Dave Hansen
2016-12-07 20:28                 ` Andrea Arcangeli
2016-12-09  4:45                   ` Li, Liang Z
2016-12-09  4:53                     ` Dave Hansen
2016-12-09  5:35                       ` Li, Liang Z
2016-12-09 16:42                         ` Andrea Arcangeli
2016-12-14  8:20                           ` Li, Liang Z
2016-12-14  8:59                       ` Li, Liang Z
2016-12-15 15:34                         ` Dave Hansen
2016-12-15 15:54                           ` Michael S. Tsirkin
2016-12-16  1:12                             ` Li, Liang Z
2016-12-16 15:40                               ` Andrea Arcangeli
2016-12-17 11:56                                 ` Li, Liang Z
2016-12-16  0:48                           ` Li, Liang Z
2016-12-16  1:09                             ` Dave Hansen
2016-12-16  1:38                               ` Li, Liang Z
2016-12-16  1:40                                 ` Dave Hansen
2016-12-16  1:43                                   ` Li, Liang Z
2016-12-16 16:01                                   ` Andrea Arcangeli
2016-12-17 12:39                                     ` Li, Liang Z

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